Tenma 72-7570 (CPX400A) Instruction Manual
Contents
1. 72 7570 DUAL 60V 20A POWER FLEX POWER SUPPLY INSTRUCTION MANUAL Tenma 72 7570 Instruction manual Specification Safety EMC Installation Connections Operation Maintenance Table of Contents Specification General specifications apply for the temperature range 5 C to 40 C Accuracy specifications apply for the temperature range 18 C to 28 C after 1 hour warm up with no load and calibration at 23 C Typical specifications are determined by design and are not guaranteed OUTPUT SPECIFICATIONS Voltage Range Current Range Power Range Output Voltage Setting Output Current Setting Operating Mode OV to 60V OA to 20A Up to 420W By coarse and fine controls By single logarithmic control Constant voltage or constant current with automatic cross over provided that the power demanded stays within the power envelope see graph Outside of this envelope the output becomes unregulated 60V Volts 20V 72 7570 POWER ENVELOPE oV 7A Amps 20A www tenma com 1 Tenma 72 7570 Instruction manual Output Switch Output Terminals Sensing Output Protection Over temperature Protection OVP Range Line Regulation Load Regulation Ripple amp Noise 20MHz bandwidth Transient Load Response Temperature Coefficient Status Indication METER SPECIFICATIONS Meter Types Meter Resolutions Meter Accuracies GENERAL AC Input Power Consumption Operating2. 00m Pollution Degree 2 Complies with EN61010 1 Complies with EN61326 210 x 130 x 375mm WxHxD half rack width x 3U height optional rack mounting kit available 6kg www tenma com Tenma 72 7570 Instruction manual Safety This power supply is a Safety Class instrument according to IEC classification and has been designed to meet the requirements of EN61010 1 Safety Requirements for Electrical Equipment for Measurement Control and Laboratory Use It is an Installation Category II instrument intended for operation from a normal single phase supply This instrument has been tested in accordance with EN61010 1 and has been supplied in a safe condition This instruction manual contains some information and warnings which have to be followed by the user to ensure safe operation and to retain the instrument in a safe condition This instrument has been designed for indoor use in a Pollution Degree 2 environment in the temperature range 5 C to 40 C 20 80 RH non condensing It may occasionally be subjected to temperatures between 5 C and 10 C without degradation of its safety Do not operate while condensation is present Use of this instrument in a manner not specified by these instructions may impair the safety protection provided Do not operate the instrument outside its rated supply voltages or environmental range WARNING THIS INSTRUMENT MUST BE EARTHED Any interruption of the mains earth conductor inside or
3. Range Storage Range Environmental Safety EMC Size Weight Electronic Preset voltage and current displayed when off Universal 4mm safety binding posts on 19mm 0 75 pitch 30A max Switchable between local and remote Spring loaded push terminals for remote connection Forward protection by Over Voltage Protection OVP trip maximum voltage that should be applied to the terminals is 70V Reverse protection by diode clamp for reverse currents up to 3A The output will be tripped off if a fault causes the internal temperature to rise excessively 10 to 110 of maximum output voltage set by front panel screwdriver adjustment Change in output for a 10 line change lt 0 01 of maximum output Change in output for any load change within PowerFlex envelope remote sense connected lt 0 05 of maximum output 4mVrms max typically lt 2mVrms lt 10mV pk pk at maximum load CV mode lt 250us to within 50mV of set level for a 5 to 95 load change Typically lt 100ppm C Output on lamp Constant voltage mode lamp Constant current mode lamp Unregulated power limit lamp Trip message on display Dual 4 digit meters with 12 5mm 0 5 LEDs Reading rate 4 Hz 10mV 10mA Voltage 0 1 of reading 2 digits Current 0 3 of reading 2 digits 110V 240V AC 10 50 60Hz Installation Category Il 1250VA max 5 C to 40 C 20 to 80 RH 40 C to 70 C Indoor use at altitudes up to 20
4. The maximum output at different voltage settings is limited by the power envelope illustrated below oyy 72 7570 POWER ENVELOPE Volts 20V oV 7A Amps 20A 6 www tenma com Tenma 72 7570 Instruction manual The power envelope is set to give 62V 7A 42V 10A and 20V 20A under all supply conditions both outputs loaded at lower output voltages the output power is restricted by the 20A current maximum When the power limit is exceeded the status indication will change from CV or Cl to UNREG For example if the supply is set to 20V with the current limit at maximum and is connected to a 20 load 10 Amps will flow and the supply will be in CV mode As the voltage across the load is increased the power into the load increases until at about 29V the power limit is exceeded and the supply changes from CV to UNREG Connection to the Load The load should be connected to the positive red and negative black OUTPUT terminals Both are fully floating and either can be connected to ground Remote Sensing The unit has a very low output impedance but this is inevitably increased by the resistance of the connecting leads At high currents this can result in significant differences between the indicated source voltage and the actual load voltage two 5mQ connecting leads will drop 0 2V at 20 Amps for instance This problem can be minimised by using short thick connecting leads but where necessary it can be completely overcome by using the
