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GCM02-MT-ING4 NEW.doc c/02 04/03/2003 ENG Page 24 of 57
FUNCTIONING
When there is a lowering of the voltage (a), lower than the programmed value (es. Min V=320V) the CR mains contactor is
open (If setting OPEN CR=BY FAILURE MAINS) and after possible delays, it will have the cycle of start of gen-set (and the
open CR if setting OPEN CR=BY START).
When the voltage increases after overcome the +30V differential threshold (b), we have the normal condition of value within
the limits (320 + 30= 350V) which activates all the cycle of return mains.
If there is an increasing over the programmed value (c) (es. Max V 440V) it is had equally the cycle of start GE, and with the
lowering of the voltage under 15V differential threshold (d) it has the same condition of voltage within the limits(440 – 15=
425V) and associated cycles.
Network connections
THREE-PHASE / SINGLE-PHASE GENERATOR SENSOR
The generator sensor is sensitive to the maximum and minimum voltage in single-phase, and to the sequence in three phases. It can
work within a range of 60 to 600 V, with the same characteristics as the network sensor.
Generator connections
Max limit +10% Vn
Return limit, differential or
hysteresis 15V.
Vn nominal voltage
Return limit, differential or
hysteresis 30V.
–20% Vn min limit
V over limit = start
a
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