NOVATEK-ELECTRO LTD Research-and-Manufacture Company ELECRTIC MOTORS UNIVERSAL PROTECTION DEVICE UBZ-302 SERVICE MANUAL www.novatek-electro.
-2- 1. GENERAL DESCRIPTION AND OPERATION 1.1 APPLICATION UBZ-302 is the microprocessor based digital device, reliable and of highest degree of measurement accuracy. It doesn’t require the operational external power supply since the controlled voltage at the same time is the power supply for UBZ-302. It has 3 built-in current measurement transformers through which the motor power supply wires are looped for continuous currents monitoring.
-3- Table 1.2 -Functional relay Cos ϕ = 0,4 Cos ϕ = 1,0 Maximal current Commutation lifetime х1000 at U~250V 5A 100 16 A 100 Maximal power Maximal long lasting Maximal current at for commutation withstand AC voltage Uconst=30V(commut.) 4000 VA 440/300 V 3A 1.1.3 Restrictions for the UBZ-302 application and the selection of the parameters 1.1.3.1 The use of built-in current transformers. It’s prohibited to use the UBZ-302 for the protection of the motors with rated power more than 20 kW.
-4- input for the connection of the differential current transformer Basic outputs: Power load relay – 2 groups of changeover contacts to operate with the motor starting contactor - 5A 250V at cosφ=1; Functional relay – one group of changeover contacts 16A 250V at cosφ=1 (the application of this relay contact is user defined); 1 Temperature sensors measurement accuracy, °С.
-5- PC connected to one of UBZ interfaces (MODBUS, RS-232) Measurements Range Accuracy Voltage Acting value of phase voltage (measured when the neutral wire is connected to the UBZ-302), V Acting value of line voltage, V Positive sequence voltage, V Reverse sequence voltage, V Zero sequence voltage (vector sum of 3 phase voltages divided by 3), (calculated when neutral wire connected to the UBZ-302), V Others Temperature of the Sensor 1 (type of the sensor is defined according the table 1.6.
Cos of the angle between voltage and current on Phase C*1000 This parameter is read-only for the interface RS-232, RS-485 -65% 0-1000 145,146 * NOTICE. If the temperature value exceed the mentioned limits – then on the indicator will be displayed the alarm code according to the Table 2.6; ** NOTICE. If the autoreclosing is prohibited by the user – then on display will be glowing sing “not”; *** NOTICE.
Default and readable Codes of parameters parameters Min value Max Value -7Default factory setting ding on thermal overload protection 0,3 5,0 0,5 i_t ñ 0,1 2,0 1,0 i_r 0 2 2 0- protection is disabled 1- protection enabled but autoreclosing after the fault is prohibited 2- protection enabled and autoreclosing is allowed 161 20 10 Is being set in the % of rated motor current value 162 10,0 2 5,0 2 Reverse current sequence protection Tripping threshold, % ioS 5 Tripping time delay,sec i
Default and readable Codes of parameters parameters Min value Max Value -8Default factory setting Action Address sing after the fault is prohibited 2- protection enabled and autoreclosing is allowed Long lasting (Overcrank) motor start, blocked rotor fault Tripping threshold to 1,5 7,0 5,0 PPS current, multiplicity coefficient Tripping time delay for PPt 1 600 10 the protection from long lasting start of the motor, sec Tripping time delay in 0,1 300 1.
