ubz-301 (5-50a)
Contents
1. unit is designed for the continuous monitoring of the mains voltage parameters and for RMS phase line currents of 3 Phase AC 380V 50Hz electrical equipment monitoring primarily of induction motors whose power is from 2 5 kW up to 25 kW isolated neutral system included The unit provides full and effective protection of electrical equipment by a magnetic starter contactor coil control The unit isolates electrical equipment from the running system and or disables its start This is performed in the following cases 1 when the mains voltage is of poor quality unallowable voltage jumps phase loss incorrect phase sequence and phase coincidence phase line voltage imbalance 2 when mechanical overloads symmetrical phase line current overload take place The unit performs overload protection with a dependent time delay 3 when phase line current asymmetrical overloads induced by faults inside the motor occur The unit performs protection from phase current imbalance and further disables an automatic reset 4 when phase current asymmetry without overload occurs that is induced by the insulation fault inside the motor and or the power cable 5 when motor load is lost dry stroke for pumps The unit provides the minimum start and or operating current protection 6 when insulation level to frame is abnormally low The unit performs insulation level test before start and if the insulation is poor the start is disabled 7 when sta2. BO 01 is absent the 10 11 12 terminals are not used 7 STORAGE AND SHIPPING CONDITIONS The unit in manufacturer package should be stored in enclosed rooms at 45 to 70 C and exposed to no more than 80 of relative humidity when there are no fumes in the air that exert a deleterious effect on package and the unit material The Buyer must provide the protection of the unit against mechanical damages in transit 8 WARRANTY Novatek Electro LTD Company warrants a trouble free operation of the UBZ 301 5 50A unit manufactured by it within 36 months from the date of sale provided e the proper installation e the safety of the inspection quality control department seal e the integrity of the case no traces of an opening cracks spalls etc
3. NOVATEK ELECTRO LTD NOVATEK Research and Manufacture Company Electro o wistseee e 6 On Insulation Overload U Fault E 6 A i 1 115 15 10 aoa SEAR eho UBZ 301 5 50A UNIVERSAL INDUCTION MOTOR PROTECTION UNIT 1 wm 15 K X i j O 2 O Unom PI 4inom Ton sec X1 X2 X3 Tin 14 172m 16 ATTH 18 eeee a es 40 11 12 13 THe 15 TT2x 17 ATT m SERVICE MANUAL CONTROLS DESCRIPTION AND DIMENSIONS DIAGRAM 5 Sy yw mins e bee Unom Pi inom Ton sec xt X2 X3 Trin 14 tram 16 pris 18 oeeevee eee 10 11 12 13 rr 15 tr 17 Arex Control for nominal current setting Inom Control for operating current setting lop Inom Control for T2 double overload trip delay setting Combined trip adjustment control for Umin Umax Control for phase imbalance adjustment PI Control for trip threshold for the minimum current Imin Y Inom Control for automatic reset delay setting Ton Green LED indicating for the mains voltage presence 9 10 11 Red LEDs indicating faults for insulation overload and U fault respectively 12 Green LED indicating for load energization 13 Output terminals 14 Input terminals 10 11 12 are used for the connection with the BO 01 exchange unit 15 Insulation monitoring terminal CONDoaABRWDND www novatek electro com 1 APPLICATIONS The UBZ 301 5 50A universal induction motor protection
4. ad is de energized all red LEDs glow the unit is disabled the automatic reset is forbidden To enable the unit one needs to remove supply voltage from the unit It s supposed that this type of fault is induced by abnormal conditions inside the motor e current imbalance set by Ne5 potentiometer is less than twice exceeds voltage imbalance the load is de energized the red U Fault LED glows the automatic reset is permitted e current imbalance set by Ne5 potentiometer is less than voltage imbalance the load is de energized the red U Fault LED blinks the automatic reset is permitted e the average current value is less than Imin set by Ne6 potentiometer the load is de energized all red LEDs blink simultaneously the unit is disabled the automatic reset is forbidden To enable the unit one needs to remove the supply voltage from the unit Electromotor protection against heat overload The electromotor heat balance equation is being solved as the work advances It s supposed that e the motor was cold before start e during operation the motor releases the heat which is proportional to the current square e after the stop the motor cools down exponentially Below is the current time characteristic curve with different T2 values set by Ne3 potentiometer where e In current ratio relative to the nominal current e T T2 actual trip delay relative to T2 set by Ne 3 potentiometer Current time characteristic dependenc
