MGE UPS Systems POWER-SURE 700 - Manual (Page 23)

3.0 Scope
This section contains preventive maintenance for the Power-Sure™ 700, electrical connection troubleshooting,
checking power modules (SCR), voltage adjustments, and PCB card troubleshooting to assist the user with commu-
nication and configuration connections.
WARNING: HIGH VOLTAGE DANGER OF ELECTRICAL SHOCK, TURN OFF ALL POWER
SUPPLING THIS EQUIPMENT PRIOR TO MAINTENANCE. ONLY QUALIFIED
ELECTRICIANS SHOULD PERFORM MAINTENANCE OR TROUBLE SHOOTING.
3.1 Preventive Maintenance
To ensure longer component life and trouble free operation, minor preventive maintenance procedures should be
performed at regular intervals, recommended once every year. More frequent inspection intervals would be needed
for more severe operation conditions and and larger number of hours of continuous operation.
At each service inspection, remove any dust, dirt or foreign particles. Thoroughly inspect and tighten any loose
electrical connections. A slight tug should be used to test if there are any loose electrical connections. Make sure
all cooling fans are running.
A. At each service inspection, remove top and side panels and carefully remove any accumulated dust, dirt, or foreign
particles. Special care should be exercised in cleaning the thyristors, heat sinks, and the control assembly.
B. Inverse Parallel Silicon Rectifiers (SCRs) or Thyristors.
The silicon controlled rectifiers (SCRs) usually fail in the shorted mode. When this happens, normally the fusible
link within the SCR will be blown open to clear the short and prevent damage to the transformers. The individual
SCR can be checked with an ohmmeter. Refer to Section 3.4 for resistance checking procedures.
C. A simple performance checklist has been developed for use in maintenance, on pages 3-2 and 3-3. Check off
items 1-8.
D. After items 1-8 have been checked on the performance checklist, the next step is to check the operation of
the system.
E. Replace top and side panels. Turn unit on with no load. Check item 9 on the performance checklist.
F. Turn on loads and check items 10-13 of the performance checklist.
NOTE: Preventive Maintenance plans are available. Please contact the Customer Care
Center for information.
Installation and User Manual
Maintenance
M a i n t e n a n c e
3 —1 86-108814-00 B01