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Q5N UPS OUTPUT ISOL.
SWITCH OPEN !
On a UPS module, this message indicates that the UPS module isolation circuit breaker Q5N
is open, making it impossible for that module to supply the load. On the SSC, this message
signals that the system isolation circuit breaker Q5N in the MBC is open, and the load is not
supplied unless the maintenance bypass circuit breaker Q3BP is closed.
Q3BP MAINT. BYPASS
SWITCH CLOSED !
This message indicates that the optional maintenance bypass circuit breaker Q3BP in the
MBC is closed. The system is set to maintenance bypass, and the load is supplied by the
maintenance bypass AC input source.
STATIC SWITCH O.L.
EMERGENCY OFF !
This message indicates that the SSC’s static switch and wrap-around circuit breaker Q2S have
opened following an overload condition, disconnecting the load.
BATTERY CHARGING !
This message indicates that the battery is being recharged.
INDEPENDENT INVERTER
FREQUENCY !
This message indicates that the inverter is operating in free-running mode, and is no longer
synchronous with the bypass AC input source (mains 2). Inverter frequency is stable within
0.1 Hz, but transfer of the load to the bypass AC input source is not possible without an inter-
ruption of power to the load.
NUMBER OF MODULES
READY INSUFFICIENT !
This message indicates that the load cannot be transferred from the bypass input source to
the UPS modules because not enough UPS modules have been started up.
UPS
TRANSFER LOCKOUT !
This message indicates that the load cannot be transferred from the inverter to the bypass AC
input (mains 2) source without interruption because the conditions for transfer without interrup-
tion are not met (see Section 2.4.6.1), or because the inverter is operating in free-running
mode or in current limit, or because the UPS has been commanded not to transfer without
interruption, or because of an internal fault.
2 — 42 Operation
EPS 6000 UPS Shared Systems