Default and readable Codes of parameters parameters -9Default factory setting 1 Min value Max Value Arr 0 1 Permission of motor start after the power supply is given to the input terminals of UBZ-302 APd 0 2 1 Motor operation using the UBZ-302 ACd 0 3 0 2 0 100 80 9 0 3 0 220 180 196 220 170 197 9 0 198 2 1 1 0 ON/OFF mode for all type of faults Temperature control and monitoring ON/OFF mode for the —1r 0 temperature control function and setting the type of the Sensor
Default and readable Codes of parameters parameters Control of the minimal insulation level of the AC motor rid Other parameters and controls Mode with minimal set Sin of user defined parameters Indication on the SiP UBZ-302 front panel before the permission to start the motor - 10 Default factory setting 5 Min value Max Value 0 10 0 1 1 0 2 1 Parameter indication mode SiC 0 1 1 Operation mode for the functional relay output rrS 0 2 0 Timer setting for the functional relay, sec Tota
Default and readable Codes of parameters parameters Action of transducer to the loss of connection rSP Min value Max Value 0 3 - 11 Default factory setting 0 Action 0- continuation of transmission without alarm indication 1- alarm indication and continuation of the operation 2- alarm indication and motor stop with the allowed autoreclosing when the connection resumed 3- alarm indication and motor stop with prohibited autoreclosing even if connection resumed 0-disabled Detection of 0 120 0 rSO over
- 12 - 1 – Green LED “SETUP” – glows when the relay is in the mode of adjusting the parameters 2 – Green LED “LOAD” – glows then the output contacts of power relay are closed 3 – GreenLED “RELAY” – glows when output contacts of functional relay are closed 4 – Green LED “MMSP” – glows when UBZ-302 is operating in the mode with minimal number of setting parameters 5 – 3 DIGITS 7-SEGMENT LED INDICATOR: shows the name of parameter that doesn’t belong to the list of minimal number of setting parameters glows th
- 13 - Is corresponds the setting “i = S”, where T – is fixed time-delay of tripping Figure 1.2 - Principle of operation of the maximal current protection with independent time-delay Protection with time-dependent delay corresponds to MEC standards 60255-3 and BS 142 In corresponds the setting “i n d” (rated motor current); T (parameter “i = t” – time constant for protection performance) – corresponds to the tripping time-delay for 10 In).
- 14 Long lasting (overcrank) motor start. During the motor starting this type of protection trips the motor OFF when all phase currents exceed the value of Is setting (parameter “PPS”) and it lasts longer then the user defined parameter “PPt”. Blocked rotor At normal motor operation after the start protection trips the motor OFF – when all phase currents exceed the setting value within the time more then delay LT (parameter “Pbt”). Figure 1.4 - Long lasting motor start and blocked rotor 1.2.5.7.
- 15 - I/In – multiplication factor for current over the rated value; Т/Т2 – actual tripping time basing T2. Figure 1.5 - Current-time characteristic 1.2.5.8. Protection of motor coils from overheating Depending on selected settings protection may work on temperature Channel 1 with the following temperature sensors: 1) built-in to the motor case temperature sensors (C1r=1). In this case settings C1S are disabled and thus short circuit of the sensor and wire-break for the sensor are not controlled.
- 16 When ri d=5 and ri d=10, power load will turn ON after the recovery of the insulation and the expiration of the autoreclosing time delay. When ri d=15 и ri d=20 autoreclosing will not happen. 1.2.5.12 Phase loss protection will trip and turn the motor OFF if on one of the phases current is more than 10% of rated (parameter “In d”) and on any of other phases it is less than 7% of rated motor current. 1.
- 17 - rated current for current transformers (in case of using the external current transformers); - rated current for the motor (usually written on the motor shield). The difference between the MMSP mode and USERS MODE is that in MMSP mode the other parameters that doesn’t belong to list of MMSP mode – they are set as factory default.
- 18 2.3. FIRST START UP PREPARATIONS 2.3.1. When using the AC motor with the rated power from 2,5 and up to 30 kW it’s allowed to use built-in current transformers. It’s necessary to let the wires going to the motor through the corresponding holes in the case of UBZ-302. Each phase wire must go through its individual hole. When using the motors with another rated power it’s necessary to connect (see Figure 2.1) current transformers with the rated output current of 5A.
- 19 - Figure 2.1 - Wiring diagram for the UBZ-302 Depending on the value of parameter SiP on the front panel indicator will be shown: - line voltage between phases A-B Uab if parameter Si P=0; - resistance of the insulation (rid) if parameter Si P=1; - remaining time for the autoreclosing in seconds (Att) if parameter Si P=2.
