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Operation
18
Figure 3 Operator controls, typical system
Refer also to Figure 2 for a typical system one-line diagram.
Item Description Function
1
Input Circuit Breaker
(CB1)
This manually operated circuit breaker provides power to the UPS module rectifier. It is
located in the transformer cabinet of certain 500kVA and all 625, 750 and 1000kVA modules.
2
Control Disconnect
(behind door)
These two fuses provide power to the controls. They are normally closed (ON). Turn Control
Power OFF (by opening the two fuseholders) only for maintenance procedures.
3 Operator Control Panel Refer to Figure 4 for controls available on this panel.
4
Bypass Reset Switch
(behind door above
breakers)
Press this button to reset the transfer relays during start-up after an Emergency Power Off
shutdown. You must press this button before resetting the Close B.P. jumper (Item 5).
5
Close B.P. Switch
(behind door, on main
logic board)
Press switch to close the bypass circuit breaker during a start-up procedure, if it remains
open after a shutdown procedure. Refer also to 3.4.1 - Start-Up Procedure and Bypass
Reset Switch (Item 4 above). Note that the static switch disconnects must be open for this
jumper to close the bypass breaker.
6
Interlock Button (on rear
of Control Panel)
Press this button to make authorized changes to any site parameter protected by the Security
Access function. These include the time, date, auto-dial phone number and other site
parameters.
7
Bypass Circuit Breaker
(behind control panel)
This motorized circuit breaker connects the critical load to the bypass line.
8
Output Circuit Breaker
(behind control panel)
This motorized circuit breaker connects the critical load to the UPS inverter output.
100kVA-
500kVA
3
1
7
8
6
4
2
5
1000kVA