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GCM02-MT-ING4 NEW.doc c/02 04/03/2003 ENG Page 26 of 57
WARNING the wiring for the CTs may introduce residual voltages into the M02 which will generate a value for a non-existent
current. To eliminate this go to the measurements menu, zero the current and press Reset. The M02 starts a self-programming procedure.
This should be done without any current on the power circuits. Where the load cannot be eliminated, short-circuit the wires on the CTs.
ELECTRONIC PROTECTION AGAINST OVERLOADS (51) AND SHORT-CIRCUITS (50) OF THE GENERATOR
The generators are supplied with their power expressed in KVA because the effective capacity limitation on the generator is given by the
Amps on the coils. Thus in order to effectively protect a generator the amps must be controlled.
Overloads 51:
If the rated current of the generator is exceeded following a set timing the generator contact maker is opened (at the same time the TRIP
40 and 41 contact is activated), the overload alarm is triggered and the generator is stopped following the motor cooling phase
(DEFAULT). (IT CAN BE EXCLUDED REGULATING THE THRESHOLD TO ZERO)
Short-circuit 50:
It trips immediately when the load current exceeds of 2 sec. the parameter set . The generator is stopped in the same way as in the
case of overloads. (IT CAN BE EXCLUDED REGULATING THE THRESHOLD TO ZERO)
These are active when the Generator Current contact is closed at 25.
Set under threshold and time settings.
WARNING measuring TAs are provided for the 50 function, to protect against shortcircuits, that are able to provide three times the
nominal current (5x3 = 15 A) in linear mode without reaching saturation.
ELECTRONIC PROTECTION AGAINST OVERLOADS OF THE MAINS CONTACT MAKER (CR)
With M02 shaped with TA (CT) on use (Fig. B), it is possible to control the mains parameters (KW, cosfì…) and the current that
circulates on the mains contactor.
While the unit is running with the mains connected an overload safety device is active on the mains contact maker (set at the rated
current of the contact maker), which when exceeded, triggers the mains overload buzzer alarm (51).
This is active when the Mains power supply contactor is closed at 24. (IT CAN BE EXCLUDED REGULATING THE THRESHOLD TO
ZERO)
Set under the threshold settings for the current, corresponding to the 1st Mains power supply Current setting.
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