IV432E Rev.01 SIEL S.p.A.
Installation and user manual
Date of issue: 2021-05-05
Pag.
23
of
50
+ FR
4.2.2 Test procedure
CAUTION!
The UPS is operating normally. It may take 60 seconds to boost up the
system and perform self-test completely.
ƹ
Switch off the MAINS to simulate utility failure, the rectifier will turn off and the battery
should feed the inverter without interruption. At this time, the LEDs of battery should be turned on.
ƹ
Switch on the MAINS to simulate utility recovery, the rectifier will restart automatically
after 20 seconds and the inverter will supply to the load. It is suggested to use Dummy loads
for testing. The UPS can be loaded up to its maximum capacity during load test.
4.2.3
MAINTENANCE BYPASS
To supply the load via Mains, you may simply active the internal mechanical bypass switch.
CAUTION!
The load is not protected by the UPS when the internal mechanical
bypass system is active and the power is not conditioned.
Switch to mechanical bypass
If the UPS is running normally and can be controlled through the display,
carry out steps 1 to 6.
(1) Open the cover of maintenance switch, the UPS turns to bypass mode
automatically.
(2) Turn on MAINTANCE breaker;
(3) Switch OFF BATTERY breaker;
(4) Switch OFF MAINS breaker;
(5) Switch OFF BYPASS breaker(D
ual input version
);
(6) 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
ƹ
Turn ON OUTPUT breaker.
ƹ
Turn ON BYPASS breaker(D
ual input version
).
ƹ
Turn ON MAINS breaker
.
The UPS powers from the static bypass instead of the maintenance bypass, then
the bypass LED will light up.
ƹ
Switch OFF the maintenance bypass breaker, then the output is supplied by the
static bypass of the UPS.
ƹ
Turn on battery breaker.
ƹ
Put on the maintenance switch cover.