MGE UPS Systems EPS 8000 User Manual

To shut down the UPS, press the “inverter off” pushbutton on the module front panel for 3 seconds.  To restart, press

the “inverter on” pushbutton. Note that the transfer will occur only if the inverter is synchronized to the bypass;

otherwise, a forced transfer is needed, see section 2.12 Forced Transfers.

This procedure assumes that the UPS is operating normally, with the attached load supplied via the UPS inverter:

1.

Stop the inverter by pressing the “inverter off” pushbutton on the UPS front panel for 3 seconds.  The audible

alarm will sound; silence the alarm by pressing the audible alarm reset pushbutton on the hidden panel.  See

section 1.5 Single Module Indicators and Controls.  

If the transfer conditions are not satisfied (bypass out of tolerance or another reason), a forced transfer will be

required., in this case refer to section 2.12 Forced Transfers for procedures.

2.

Depress transfer initiate switch.  Unlock and remove the key from key interlock.  Unlock and close the mainte-

nance bypass circuit breaker Q3BP, see Figure 1-10.

3.

Open the UPS isolation circuit breaker Q5N and lock open.  The UPS is now isolated from the load which is

supplied by the bypass AC input source.  

4.

Open the circuit breaker Q4S.  

5.

Open the battery disconnect circuit breaker(s) QF1.  

6.

Open the input isolation circuit breaker Q1.

7.

Remove the key from Q5N.

8.

Insert the key into key interlock and turn to lock.  The UPS system is ready for maintenance.

For complete protection, the upstream circuit breaker(s) supplying the UPS should be opened, locked, and tagged

while the UPS  is being serviced.  The UPS is now isolated for maintenance.  

To restart the UPS after maintenance:

1.

Close all the upstream circuit breakers supplying the UPS.  Close the input isolation circuit breaker Q1.

2.

Close the circuit breaker Q4S.  The UPS fans will start.  Verify that the UPS is on bypass.

3.

Depress transfer initiate switch.  Unlock and remove the key from key interlock.

4.

Insert the key into Q5N and unlock.  Close the UPS isolation circuit breaker Q5N.

5.

Open the maintenance bypass circuit breaker Q3BP and lock open.  Remove the key.

6.

Insert the key into the key interlock and turn to lock.

7.

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