5. al device that provides a high degree of reliability and accuracy The unit doesn t need any auxiliary supply because it retrieves it s energy demand out of the measurement signal it s self powered by the voltage to be monitored Simultaneous isolated independent monitoring for the mains voltage and phase currents permits to detect the type of occurring fault and to provide a different decision making logic for each fault type When the mains voltage faults occur the unit performs automatic load reset on return voltage parameters to normal operating conditions If a fault is induced by abnormal condition inside the motor phase current imbalance at the symmetrical mains voltage leakage current presence etc restart is disabled The unit is stocked with three toroidal current transducers Two of them are the phase line current transducers TT1 TT2 power phase cables are pulled through them The third transducer is the differential current transducer DCT that has an enlarged diameter because three power phase cables are pulled through it By the 6 7 8 9 terminals the unit is connected in parallel to the mains supply to be monitored The unit output is provided with N O and N C contacts the 1 2 3 4 terminals The output 3 4 terminals are connected in series with the starter coil power supply with control circuit The 5 terminal is designed to monitor the insulation level The unit wiring diagram is shown below When the unit trips the l
6. ality i e if voltage is present on all three phases if the mains voltage is symmetrical what the RMS line voltage value is like When any of inhibit factors is present the load is not energized the red U Fault LED blinks e a correct phase sequence and phase non coincidence When any of inhibit factors is present the load is not energized all red LEDs are blinking in turn If all the parameters are normal the outlet relay will be energized after Ton delay has expired the 3 4 contacts are being closed and the 1 2 contacts are being opened the green Load LED glows If load currents are absent there are no less 2 of nominal one the reason is that the load is de energized Voltage monitoring and insulation level is going Output relay of unit is de energized if inhibit factors are present in pause without currents 2 After the load is energized the unit performs voltage and current monitoring The decision on load de energization is made according to the following factors e RMS current exceeds the nominal operating current set by NeNe 1 2 3 potentiometers if there is current overload without heat overload the red Overload LED blinks but the load is not de energized If current overload induces heat overload the load is de energized The red Overload LED glows and is ON during 0 9Ton The automatic reset is permitted e current imbalance set by Ned potentiometer is twice exceeds the mains voltage imbalance the lo
7. e s TsT2 6 The current time characteristic dependence shown in the tables below is given for the standard recommended T2 value the N23 potentiometer middle position corresponds to 60 seconds when double overload occurs Mnom 11 12 14 te 2 forte tat ft 8 7 ft et tof ts Tsec 13 5 8 5 5 9 43 33 21 09 After the load has been de energized owing to the heat overload it will automatically be energized again e according to heat hysteresis if time delay Ton 0 i e the motor must cool down 33 of the stored up heat e according time delay Ton Ne 7 potentiometer if Ton isn t equal 0 By suitable selection of different Ton values heat hysteresis considered one can reduce number of starts per time unit because in the intermittent cycle the unit stores heat quantity released at the start of the motor 6 PRELIMINARY STARTING PROCEDURE AND SERVICE MANUAL The unit produced is completely ready for operation and needs no special pre starting procedure measures Owing to digital technology all the unit settings are aligned quite accurate so no control devices are needed to adjust them Use of the unit according to specifications above and the present service manual continuous work included relieves of preventive maintenance during service life To put the unit in operation one must follow operating instructions given below 1 To set nominal operating current trip thresholds trip delays and reset delay by potentiomet
