OPM_LPS_31E_8K0_20K_1GB_V010.doc 10/40 Operating Manual LP 31 / 8-10-15-20 kVA
2.5 AUTOMATIC BYPASS SWITCH
If the output converter is unable to deliver the demanded output power (overload,
overtemperature) the bypass switch will automatically transfer the load to the mains.
If bypass operation is caused by an overload situation, the UPS will only switch back to output
converter if the load is reduced to less than 100%.
If bypass operation is caused by overtemperature, the UPS will only switch back when the
temperature has dropped below the alarm level.
In case of a severe overload or short-circuit the magnetic bypass circuit breaker (front panel,
see 4.1) 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.
See also chapter 4.5 “overload protection in bypass mode” for more information.
When the normal situation is restored, and the UPS was not switched OFF due to software
protection or bypass breaker trip, the load will be transferred back to the output converter
without any interruption.
If a bypass power failure occurs during bypass operation, load power is lost.
If the UPS functions under overload conditions it may not be able to protect the load.
Figure 3 - Bypass operation: automatic bypass
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