68 Operation
System Status Messages
Thesystem status messages indicate whether the staticbypass switch is connected or disconnected, through the
manuallyoperatedStatic Switch Disconnects(see F igure 9). The statusmessages also advise the operator when
atransfer or retransfer between the UPS system and bypass line is permitted, based on matching voltage,fre-
quency,and phase.
Thefollowing status messages may appear in the system status area.
1. StaticSwitch Connected. The static switch is connected (the disconnect switches arec losed—ON)and is
readyprovide a current path from the bypass input to the load.
2. StaticSwitch Disconnected.The static switch is disconnected(the disconnect switches are open—OFF)for
maintenanceprocedures.
3. OK to Transfer.The UPS system voltage, frequency, and phase match the bypass line. Thism eans that a
transferbetween the bypass line and the UPS system is permitted.
4. NotOK to Transfer.Either the UPS or bypass voltage, frequency,or phase is not within the specified
limitsor the static bypass switch is not available. Therefore, manuallyinitiated transfer between the bypass
lineand the UPS system is not permitted. Emergency or overload transfer to bypassmay stillbe available
providedthe “static switch unable” alarm is not indicating.
Load Block Messages
Statusmessages in the Load block indicate how many modules are in thesystem, how many modules are ON
LINE,and whether the system is operating in the redundant mode.
Thefollowing status messages may appear in the load block.
1. NOF X MODULES CONNECTED. The number N is the number of UPS modules ON LINE. This means
themodule output circuit breaker is closed.X is the number of UPS modules in the system (connected to this
SCC).This number is set from the System Configurationscreen.
2. REDUNDANT.The capacity of the UPS modules ON LINE is sufficient tos upplythe critical load even if
onemodule is taken OFF LINE. The critical load will remain on the UPS systemif one module goes OFF
LINE.
3. NON-REDUNDANT.The critical load will be transferred tobypass if one module goes OFF LINE, and
youmust transfer the load to bypass in order to perform maintenance on any UPS module.
4. TIMETO OV ERLOAD TRANSFER. During an overload condition,the time remaining before transfer
(inseconds) is displayed at the bottom of the load block. At eachModule (MMU), the message is Time to
OverloadShutdown.
DISCONTINUED
PROD U C T