Maintenance Bypass; Shut Down Procedure - KStar YMK3300 Series Manual

CAUTION!
Wait fo r approximately 30 seconds before you press the black start key

4.2.4 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
CAUTION!
If the UPS is running normally and can be controlled through the display, carry out
steps 1 to 5; otherwise, jump to Step 4.
◆ Open the cover of maintenance switch, the UPS turns to bypass mode
automatically.
◆ Switch on MAINTANCE switch;
◆ Switch OFF BATTERY switch;
◆ Switch OFF the MAINS switch;
◆ Switch OFF OUTPUT switch;
At this time the bypass source will supply to the load through the MAINTENANCE
switch.
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
◆ Open the front and rear doors of the UPS to be easily access to the main power
switches
◆ Switch ON the output switch;
◆ Switch ON the input switch;
◆ Switch ON the battery switch;
The UPS powers from the static bypass instead of the maintenance bypass.
◆ Switch OFF the maintenance bypass switch, then the output is supplied by the
bypass of the modules.
◆ 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.

4.2.5 Shut down procedure

CAUTION!
This procedure should be followed to completely shut down the UPS and the
LOAD. After all power switches, isolators and circuit breakers are opened,
there will be no output.
◆
◆
◆
◆
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Press the INVERTER OFF key on the LCD display ;
Switch OFF the BATTERY switch ;
Open the UPS door to easily access to the main power switch ;
Switch OFF the input switch.
Switch OFF the OUTPUT switch. The UPS shuts down ;
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