18
◆
Switch OFF BATTERY breaker;
◆
Switch OFF MAINS breaker;
◆
Switch OFF BYPASS breaker(D
ual input version
);
◆
Switch OFF OUTPUT breaker;
At this time the bypass source will supply to the load through the MAINTENANCE breaker
.
Switch to normal operation (from mechanical bypass)
CAUTION!
Never attempt to switch the UPS back to normal operation until you
have verified that there are no internal UPS faults
◆
Turn ON OUTPUT breaker.
◆
Turn ON BYPASS breaker(D
ual input version
).
◆
Turn ON MAINS breaker
.
The UPS powers from the static bypass instead of the maintenance bypass, then
the bypass LED will light up.
◆
Switch OFF the maintenance bypass breaker, then the output is supplied by the
static bypass of the UPS.
◆
Put on the maintenance switch cover.
The rectifier will operate normally after 30 seconds. If the inverter works normally,
the system will be transferred from bypass mode to normal mode.
4.2.4 Cold start procedure
CAUTION!
Follow these procedures when the input AC Utility Failure, but
battery is normal
◆
Set the Battery Breaker to the “ON” for long run UPS.
◆
Turn ON the power switch for standard UPS.
◆
Turn ON the Output switch.
◆
Turn ON the power switch (power will feed to auxiliary power board).
◆
Trigger the cold start button as the position 5 of the below drawing.