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Series 7400 Single Phase 1+N UPS
Figure 2 illustrates what is known as the “Split Bypass”
configuration. This is the standard configuration for all 1PH Models
In the “Split Bypass” configuration the static bypass line is switched
by a separate isolator to a dedicated ‘Bypass’ power source which
also feeds the maintenance bypass line.
The power switch locations in the various 7400 models are shown
in Figure 3.
With the exception of the maintenance bypass isolator, all the
isolators shown must be closed during normal UPS operation.
Although it cannot be classified as a ‘power’, the reset switch may
be used as a part of the UPS operating procedure. Fitted to the
UPS Logic Board, the reset switch is used by the operator to re-
transfer the load to the inverter following a detected overload or
overtemperature fault.
The battery is connected to the DC Busbar through a circuit
breaker fitted inside the battery Cabinet / Rack or located adjacent
to the batteries where a battery Cabinet / Rack is not used. This
circuit breaker is closed manually, but it contains an undervoltage
release coil which enables it to be tripped from the UPS control
electronics following certain detects for faults. It also has a
magnetic trip facility for overload protection.
1.2.4 UPS Power
Switch
Configuration
1.2.5 Battery Circuit
Breaker