8. er s contact arms 2 To connect the unit according to the wire diagram given below e by the 6 L1 7 L2 8 L3 9 N terminals the unit is connected in parallel to the mains supply to be monitored e two current transducers each one of them is put on two power phase wires that carry the load are connected to the 13 14 15 16 terminals in connecting one has to consider the transducers grading 1 transducer the beginning the 13 terminal the end the 14 terminal 2 transducer the beginning the 15 terminal the end the 15 terminal e a differential current transducer that is put on the three power phase wires must be connected to the 17 18 terminals the connection grading is unimportant e the 5 insulation monitoring terminal is connected to one of the MS output contacts e output contacts the 3 4 terminals are connected to the MS coil power supply circuit control circuit e the BO 01 exhange and date transfer unit is connected to the 10 11 12 terminals this unit is supplied on order 3 To apply a voltage to the unit The correct setting of nominal current is checked by the number of blinks that the green LED makes After Ton has expired if there are no factors that can forbid energizing the output relay of the unit is energized If Ton 0 the first energizing will occur after 2 3 sec delay has expired NOTE The unit must be connected subject to the safety regulations To set settings is recommended in
9. eter Nom Green LED On blink No1 devisions current A COAN 1bl pause 2bl pause 8 3bl pause 10 4bl pause 2 2 4 6bl pause 7bl pause 5bl pause 7 z 9bl pause 10bl pause 50 11bl pause 10 3 10 8bl pause 50 NOTES 1 Continuous green On LED glow means that the potentiometer is set in dead band One needs to set the potentiometer so as the green LED blinked and the number of blinks corresponded to the set nominal current 2 Nominal currents setting is to be performed correcting for load connections Wye Delta according to ratings of engine Controls and adjustments The unit has seven independent controls For users convenience screwdriver slots of adjusting potentiometers are brought out to the unit front panel e N21 Inom nominal current setting there are eleven positions and each position corresponds to the specific current from the nominal currents table e No2 lop operating current it is set in 15 percent of nominal current it has ten scale marks e N23 T2 overload trip delay when there is double overload for operating current set in the central position T2 58 60 seconds The minimum time delay is 10 seconds the maximum time delay is 100 seconds The control shifts current time characteristic dependence along time axis e No4 Unom combined control for Umax Umin threshold in percent of the nominal voltage according to th
10. is setting before the load energization the unit is checking the mains voltage level and depending on its value permits or forbids the load energization after the load has been energized the voltage monitoring is going on but the load de energization decision is made for currents e No5 P1 trip threshold control for line voltage imbalance and RMS phase current imbalance it has ten scale marks The parameter is calculated as the difference between the maximum and the minimum values in percent of the maximum value If current imbalance percentage is twice as much as voltage imbalance percentage then it s supposed that the imbalance is induced by fault conditions inside the motor The automatic reset is forbidden and the unit is disabled 4 e No6 Imin trip threshold control for the minimum operating current in percent of operating current set It has ten scale marks from 0 to 75 in O position this control is off e No7 Ton automatic reset delay it is within 0 600 seconds range the scale is logarithmic Indication e the green ON LED indicates that voltage exists in the mains In the blink mode of glow the blink number between pauses corresponds to the specific nominal current from the nominal current table there is a continuous glow in a dead band One needs to set a nominal current in the blink mode of operation e the green Load LED indicates that the load is energized the 3 4 terminals a
11. oad is de energized by a break in the magnetic starter coil power circuit through the N C 3 4 contacts Pree Table 1 The 1 2 3 4 output contacts specification Max current A X Max sustained safe Max current for 250VA C voltage U 30V D C Cosp 0 4 TRS ROON Nominal parameters and trip thresholds are set by front panel screwdriver potentiometers Nominal current setting Nominal current is set by Ne 1 potentiometer There are eleven positions of the potentiometer Each position corresponds to the specific standard nominal current scale value see below Table of Nominal Currents Each position is characterized by the specific number of blinks that the green On LED makes To set the nominal current one needs to bring out potentiometer control arm to a corresponding position when the unit is energized the number of blinks On LED must correspond to the Table below One needs to take into account that there are dead bands between the positions where On LED glows without blinks and where the nominal current is indefinite In order to set operating value which is different from the nominal one that is specified in the nominal current table it s recommended the Ne 1 potentiometer to set to the position corresponding to the nearest value from the nominal current scale and by the Ne 2 potentiometer one can increase or decrease the necessary value in from the set value Table 2 Nominal current table Potentiom
