GE 225 - Manual (Page 36)

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GE
OPM_SGS_ISG_M22_M30_0US_V011.doc 36/38 Installation Guide SG Series 225 & 300 kVA
4.1.3 Programmable input free contacts
Some programmable UPS functions (indicated in section 4.1), can be activated by closing an
external contact, if connected, on:
X1 / 10, 21 or J2 / 10, 23 User Input 1 (default = Not used) (RL1)
X1 / 11, 22 or J2 / 11, 24 User Input 2 (default = Emergency GEN ON) (RL2)
4.1.4 Gen Set Signaling (GEN ON)
If an emergency generator set supplies the UPS in case of Utility Failure and the generator is
particularly unstable in frequency, it should be suitable to install the signal “Generator ON”
on X1/11, 22 or J2/11, 24 (this input is programmed as default for this function).
When this contact closes, it causes the change of certain functions (programmable) such as:
• Enabling or disabling of synchronization and consequently the Load transfer to generator.
• Reduction or elimination or delay of Battery recharging during the generator operation.
In a parallel system a separate NO (Normally Open) contact must be
connected individually to each unit.
4.1.5 AUX external Maintenance Bypass
If the UPS system is equipped with an external Maintenance Bypass Switch, it is possible to
connect a NO (normally open) voltage free aux. contact from the External Bypass Switch to
the programmable input X1/10-21 or J2/10-23, making the UPS operate as if the internal
switch Q2 has closed.
This function can be activated by changing a dedicated parameter (password required).
When this NO (Normally Open) contact closes, the output Inverter Contactor K7 it is
automatically opened and the Load transfer back to Inverter will be inhibited.
In a parallel system, the input on customer interface of each unit must
be connected to a separate AUX contact of the External Maintenance
Bypass Switch.
4.1.6 Auxiliary Power Supply (APS) 24 VDC / 1A
XA
SGS_225-300_C
ustomer interfac
e 24VDC_01
4
3
2
1
1
2
3
4
Fig. 4.1.6-1 Terminals for connection 24 VDC
XA - 1 24 VDC
XA - 2 GND
XA - 3 24 VDC
XA - 4 GND