751521/751523 Current Sensor Unit User`s Manual - Electro
Contents
1. To enable the protection features check the following items before applying the voltage or current of the item under measurement Check that the power supply is connected using the power cable provided with the instrument and that the instrument is grounded Check that the power switch of the instrument is turned ON Check that the protective covers that came with the instrument for the input and output sections are attached Wire the conductive part of the cable connected to the primary current input terminal so that it does not protrude from the protective cover Although they are well insulated do not touch the instrument or any cables connected to the instrument when voltage is being applied to them When wiring to the sensor unit s primary current input terminal tighten the terminal screw to 20 30 N m torque If the tightening torque is too high damage to the terminal may result If the tightening torque is too low the contact resistance at the point where current is applied to the terminal will rise and heat will be produced which can cause a fire The terminal screw should be periodically retightened Ifthe current capacity of the cables connected to the primary current input terminal is small heating can occur when large currents flow Use a cable with sufficient current capacity and ensure that the temperature of the sensor unit s primary current input terminal is below 100 C Also ensure that the conductive part of2. 0 05 0 08 x f of reading 40 uA 40 kHz lt f lt 100 kHz 0 2 x f of reading 40 uA However the frequency of 1 kHz lt f is merely a reference value The units for the calculation of f are kHz Standard Conditions AC Input Sine wave 23 5 C 30 to 70 RH Input current 2 A to600 A Common mode voltage 0 V Power supply voltage 95 to 105 V for code 1 110 to 120 V for code 3 225 to 240 V for code 7 Test at a frequency of 60 Hz 50 Arms the other frequency band is 20 Arms Within 3 months after calibration Accuracy 12 Months after Calibration Frequency Band Temperature Coefficient Add the error in the reading value x 0 5 to the above accuracies DC to 100 kHz 3dB 0 01 C 10 to 18 C 28 to 40 C Continuous Maximum Allowable Input 600 A peak Limited as shown in figure 6 when the frequency of the input current exceeds 400 Hz However these are merely reference values Instantaneous Maximum Allowable Input 3000 A peak 0 1 sec or less reference value Continuous Maximum Common Mode Voltage Input Terminal Type Output Terminal Type Secondary Burden Resistance Operating Temperature Operating Humidity Storage Temperature Range Operating Altitude Rated Supply Voltage Permitted Supply Voltage Range Rated Supply Voltage Frequency IM751523 01E 7th Editon 2 2 600 Vrms M12 bolt nut Screw 90 Q or less However the burden resistance is limited by the inp
3. current input terminal of the instrument A current equivalent to the primary current rating may be output from the output terminal even when the applied current is stopped In that case turn the power switch OFF and then back ON again Then the instrument may return to normal once a current of the allowable input range is representative applied If it does not contact your dealer or nearest YOKOGAWA The input current is limited by the burden resistance connected to the instrument s secondary output as shown in figure 7 Avoid extremely strong external magnetic fields aside from the magnetic fields that occur due to the primary current of the item under measurement as they may cause measurement errors Depending on the suffix code some of the primary current input terminals on the rear panel of the model 751523 cannot be used for measurement for example Vin Vout Win and Wout For example 751523 20 would be a U W model so the primary current input terminals Vin and Vout could not be used for measurement 6 Specifications Input format Rated Current Output Current Input Output Ratio Accuracy Floating input CT input DC 0 to 600 A AC 600 A peak Primary rated current at 600 A is 400 mA 1500 1 DC 30 Hz lt f lt 45 Hz 45 Hz lt f lt 68 Hz 66 Hz lt f lt 1 kHz 0 05 of reading 40 uA 0 1 of reading 40 uA 0 05 of reading 40 uA 0 1 of reading 40 uA 1 kHz lt f lt 40 kHz
4. the cable does not protrude from the protective cover Do not input excessive current as malfunction or damage may result Do not carry the instrument by yourself The instrument should only be carried by two persons Firmly grasp the handles on the side of the case Model 751521 weighs 14 kg and model 751523 weighs 24 kg Take care to avoid injury while moving the instrument Always be sure to turn OFF the power switch and disconnect any cables such as power cables before moving the instrument 3 Installation Position e Desktop Place the instrument on a flat even surface as shown in the figure below If the instrument is installed in a horizontal position rubber feet can be attached to prevent slipping Two sets four pieces of rubber feet are included in the package 751523 751521 Figure Installation Position e Rack Mount To mount the instrument in a rack use the rack mount kit that is sold separately Product Model Rack Mount Kit for models 751521 751535 E5 Rack Mount Kit for models 751521 751535 J5 An outline of the attachment procedures is given below For details regarding the attachment procedures see the instructions that are included with the rack mount kit 1 Remove the handle on each side of the instrument 2 Remove the four feet on the bottom of the instrument 3 Remove the plastic rivet and the four seals covering the rack mount attachment holes on both side
