Table 6.1 Fault Code List Code indication (Note 3)

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1 62 Table 6.1 Fault List UA801 UA802 UA803 UA804 UA805 UA806 UA807 UA808 UA810 UA812 UA813 UA814 UA815 UA817 UA821 AC VOLTAGE OUT OF RANGE AC FREQUENCY OUT OF RANGE AC PHASE ROTATION ERROR OPE. OVER OVER OVER OVER OVER VOLTAGE OUT OF RANGE PHASE ROTATION ERROR FREQUENCY OUT OF RANGE EMERGENCY STOP ACTIVATED Input line voltage is out of the specific range. Input line frequency is out of the specified range. Input line power conductors are not wired in a proper phase sequence. The converter interlock is active. exceeded 105% of the rated exceeded 110% of the rated exceeded 125% of the rated exceeded 150% of the rated Short time overcurrent has exceeded 150% of the rated current Bypass line voltage is out of the specific range. Bypass line power conductors are not wired in a proper phase sequence. Bypass line frequency is out of the specific range. Transfer to bypass is not available due to bypass ity. The emergency stop was activated by the EPO switch or an external contact. The UPS cannot transfer to the bypass because the inverter output is not synchronized to the bypass. POWER SOURCE POWER SOURCE POWER SOURCE AC input AC input AC input Bypass Input Abnormal Bypass Input Abnormal Bypass Input Abnormal

2 63 UA822 UA824 UA827 UA831 UA833 UA834 UA835 UA860 UA861 UA870 UA890 UF001 UF002 UF003 UF011 UF052 UF056 UF059 UF102 CB2 OPEN 52C OPE. EMERGENCY SWITCH ON 52L OPEN DEPLETED/AC OUT STOPPED REMOTE BUTTON LOCAL BUTTON BALANCER OVER EXTERNAL ALARM CIRCUIT CB1 CB1 CIRCUIT DC OVERVOLTAGE The UPS cannot transfer to the bypass because of backup generator operation. The battery circuit breaker (CB2) is open. The interlock for the inverter output contactor (52C) is active. Emergency bypass switch has been turned on. The load circuit breaker (52L) is turned off. The battery voltage has reached the depleted level. The UPS could not transfer to the bypass because the bypass source has an ity. Remote start or stop signal is being received continuously for a considerable time. Local start or stop signal is being received continuously for a considerable time. The UPS detected a neutral point voltage unbalance. relay turned on. of the reference error signal. Detection of converter Precharging circuit is not working properly. discrepancy between reference signal and actual state of contactor CB1. discrepancy between reference signal and actual state of contactor CB1. Detection of converter of the reference error signal. DC voltage surpasses the overvoltage level. TURN ON CB2 Endof Discharge

3 64 UF103 UF108 UF109 UF110 UF111 UF112 UF119 UF128 UF151 UF152 UF154 UF156 UF157 UF158 UF159 UF160 UF161 UF162 DC UNDERVOLTAGE CHOPPER DC UNBALANCED ZERO PHASE DC CIRCUIT DC GROUND FAULT CONTROL POWER SUPPLY DC VOLTAGE DC VOLTAGE CB2 CHG.STOPPED ( OVERTEMP.) OVERTEMPERA TURE LIQUID LOW DC GROUND FAULT CHG.STOPPED (DC VOLT. ) DC voltage dropped below the undervoltage level. Detection of DC unbalance of the neutral point voltage. Detection of converter zerosequence Battery current unbalance. Sudden change of the DC voltage level. Detection of DC ground fault. Power supply voltage to IGBT driver PCB is below the specified level. 24 hours after input power restoration, batteries do not reach float voltage level. Unable to equalize the voltage of various batteries after 24 hours. During UVT, status signal from CB2 is ON. UF157 failure persisted for over 2 hours. Detection of overtemperature at the batteries. Low level of battery electrolyte solution. Detection of DC ground fault. Abnormal behavior of DC current sensor. UF151 failure is running for over 24 hours. detection based on battery selfcheck. s ound Battery Battery Battery

