GE_UPS_OPM_SGS_ISG_10K_40K_0US_V070.docx
Installation Guide SG Series 10-20-30-40 UL S
3.8.8 Set-up for SG Series 10-20-30-40 when functioning as frequency converter
NOTE !
The set-up for SG Series 10-20-30-40 when functioning as frequency converter
requires a particular installation and adequate setting of some parameters,
(accessible only through password), and can therefore only be done by a QUALIFIED
SERVICE ENGINEER GE.
When the SG Series 10-20-30-40 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.
The handle of the switch Q2 - Manual Bypass
should be removed to avoid attempts to transfer
to Manual Bypass when the UPS is being used as
a frequency converter.
As an added measure of safety the
interconnection links BR1, BR2 and BR3 should
also be removed.
See Fig. 3.8.4-2 (SG Series 10 & 20) or
Fig. 3.8.5-2 (SG Series 30 & 40).
Fig. 3.8.8-1 Switch Q2 – Manual Bypass
NOTE !
The standard SG Series 10-20-30-40 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.
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