5. x approx 221 H x approx 429 5 D mm 751523 Approx 426 W x approx 354 8 H x approx 429 5 D mm excluding the input terminal feet and other protrusions 751521 approx 14kg 751523 approx 24kg 751521 Approx 25 VA 751523 Approx 75 VA 1 10 100 1000 10000 100000 Frequency Hz Figure 6 Derating of the Input Current by Frequency Burden resistance Q 100 90 80 70 60 50 40 30 20 10 0 e 052 1 2 4 0 so 10015020 25030 350 400 450500 550 800 Input Current A Figure 7 Derating of the Input Current by Burden Resistance Reverse Units mm Figure 8 External Dimensions 751521 Reverse 7 Servicing Units mm Figure 9 External Dimensions 751523 If you encounter any problems during use or if the device does not appear to be operating normally contact your dealer or nearest YOKOGAWA representative 8 Warranty If you experience a breakdown in the device due to faulty manufacturing or accidents during shipping contact your dealer or nearest YOKOGAWA representative
6. User s 751521 751523 Manual Current Sensor Unit rn Thank you for purchasing the Current Sensor Unit Model 751521 751523 In order to take advantage of all the functions of the transducer and to ensure proper use please read this user s manual thoroughly before beginning operation This device is a current sensor with a 1500 1 current transformation ratio that performs transformation on the primary current Please familiarize yourself with the functions and characteristics of the instrument prior to operation 7th Edition May 2004 YK All Rights Reserved Copyright 2001 Yokogawa Electric Corporation YOKOGAWA IM 751523 01E 7th Edition 1 Checking the Contents of the Package Unpack the box and check the contents before operating the instrument If some items are missing or otherwise inconsistent with the contents description please contact your dealer or nearest YOKOGAWA representative Model Code Suffix Code Specifications 751521 600 A peak DC AC 1500 1 single phase sensor unit 751523 600 A peak DC AC 1500 1 three phase sensor unit 751523 codes 10 U V model 20 U W model 30 U V W model Supply Voltage 1 100 VAC 3 115 VAC 7 230 VAC Power Cord D UL CSA standard power cord Maximum rated voltage 125 V maximum rated current 7 A F VDE standard power cord Maximum rated voltage 250 V maximum rated current 10 A R AS standard power cord Maximum rated volt
7. age 250 V maximum rated current 10 A J BS standard power cord Maximum rated voltage 250 V maximum rated current 5 A H GB standard power cord complies with the CCC Maximum rated voltage 250 V maximum rated current 10 A Accessories User s manual 1 pc Power cord The type of power cord varies depending on the suffix code as folows D UL CSA standard power cord part no A1006WD 1 pc F VDE standard power cord part no A1009WD 1 pc R AS standard power cord part no A1024WD 1 pc J BS standard power cord part no A1023WD 1 pc H GB standard power cord part no A1064WD 1 pc Current secondary output cable twist pair cable 751521 part no B8200JB 1 pc 751523 10 part no B8200JA 2 pc 751523 20 part no B8200JA 2 pc 751523 30 part no B8200JA 3 pc Spare fuse for the power supply part no A1463EF 1 pc Rubber feet part no A9088ZM 2 sets 4 pcs Bolt part no Y9640RU 751521 4 pcs 751523 6 pcs Nut part no Y9121BU 751521 4 pcs 751523 6 pcs Washer part no Y9120WU 751521 4 pcs 751523 6 pcs Spring washer part no Y912OSU 751521 4 pcs 751523 6 pcs oe oo o A Improper handling or use can lead to injury to the user or damage to the instrument This symbol appears on the instrument to indicate that the user must refer to the user s manual for special instructions The same symbol appears in the corresponding place in the user s manua