4 65 UF163 UF170 UF171 UF201 UF202 UF203 UF204 UF206 UF207 UF208 UF209 UF210 UF211 UF213 UF214 UF217 UF230 VOLTAGE VDB SENSOR OVERVOLTAGE UNDERVOLTAGE OUTPUT CIRCUIT ZERO PHASE 52C 52C 52C OVERTEMPERAT URE COOLING FAN OVERVOLTAGE ZERO PHASE Battery voltage is ity. of the difference between controlonly and protectiononly battery voltage. Battery current unbalance. Detection of output overvoltage. Output voltage dropped. Detection of inverter of the reference error signal (current reference and actual current). Discrepancy between output voltage and external voltage (bypass, common ac bus) Inverter zerosequence Cross current is ity. Error to close the contactor 52C. Error to open the contactor 52C. No answer from contactor 52C during inverter operation. Heatsink s temperature exceeds thermal settings. Thermal relay activated protection. Detection of inverter output phase overvoltage. Detection of zerosequence

5 66 UF253 UF256 UF257 UF258 UF259 UF301 UF302 UF303 UF305 UF306 UF309 UF310 UF320 UF323 UF352 UF363 UF371 UF372 OUTPUT VOLTAGE 52C ANOTHER UPS VOLTAGE CONTROL POWER SUPPLY CONTROL POWER SUPPLY Discrepancy between output voltage and inverter voltage, or between output voltage and bypass voltage. Output voltage is out of the specified range. Contactor 52C failed to open during load transfer from inverter to bypass. Load transfer due to overload for over 4 times within 5 minutes. No detection of another UPS voltage signal. AD reference has an value. Detection of an external interruption during the software execution. Timer does not reset in the specified period (WDT settings) Detection of an clock speed in the DSP or FPGA. Control power supply voltage is below the specified level. Inverter voltage is out of the specified range. Backup control power supplies exhibit condition. Cable disconnection in the parallel interface board during load supply. communication error during parallel operation. Backup control power supplies exhibit condition. Synchronization status signal is being received for a considerable time. communication error during parallel operation. Unable to synchronize the inverter output and the bypass voltage.

6 67 UF374 UF375 UF376 UF377 UF378 UF379 UF401 UF402 UF420 UF451 UF452 52S 52S 52L OPERATION ERROR 52S CB3 Cable disconnection in the parallel interface board. Unable to achieve synchronization for parallel operation. No control response from another UPS although its detection is possible. detection signal is being received continuously for a considerable time. No answer for sending synchronizing signal. Abnormal clock speed of the parallel control board processor. Error to close the contactor 52S. Error to open the contactor 52S. Load circuit breaker 52L opened during inverter operation. Contactor 52S failed during load transfer from inverter to bypass. Contactor CB3 is not working properly. 52L s ound 1) "" is defined as a major failure. Load transferred from the inverter circuit to the static bypass line; 2) "" is defined as a minor failure. UPS continues to operate normally, but cause of alarm must be identified; Indicates one of two possible LED illumination patterns continuously on (lit on) or intermittent (flicker). means: UA+++ UF+++ U%0++ Rectifier circuit failure U%1++ DC circuit failure U%2++ Inverter circuit failure U%3++ Control circuit failure U%4++ Bypass system failure

7 68 U%8++ U%+00 U%+49 failure U%+50 U%+99 failure *) + denotes any numeral from 0 to 9 *) % denotes either A or F

GUIDE SPECIFICATIONS 40-80kVA, kVA and kVA Scalable Three-Phase Uninterruptible Power System 1.0 GENERAL

1.1 SUMMARY Liebert NX UPS GUIDE SPECIFICATIONS 40-80kVA, 80-120kVA and 160-200kVA Scalable Three-Phase Uninterruptible Power System 1.0 GENERAL This specification defines the electrical and mechanical