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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.
4. Automatic restart of the UPS is the normal configuration; the UPS inverter will start automatically and resume
normal operation. If your EPS 7000 has been programmed NOT to automatically 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 will resume normal operation. If the transfer conditions are not satisfied (bypass out of tolerance or other
reason), a forced transfer will be required. Refer to section 2.12, Forced Transfers.
2.12 Forced Transfers
This section describes the normal transfer conditions and the procedures to be followed when issuing forced transfers.
CAUTION: Opening Q4S with the inverter stopped in a UPS without
maintenance bypass will disconnect the attached load.
2.12.1 Uninterrupted Transfer Conditions
To transfer the load between the UPS module output and the bypass AC input (mains 2) source without interruption,
the following conditions must be satisfied:
◗ inverter output and bypass AC input phases must be in sync
◗ Bypass AC input voltage must be within 10% of nominal
◗ Bypass AC input frequency must be within a certain programmable tolerance of nominal
Provided that both the UPS module output and bypass AC input sources meet these conditions, uninterrupted
transfers can take place. If these conditions are not met, transfers cannot take place without interruption. A forced
transfer is required.
Forced transfers require a power interruption to the load of 0.8 seconds. Before issuing a forced transfer command,
be certain that the attached load can tolerate the brief outage. The following paragraphs describe the forced transfer
procedures.
2.12.2 Forced Transfer from Bypass AC Input Source to Inverter
Start the inverter by pressing the “inverter on” button on the front panel.
On the hidden panel, press the “security” key and hold it while pressing the “forced bypass to inverter” key
(pushbutton #4). The load will be disconnected for 0.8 seconds, then connected to the inverter.
2.12.3 Forced Transfer from Inverter to Bypass AC Input
On the hidden panel, press the “security” key and hold it while pressing the “forced inverter to bypass” key (pushbutton
#5). The inverter will stop and the load will be disconnected for 0.8 seconds; then the load will be connected to the
bypass AC input source.
Operation
EPS 7000 Single Module
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