Emerson 7400 User Manual
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Series 7400 Single Phase 1+N UPS
Carry out the following checks from the mimic panel and log the
results:
1. Measure and record the battery float charge voltage.
2. Measure and record the battery charge current.
3. Measure and record the UPS output voltage on all three
phases.
4. Measure and record the UPS output line currents. If these are
significantly different from the values previously logged then, if
possible, record the size, type and location of any additional
load connected to the UPS supply since the previous
inspection. This type of information could prove useful to the
troubleshooting engineer should a problem occur.
If any of the above indications differ greatly from the previously
logged values for no apparent reason then you should contact
the Customer Service & Support Department at the address
given at the front of this manual for advice.
The equipment should be thoroughly cleaned and the following
checks carried out annually. This entails working inside the
equipment in regions containing hazardous voltages.
A manufacturer-trained engineer is fully aware of the hazards
concerned and will carry out this procedure with the load
connected to the maintenance bypass supply; however if the
customer decides to carry out this service procedure himself it is
imperative that the UPS be totally shut down and isolated from the
input mains supply and bypass supplies and batteries using the
procedure given below. We therefore strongly recommend that the
annual service is carried out by trained personnel.
1. Carry out the weekly checks detailed above.
2. Shut down the UPS following the recommended operating
procedure.
3. Isolate the UPS input mains supply externally (also the bypass
supply if a split bypass is in use) and isolate the battery.
4. Ensure that the UPS is totally powered down by checking for
voltage at the mains input terminals, battery connection
terminals, and output terminals (and bypass mains input
terminals in a split bypass configuration).
5. Gain full access to the UPS interior by opening its internal
hinged safety panel.
5.3.2 Weekly Checks
5.3.3 Annual Service