5. e the fuse first disconnect the instrument from the AC supply Remove the 6 cover securing screws and lift off the cover Replace the fuse with one of the correct type and refit the cover Note that the main function of the fuse is to make the instrument safe and limit damage in the event of failure of one of the switching devices If a fuse fails it is therefore very likely that the replacement will also blow because the supply has developed a fault in such circumstances the instrument will need to be returned to the manufacturer for service Cleaning If the PSU requires cleaning use a cloth that is only lightly dampened with water or a mild detergent Polish the display window with a soft dry cloth WARNING TO AVOID ELECTRIC SHOCK OR DAMAGE TO THE PSU NEVER ALLOW WATER TO GET INSIDE THE CASE TO AVOID DAMAGE TO THE CASE OR DISPLAY WINDOW NEVER CLEAN WITH SOLVENTS 8 www tenma com TENMA TEST EQUIPMENT 405 Pioneer Blvd Springboro Ohio 45066 Book Part No 48511 0820 Issue 3
6. eral units are connected in parallel the output voltage will be equal to that of the unit with the highest output voltage setting until the current drawn exceeds its current limit setting upon which the output will fall to that of the next highest setting and so on In constant current mode units can be connected in parallel to provide a current equal to the sum of the current limit settings Note that the output terminals are rated at 30A maximum if two or more outputs are operated in parallel to source higher currents than this the junction should be made at a separate point not one of the terminals Protection Overvoltage protection OVP is fully variable within the range 10 to 110 of the supply s maximum output level The OVP limit is set via the screwdriver adjustable SET OVP preset potentiometer accessible through a hole in the front panel Rotating the preset clockwise increases the limit which can be read directly on the user display by pressing the button beneath the preset If the voltage on the output exceeds the set OVP for any reason including an externally forced voltage the output will be tripped off The output will also be tripped off if an attempt is made to draw power from the sense wires www tenma com 7 Tenma 72 7570 Instruction manual When the output is tripped the OUTPUT lamp will still be ON but the displays will show OP trip and the UNREG lamp will also light Turn the output off the trip message sh
7. n be accurately preset using the VOLTAGE and CURRENT controls the upper meter shows the set voltage and the lower meter shows the set maximum current When the OUTPUT switch is switched on the OUTPUT ON lamp and the CV constant voltage lamp light the upper meter continues to show the set voltage but the lower meter now shows the actual load current Constant Voltage The output voltage is adjusted using the coarse and fine VOLTAGE control the CURRENT control sets the maximum current that can be supplied The CV lamp lights to show constant voltage mode Constant Current If the load resistance is low enough such that at the output voltage set a current greater than the current limit setting would flow the power supply will automatically move into constant current operation The current output is adjusted by the CURRENT control and the VOLTAGE controls set the maximum voltage that can be generated The Cl lamp lights to show constant current mode Instantaneous Current Output The current limit control can be set to limit the continuous output current to levels down to 10mA However in common with all precision bench power supplies a capacitor is connected across the output to maintain stability and good transient response This capacitor charges to the output voltage and short circuiting of the output will produce a current pulse as the capacitor discharges which is independent of the current limit setting Power Limit
