GE Industrial Solutions LP11 924 Series 6 & 10 kVA - Manual (Page 11)

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OPM_LPU_11U_6K0_10K_1US_V010.Doc 10 User manual LP11 924 6 & 10 kVA UPS 1.0
3.4 - AUTOMATIC BYPASS SWITCH
If the output converter is unable to deliver the demanded output power because of overload or over temperature, the
automatic bypass switch will automatically transfer the load to the utility. When the situation is corrected the UPS will
switch back to normal operation, i.e. the load is transferred back to the output converter. Though the automatic bypass
switch is shown as a simple mechanical switch in figures 2-5, the transfers are done electronically, without any
interruption of the power supplied to the load.
In case of a severe overload or short-circuit the magnetic bypass circuit breaker (rear panel) may trip in order to protect
the UPS. If the current is insufficiently high to trip the breaker, the UPS will be switched off by the software in order to
protect the UPS and connected equipment.
Figure 4: Bypass operation: Automatic bypass
If a power failure occurs during bypass operation, load power may be lost. If the UPS functions under overload conditions it
may not be able to protect the load.
3.5 - MANUAL BYPASS SWITCH (SERVICE SWITCH)
The system can be bypassed manually using the manual bypass switch located at the rear panel. It is a two-position
switch: the normal position is '1': as in figures 2-4. Position '2' is the service position: the load is directly connected to the
utility input. This way maintenance of the UPS is possible without interruption of the power supplied to the load.
Refer service to qualified personnel only. See section 1.3 for further details.
The RFI filters and output transformer are always active.
Figure 5: Bypass operation: Manual bypass