- 20 the UBZ-302 will be completely deenergized. Parameter A rr is active for all type of faults except the voltage faults. To disable the autoreclosing for voltage faults it’s necessary to use parameters U = r , U = r, U n r. 2.4.2. UBZ-302 Operation after motor start (when currents exceed 10% of rated motor current). UBZ-302 performs the continuous monitoring of both voltage and current parameters. Output power relay opens its contacts when tripping of any of the protections mentioned in Table 2.
- 21 2.4.4.3. Communication protocol Exchange between PC and UBZ-302 realized in packet data exchange way. Data packet format is shown in the Table 2.1 below: Table 2.1 START ADR CMD DATA 0 ….
- 22 Table 2.4 Command message ADR CMD Data starting address Data CRC CHK low CRC CHK high 0x01 0x06 0x00 0xA0 0x03 0xE8 0x89 0x56 Answer message ADR CMD Data starting address Date CRC CHK low CRC CHK high 0x01 0x06 0x00 0xA0 0x03 0xE8 0x89 0x56 Command code 08h – diagnostics. Function 08h provides a number of tests to check the connection between the UBZ-302 and the PC and also tests the operation capacity of the UBZ-302. Function uses sub-functions field to specify the exact parameter testing.
- 23 Unsigned char length <- the quantity of bytes in the message buffer The function returns the CRC value as a type of unsigned integer. Unsigned int crc_chk(unsigned char* data, unsigned char length) {int j; unsigned int reg_crc=0xFFFF; while(length--) { reg_crc ^= *data++; for(j=0;j<8;j++) { if(reg_crc & 0х01) reg_crc=(reg_crc>>1) ^ 0xA001; // LSB(b0)=1 else reg_crc=reg_crc>>1; } } return reg_crc; } 2.4.4.6.
- 24 Notes: 1 Fault time – this is the time which passed since the moment of giving the power supply to the input terminals of the UBZ-302 and till the moment when this fault was detected. It’s being measured in minutes. 2 On the purchase of the UBZ-302 or after setting default factory settings to the LOG file of the faults the code of fault 40 and the value of the parameter 10000 will be written. 2.4.4.7.
- 25 - Table 2.7 Command register R_COMMAND Address = 299 0 1 2 Actions to perform Turn OFF the motor. If the motor is already stopped then it will not start until the remote command for a start will not be given. If the motor is running – then it will be switched OFF. Normal operation of the device.
Minimal resistance of the motor coils Alarm of the remote control panel Alarm motor stop with blocked autoreclosing and prohibited motor start Alarm motor stop with allowed autoreclosing by pressing UP and DOWN buttons simultaneously Short circuit of temperature sensor 1 Wire break of temperature sensor 1 Short circuit of temperature sensor 2 Wire break of temperature sensor 2 Wire break of phase Ari - 26 Insulation resistance 315 15 241:15 Adu 16 242:0 EAd 17 242:1 EOd 18 242:2 EoS 19 242:
- 27 - 3. TECHNIAL MAINTAINANCE 3.1. SAFEGUARDS When performing technical or service maintenance works UBZ-302 should be disconnected (deenergized) from input power supply. 3.2 ORDER OF THE TECHNICAL MAINTAINANCE Technical maintenance is recommended to make every 6 months – so that it’s necessary to check the tight wire connection to all input and output terminals and make visual inspection to be sure that there are no dents or mechanically caused defects on the plastic case of the UBZ-302. 4.
- 28 - APPENDIX 1.
- 29 - NOVATEK-ELECTRO UBZ-302
- 30 - APPENDIX 2 – UBZ-302 operation by the motor in the star/delta switching mode If before the start of the motor it is not necessary to test and check the insulation of the coils to the case of the motor then it’s allowed to connect the UBZ-302 according to the simplified scheme shown on Figure P1 below. If before the start of the motor it’s necessary to test the insulation level of the coils to the motor case then the connection must necessarily be done as shown on Figure P2.
- 31 - L1 L2 L3 N X1-1 Term DESCRIPTION UBZ-302 27 L1 28.5L2 30 L3 31.
