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8.3.7 Changing the Power Supply to Maintenance Bypass
This UPS must be completely shut down when performing maintenance and inspections. In
such cases, the power supply to the load will go through the maintenance bypass. Table 8.8
shows the procedure used to change the power supply to this maintenance bypass. Table 8.9
shows how to change the power supply from the maintenance bypass back to the UPS.
Table 8.8 Changing From UPS to maintenance Bypass Power Supply
Step Procedure LCD/LED Status (After Execution)
1-3 Same as steps 1-5 in Section 8.3.4 "Stop."
4 Turn ON maintenance
bypass AC circuit
breaker 52M. *
,
**
5 Perform steps 6
through 11 in Table 8.4
“Complete Shutdown”
on page 34 to shut
down the UPS
completely.
→Change to
maintenance bypass
power supply
complete.
When the UPS is shutdown completely, nothing at all will be
displayed on the LCD screen and all LEDs will be unlit.
* During load operation, always operate the circuit breakers in the following order :
52M ON→52lL OFF→ 52C OFF
** When power is supplied to the UPS, circuit breaker 52M cannot be turned on.
BATTERIES
AC
SWITCH
UPS
BYPASS
DISCHARGE
FLOAT CHARGE
EQUAL CHARGE
～
AC INPUT
～
CONVERTER
～
INVERTER
～
AC OUTPUT
BYPASS INPUT
～
BYPASS
MOVE #52C AND #52L TO ‘ON’
MCCB
52C 52M 52L
ON
ON
ON
52R 72B
OFF OFF
MCCB
52C
52M
52L
OFF
ON
OFF
52R 72B
OFF OFF