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3.8.5Setup for SG Series when functioning as frequency converter
When the SG Series is utilized for different output frequency compared to the input frequency, the Automatic Bypass and Manual Bypass functions are disabled, therefore the Load cannot be transferred to Utility in case of overload, short circuit, or inverter failure.
In situations where the UPS needs to be powered down for maintenance purposes, the critical Load must also be powered down during this time, the UPS cannot be transferred to
Manual Bypass, serious damage to the Load could result.
Circuit breaker Q2 - Manual Bypass must be blocked in the open position, to avoid any accidental closure, by means of a padlock or a similar device, when the UPS is used as a frequency converter.
As an added measure of safety the bus bar connections BR1, BR2 and BR3 should also be removed.
See Fig. 3.8.3-2.
Q1 
Q2 
Fig. 3.8.5-1 Switch Q2 – Manual Bypass
NOTE !
The standard SG Series UPS may be operated at 50Hz input with 60Hz output frequency conversion.
It is recommended that the static switch bypass be electronically blocked if the UPS is to operated as a frequency converter in order to prevent damage to the load.
Check with a Global Services Field Service Engineer to facilitate the parameter change.
CAUTION !
The output transformer of the UPS is designed for 60Hz only. Operation at 50Hz, 480V output may overheat the transformer. The optional 5th harmonic filter is designed for 60Hz operation.
If the UPS is purchased with this internal filter it may not be operated at 50Hz input or damage to the filter could result.
OPM_SGS_ISG_M22_M30_0US_V011.doc | 28/38 | Installation Guide SG Series 225 & 300 kVA |