UPS471-02-00 PW9000DPA User Manual UK Dated 06/08/14
47
4: Operation
4.2.3 Transfer the load from UPS to maintenance bypass mode
If needed, to perform service or maintenance, it is possible to transfer the load to maintenance bypass and power down
the UPS module(s) whilst leaving the load connected to the raw bypass mains supply.
This procedure describes the sequence of operations to transfer the load to the maintenance bypass supply and then shut
down, and isolate, the UPS module(s).
Prior to commencing this procedure, check and confirm the following UPS system status (on all modules in a parallel
system):
• The mimic panel LED indications should be as per the following table (on all modules in a multi-module system):
• The LCD panel should display
LOAD PROTECTED
. If anything other than
LOAD PROTECTED
is displayed then
press the
RESET
button, and if
LOAD PROTECTED
is still not displayed there is a problem with the UPS – seek
assistance!
Transferring the UPS to (static) bypass mode:
1. On any one of the UPS module’s mimic panel press the
ENTER
key once to access the menu system.
2. Using the
UP/DOWN
keys, move the cursor so that it is adjacent to
COMMANDS
and then press the
ENTER
key.
3. Using the
UP/DOWN
keys, move the cursor so that it is adjacent to
LOAD TO BYPASS
and then press the
ENTER
key.
a) The UPS system will transfer the load to static bypass on all connected modules.
4.
On all modules
check and confirm that:
a) The
INVERTER
LED has extinguished.
b) The
BYPASS
LED is green.
c) The LCD displays
LOAD NOT PROTECTED
.
WARNING:
Before you close the maintenance bypass isolator ensure that the UPS is
operating in the (static) bypass mode.
All the operations in this section must be performed by authorised and trained personnel.
LED
Colour
LINE 1
Green
LINE 2
Green
BY PASS
OFF
INVERTER
Green
BATTERY
Green
LINE 1
LINE 2
BY PASS
INVERTER
BATTERY
LOAD
LED
Colour
LINE 1
Green
LINE 2
Green
BY PASS
Green
INVERTER
OFF
BATTERY
Green
LINE 1
LINE 2
BY PASS
INVERTER
BATTERY
LOAD