8. ne 1kV line to ground Performance B B f EN61000 4 6 2007 Conducted RF 3V 80 AM at 1kHz AC line only DC Output connections lt 3m therefore not tested Performance A A According to EN61326 1 the definitions of performance criteria are Performance criterion A During test normal performance within the specification limits Performance criterion B During test temporary degradation or loss of function or performance which is self recovering Performance criterion C During test temporary degradation or loss of function or performance which requires operator intervention or system reset occurs Where Performance B is stated it is because DC Output regulation or V amp measurement accuracy may deviate beyond Specification limits under the test conditions However the possible deviations are still small and unlikely to be a problem in practice Note that if operation in a high RF field is unavoidable it is good practice to connect the PSU to the target system using screened leads which have been passed together through an absorbing ferrite sleeve fitted close to the PSU terminals Cautions To ensure continued compliance with the EMC directive observe the following precautions a after opening the case for any reason ensure that all signal and ground connections are remade correctly and that case screws are correctly refitted and tightened b In the event of part replacement becoming necessary
9. nting The front feet include a tilt mechanism for optimal panel angle A rack kit for mounting one or two of these Half width 3U high units in a 19 rack is available from the Manufacturers or their overseas agents Connections All connections are made from the front panel The load should be connected to the positive red and negative black terminals marked OUTPUT The OUTPUT terminals are rated at 30A Remote sense connections to the load if required are made from the positive and negative SENSE terminals Switch the LOCAL REMOTE switch to REMOTE when remote sensing is required Switch back to LOCAL when remote sensing is not in use The terminal marked is connected to the chassis and safety earth ground www tenma com 5 Tenma 72 7570 Instruction manual Operation The operation of both outputs is identical the following description applies to both Switching On The power switch located at the bottom left of the front panel switches between standby dy and on 1 In standby the auxiliary power circuit remains connected and consumes 6 Watts To fully disconnect from the AC supply unplug the mains cord from the back of the instrument or switch off at the AC supply outlet make sure that the means of disconnection is readily accessible Disconnect from the AC supply when not in use Setting Up the Output With the POWER switch on 1 and the OUTPUT switch off the output voltage and current limit ca
10. on the instrument and in this manual Earth ground terminal O Instrument in STAND BY l mains supply ON NZ alternating current ac www tenma com 3 Tenma 72 7570 Instruction manual EMC This instrument has been designed to meet the requirements of the EMC Directive 2004 108 EC Compliance was demonstrated by meeting the test limits of the following standards Emissions EN61326 1 2006 EMC product standard for Electrical Equipment for Measurement Control and Laboratory Use Test limits used were a Radiated Class B b Conducted Class B c Harmonics EN61000 3 2 2000 Class A the instrument is Class A by product category Immunity EN61326 1 2006 EMC product standard for Electrical Equipment for Measurement Control and Laboratory Use Test methods limits and performance achieved are shown below requirement shown in brackets a EN61000 4 2 1995 Electrostatic Discharge 4kV air 4kV contact Performance A B b EN61000 4 3 2006 Electromagnetic Field 3V m 80 AM at 1KHz 80MHz 1GHz Performance A A and 1 4GHz to 2GHz Performance A A 1V m 2 0GHz to 2 7GHz Performance A A c EN61000 4 11 2004 Voltage Interrupt 2 cycle 0 Peformance A B 1 cycle 0 Performance B B 25 cycles 70 Performance A C 250 cycles 0 Performance B C d EN61000 4 4 2004 Fast Transient 1kV peak AC line 0 5kV peak DC Outputs Performance B B e EN61000 4 5 2006 Surge 0 5kV line to li
11. only use components of an identical type see the Service Manual 4 www tenma com Tenma 72 7570 Instruction manual Installation Mains Operating Voltage This instrument has a universal input range and will operate from a nominal 115V or 230V mains supply without adjustment Check that the local supply meets the AC Input requirement given in the Specification Mains Lead Connect the instrument to the AC supply using the mains lead provided Should a mains plug be required for a different mains outlet socket a suitably rated and approved mains lead set should be used which is fitted with the required wall plug and an IEC60320 C13 connector for the instrument end To determine the minimum current rating of the lead set for the intended AC supply refer to the power rating information on the equipment or in the Specification WARNING THIS INSTRUMENT MUST BE EARTHED Any interruption of the mains earth conductor inside or outside the instrument will make the instrument dangerous Intentional interruption is prohibited Ventilation The power supply is cooled by an intelligent multi speed fan which vents at the rear Take care not to restrict the air inlets at top bottom and side panels or the exit at the rear In rack mounted situations allow adequate space around the instrument and or use a fan tray for forced cooling Mounting This instrument is suitable both for bench use and rack mounting It is delivered with feet for bench mou
