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Setup for SG Series when functioning as frequency converter
3.8.5
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.
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
Q1
Fig. 3.8.5-1 Switch Q2 – Manual Bypass
Installation Guide SG Series 225 & 300 kVA
28/38
GE
Q2
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