Eps 7000 shared systems – MGE UPS Systems EPS 7000 User Manual
Page 46
2.10.3 Isolation of an Individual UPS Module
To isolate an individual UPS module for maintenance (allowing the remaining UPS modules to maintain the attached
load), follow this procedure (starting with all UPS modules operating normally, supplying the attached load):
1.
Stop the inverter by pressing the “inverter off” pushbutton on the UPS module front panel for 3 seconds. The
audible alarm will sound; silence the alarm by pressing the audible alarm reset pushbutton on the hidden panel.
If the transfer conditions are not satisfied (bypass out of tolerance or other reason), a forced transfer is required;
refer to Section 2.11, Forced Transfers.
2.
Open the UPS isolation circuit breaker Q5N.
3.
Open the battery disconnect circuit breaker(s) QF1.
4.
Open the input isolation circuit breaker Q1.
The UPS module is now isolated for maintenance. For complete protection, the upstream circuit breaker supplying
the UPS module should be opened, locked, and tagged while the UPS is being serviced.
To restart the UPS module after maintenance:
1.
Close the input isolation circuit breaker Q1.
2.
Close the isolation circuit breaker Q5N. The UPS module fans will start.
3.
Wait for the green LED “B” on the hidden panel to turn on (indicating that the rectifier/battery charger has
started), then close the battery disconnect circuit breaker QF1. If there is more than one battery cabinet in your
configuration, close all the battery disconnect circuit breakers.
IMPORTANT:
Because it is standard for the UPS module to be
programmed for automatic restart, the inverter will
automatically start after the battery disconnect circuit
breaker QF1 has been closed.
4.
If the module is not programmed for automatic restart, start the inverter by pressing the “inverter on” pushbutton
on the UPS front panel. In a few moments, the inverter will start and the UPS module will resume normal
operation. If the transfer conditions are not satisfied (bypass out of tolerance or other reason), a forced transfer
will be required. See section 2.11 Forced Transfers.
Operation
EPS 7000 Shared Systems
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