MGE UPS Systems POWER-SURE 700 - Manual (Page 26)

3.2 Troubleshooting Guide
SYMPTOM PROBABLE CAUSES
1. No Output on One or More Phases. A. Blown Fuse.
B. Defective SCR or Power Module
C. Defective Control Card.
D. Defective Sense Card.
E. No Input.
2. Output is to High or to Low. A. Control Card Adjustment.
B. Defective Control Card.
C. Defective Sense Card.
D. Defective SCR or Power Module
E. Input Out of Range.
3. Input Breaker Tripping Off. A. Defective Breaker.
B. System Overloaded.
C. Over/Under Voltage Detection is Shutting
Down System (See Symptom #2).
D. Defective Over/Under Detection Card.
E. Shorted Taps.
4. Blowing Semi-Conductor Fuses. A. Shorted SCRs or Power Modules
B. Output Loads Shorted.
5. No Output Voltage. A. Defective Over/Under Output
Detection PCB.
WARNING: THERE ARE DANGEROUSLY HIGH VOLTAGES PRESENT WITHIN THE
ENCLOSURE OF THE POWER SUPPLY SYSTEM. UNDER NO CIRCUMSTANCES
SHOULD ANY PERSON REACH WITHIN THE ENCLOSURE OF THIS EQUIPMENT.
ALL SERVICE TO THIS PIECE OF EQUIPMENT SHOULD BE PERFORMED BY
QUALIFIED PERSONNEL ONLY.
3.3 Troubleshooting Power Line and Electrical Connections
NOTE: Circuit diagrams in this manual are for reference only. Always refer to the actual
circuit diagrams received with the system.
This procedure is written in a specific order and must be used from start to finish when troubleshooting. Any steps
skipped over may cause serious damage to the system.
Required equipment for troubleshooting the Power-Sure™ 700 is a True RMS Digital multimeter, SCR tester,
common hand tools, and a spare parts kit.
Maintenance
Power-Sure™ 700 — Three Phase Power Conditioners
3 —4 86-108814-00 B01