COVER series MZ – User manual
COMEX S.A.
25
1. Switch UPS to Bypass mode according to the instructions in chapter 4.3.2.
The UPS works in Bypass mode, the UPS inverter is turned off.
2. Remove the bypass switch (Maintenance bypass breaker) cover located on the back of the power
supply and switch the disconnector to the Bypass position. The loads will be powered by a bypass
path. Open the rectifier and Bypass power disconnect switch disconnectors as well as the output and
battery disconnector located outside the UPS.
Warning
If it is necessary to open the UPS housing, eg during maintenance work, wait a minimum of
10 minutes until the DC capacitors are discharged inside the module.
4.3.5.
Switching from service Bypass mode to normal operation
The procedure described below allows you to switch the UPS from bypass mode (Service Bypass)
to normal operation.
1.
Close the Output breaker and Bypass input bypass (bypass breaker).
The Bypass LED will
turn green.
2.
Switch Maintenance bypass breaker to UPS position.
3.
Replace the retaining plate by the Maintenance bypass breaker before accidental use.
4.
Turn on the Power Breaker.
After approximately 30 seconds, the inverter must be started according to the procedure
described in 4.3.3
5.
Close the battery breaker located in or outside the UPS. The battery diode will go off.
4.4.
The procedure of complete switching off the power supply (power supply by mechanical
bypass).
To completely turn off the UPS and powered receivers, perform the 4.3.4 procedure to switch
to Bypass service mode and then disconnect the power supply from the UPS in the power
switchboard.
4.5.
Emergency shutdown using EPO
UPS emergency off button is located on the front panel of the UPS and is used for emergency
shutdown in the event of flooding, fire, etc. Using the EPO switch causes immediate switching
off the rectifier, inverter and disconnecting the voltage at the UPS output and stops the process
of charging or discharging the battery.
In order to start the power supply for normal operation after using EPO, it is necessary to restore
the emergency switch state to the normal position, give the supply voltage to the UPS and carry
out the procedure of starting the power supply from the total shutdown. To do this, restore the
switch position to the OFF position and follow the connection procedure in section 4.2.1.
警告
危 险