12. ould be replaced with the normal preset V and readings When the cause of the trip has been removed the output can be switched on again Even with the output off the load is still connected to the power supply output stage Do not apply external voltages in excess of 70V to the power supply terminals or damage may result The output is protected from reverse voltages by a diode the continuous reverse current must not exceed 3 Amps although transients can be much higher Over temperature Protection Sensors on both the secondary heatsinks will detect over temperature due to blocked air flow fan failure or other circuit fault Over temperature will shut down the output the display will read 0 Volts and 0 Amps if the output is ON though the output ON lamp will remain lit The output will remain shut down even after the heatsinks have cooled down When the cause of the over temperature has been removed and the heatsinks have cooled to normal working temperatures the output can be reset by turning the POWER switch to stand by d then on 1 again Maintenance For service repair and calibration please contact your local Tenma distributor or go to www tenma com Fuse The correct fuse type for this instrument is 15 Amp 250V HBC time lag 17 x Va Make sure that only fuses of the required rated current and specified type are used for replacement The use of makeshift fuses and the short circuiting of fuse holders is prohibited To replac
13. outside the instrument will make the instrument dangerous Intentional interruption is prohibited The protective action must not be negated by the use of an extension cord without a protective conductor When the instrument is connected to its supply terminals may be live and opening the covers or removal of parts except those to which access can be gained by hand is likely to expose live parts The apparatus shall be disconnected from all voltage sources before it is opened for any adjustment replacement maintenance or repair Capacitors inside the power supply may still be charged even if the power supply has been disconnected from all voltage sources but will be safely discharged about 10 minutes after switching off power Any adjustment maintenance and repair of the opened instrument under voltage shall be avoided as far as possible and if inevitable shall be carried out only by a skilled person who is aware of the hazard involved If the instrument is clearly defective has been subject to mechanical damage excessive moisture or chemical corrosion the safety protection may be impaired and the apparatus should be withdrawn from use and returned for checking and repair Make sure that only fuses with the required rated current and of the specified type are used for replacement The use of makeshift fuses and the short circuiting of fuse holders is prohibited Do not wet the instrument when cleaning it The following symbols are used
14. remote sense facility This requires the sense terminals to be connected to the output at the load instead of at the source insert wires into the spring loaded SENSE terminals and connect directly to the load Switch the LOCAL REMOTE switch to REMOTE To avoid instability and transient response problems care must be taken to ensure good coupling between each output and sense lead This can be done either by twisting the leads together or by using coaxially screened cable sense through the inner An electrolytic capacitor directly across the load connection point may also be beneficial The voltage drop in each output lead must not exceed 0 5 Volts Switch the LOCAL REMOTE switch back to LOCAL when remote sensing is not in use Series or Parallel connection with other units The outputs of the power supply are fully floating and may be used in series with other power supply units to generate high DC voltages up to 300V DC WARNING Such voltages are exceedingly hazardous and great care should be taken to shield the output terminals for such use On no account should the output terminals be touched when the unit is switched on under such use All connections to the terminals must be made with the power switched off on all units It should be noted that the unit can only source current and cannot sink it thus units cannot be series connected in anti phase The unit can be connected in parallel with others to produce higher currents Where sev
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