8. l to identify those instructions In the manual the symbol is used in conjunction with the word WARNING or CAUTION Describes precautions that should be observed to prevent serious injury or death to the user CAUTION Describes precautions that should be observed to prevent minor or moderate injury or damage to the instrument Note Provides important information for the proper operation of the instrument WARNING Beware of electric shock Do not perform measurement if the case is damaged Do not operate the device with wet hands in a rainy or humid environment or if water droplets are present Condensation may appear if sudden changes in temperature occur If this happens let the device acclimatize to the new temperatures for at least one hour then refrain from using the device until confirming that there is no condensation Do Not Disassemble the Device The device should be disassembled by qualified personnel only Use the correct power supply Before connecting the power cord ensure that the power supply voltage matches the supply voltage for the instrument and that it is within the maximum rated voltage for the power cord itself e Wire the secondary current output terminal to the measuring instrument before supplying power to the unit Do not disconnect the secondary current output terminal while power is being supplied to the instrument Do not apply primary current before supplying power to the device
9. s of the instrument near the front 4 Place seals over the feet and handle attachment holes Attach the rack mount kit 6 Mount the instrument on the rack a Figure 2 Removing the Handles Note SSsSsSsSsSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSe e When rack mounting the instrument allow at least 20 mm of space around the vent holes to prevent internal overheating Make sure to have adequate support for the bottom of the instrument However do not block the vent holes in the process e No rack mount kit is available for the model 751523 4 Names of Parts Front Panel 751521 Secondary current output terminal Power plug Protective cover Primary current Primary current input terminal in input terminal out Pilot Lamp Power switch Secondary current output terminal Power plug Protective cover 751523 Primary current input terminal in Primary current Pilot Lam E input terminal out Power switch Figure3 Names of Parts 5 Operating Procedure CAUTION Ensure that the current flowing to the conductor of the object to be measured is within the rated current range If the rated current range is exceeded the device may overheat and become damaged Oo a 1 Connect the instrument s secondary current output terminal to the current input terminal on the measuring instrument power meter and connect the power supply 2 Setup
10. the measuring instrument to match the specifications of the current transducer Carefully read the relevant user s manuals to obtain the correct procedure to make the connections 3 Wire the instrument s primary current input terminal to the measurement circuit IM751523 01E 7th Editon 1 2 Figures 4 and 5 provide a wiring example Carefully read the user s manuals for the power meter you are using to obtain the correct procedure to make the connections B8200JA twist pair cable O Cable terminal 751521 Ri B8200JB twist pair cable E Cable terminal 2 Cable terminal Power meter B8200JA twist pair cable 751523 30 A short circuit wire is not provided as an accessory Please supply your own wire Figure 4 An Example of Wiring a Power Meter to the Sensor Unit Primary current input terminal out Primary current input terminal in Battery Primary current input terminal in Primary current input terminal out P N Inverter Three phase sensor unit Figure 5 An Example of Wiring a Measurement Circuit 4 Apply the primary current 5 Read in the measured values The following calculation is used to determine the current flowing through the primary conductor Example Given a current output terminal 100 mA x Note of 100 mA being output from the instrument s secondary current 1500 150 A e Never apply a current exceeding the allowable input range to the
11. ut current as shown in figure 7 10 to 40 C 20 to 80 RH no condensation allowed 0 to 60 C 2 000 m or lower 100 VAC for code 1 115 VAC for code 3 230 VAC for code 7 90 to 110 V for code 1 105 to 125 V for code 3 220 to 250 V for code 7 50 Hz 60 Hz Permitted Supply Voltage Frequency Range Warmup Time Insulation Resistance Withstanding Voltage External Dimensions Weight Power Consumption Maximum allowable input current Arms 1000 100 10 48 Hz to 63 Hz Approximately 30 minutes 50 MQ or more at 500 VDC Across all input terminals together and the case Across all input terminals together and the power plug Across all input terminals together and all output terminals together Across the case and the power plug Across all output terminals together and the power plug Across each input terminal Note the I secondary current output terminal and are shorted AC 2200 V for one minute at 50 60 Hz Across all input terminals together and the case Across all input terminals together and all output terminals together Across each input terminal Across all terminals together and the power plug Note the I secondary current output terminal and are shorted AC 1500 V at 50 60 Hz for one minute Across the case and the power plug Across all output terminals together and the power plug Note the I secondary current output terminal and are shorted 751521 Approx 426 W
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