12. off state To set settings alive is permitted in the test conditions subject to the safety regulations ATTENTION f immediately after the load has been energized the unit de energizes it and disables it for current imbalance the incorrect polarity of the current transducers TT1 or TT2 connection may be a reason Then it s recommended to change one of the transducers connection by reversing the places the beginning the end of the 13 16 terminals If the effect pointed above repeats when the load is re energized it means that the transducers were connected correctly and the imbalance arose from EM and or power cable fault NOTES 1 Transducers are mounted by plastic clamps they are component parts of supplies 2 The phase wires which are passing through the differential transducer to try to symmetrize in the center of the transducer ETs WIRING DIAGRAM UBZ 301 BO 01 OUTPUT CURRENT TRANSFORMERS 101112 13 14 15 16 17 18 optionaL S485 Computer BO 01 OR EXTENSION UNIT gg SCADASYSTEM DT differential current transducer differential current transformer CT1 CT2 current transducers BO 01 exchange and date transfer unit on order NOTE 1 START button and STOP button can be connected to MSC power supply circuit if necessary 2 The 220V MSC connection is shown here The 380V MSC power supply circuit is analogous coil power is applied from different phases through the 3 4 contacts 3 If
13. re closed e the red Insulation LED lights up with continuous glow before the start if the stator power cable winding insulation level is abnormally low less than 500 kOhms and also during operation when there is a tripping for differential current the unit is disabled e the red U Fault LED glows when the mains voltage fault has occurred The blink mode of operation switches on when there is undervoltage overvoltage phase imbalance for the mains voltage voltage is not present on all three phases e incorrect phase sequence or phase coincidence induces the mode of operation when all three red LEDs are blinking in turn e the red Overload LED blinks when the average phase current exceeds the nominal one After the unit has tripped for overload this LED comes to glow during 0 9 AR automatic reset delay 4 TECHNICAL BRIEF 5 5 According to current time Trip delay for current overload oy characteristic curve Output contact life under 5A load operations no less than 100 000 under 1A load operations no less than 1 000 000 Enclosure apparatus IP40 terminal block IP20 Mounting position arbitrary 5 5 OPERATION 1 After supply voltage has been applied to the unit and before the output relay is energized the unit checks e a Stator winding insulation level to frame If insulation resistance is below 500 20 kOhms the load is not energized The red Insulation LED glows e the mains voltage qu
14. tor winding ground to fault occurs during operation The unit performs the ground leakage current protection The UBZ 301 5 50A provides e a simple and accurate electromotor nominal current setting by nominal current standard scale e the electromotor operating current setting that differs from standard values e overload tripping with a dependent time delay the current time characteristic curve is plotted for a conventionally cold motor The motor heat balance differential equation is being solved in the operation process This approach enables to take account of the preceding electromotor status and to make a decision on heat overload presence with the maximum validity This method also permits to allow for a motor start heating and to restrict at the customer s option amount of starts per unit time e shift of current time characteristic curve along the current axis and along time axis as well e setting of trip thresholds for the minimum the maximum voltage line voltage amp phase current imbalance and also for automatic reset delay at the personal customer s discretion e fault type indication the mains voltage presence indication current range indication the unit is adjusted to and load energization indication e the data exchange and transfer to the local computer network according to the RS 485 MODBUS record through the BO 01 exchange unit BO 01 is supplied on order 2 DESCRIPTION The unit is a microprocessor based digit
Download Pdf Manuals
Related Search