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GCM02-MT-ING4 NEW.doc c/02 04/03/2003 ENG Page 15 of 57
2.2. OPERATION
READINGS
All readings are shown on the display on two lines of 16 alphanumerical characters.
All the reading pages are controlled using the +/- push buttons, which run in both directions.
The reading pages available are the following:
• mains status, volts, hertz and amperes of phase 1
• R, S, T line mains voltage.
• RN, SN TN mains star voltage.
• Current on the three phases mains;
• KVA, KW, KWAr mains powers;
• Power factor, cosfì HZ mains;
• Generator status, volts, hertz and amperes of phase 1
• X, Y, Z line generator voltage.
• XN, YN, ZN generator star voltage;
• Current on the three phases gen-set;
• KVA, KW, KWAr gen-set powers;
• Kilowatthour gen-set;
• Power factor, cosfì, HZ;
• Differential trip switch, programmed current, dispersion current and programmed time;
• Battery, voltage and charging current;
• Status of the inputs;
• Status of the output;
• Start counter;
• Weekly timer for programming the automatic test.
• Operation active, automatic test, forced start, pilot GE, cut-out, etc.;
• Supplier’s name and telephone number;
• Maintenance, with programmed hours and working hours remaining before service.
If an alarm is triggered it will be shown on the display. For example a low oil pressure, fuel reserve, high battery voltage alarm, etc.
2.3 DETAILED DESCRIPTION OF HOW THE CONTROL UNIT WORKS
All operational modes are controlled by the GC-M02 control panel equipped with a programming switch to select the following functions:
1. TEST
2. AUTOMATIC MODE
3. LOCK MODE
4. POWER SUPPLY FROM MAINS.
5. MANUAL START.
6. POWER SUPPLY FROM GENERATOR.
1 TEST
1.A. it performs all the automatic functions with the exception of the switching function.
1.B. it tests the efficiency of the whole system without disconnecting the mains power supply
to the utility.
1.C. all safety devices are enabled while the test is running.
1.D. if the mains should be disconnected while the test is running the generator starts immediately .
1.E. the test ends automatically when the mains power supply is restored or following a programmed external command.
2 AUTOMATIC MODE
2.A. A special three-phase voltage relay is capable of working at a voltage of 8Kv to safeguard the mains against:
• sagging of over -20% of the rated voltage (this can be modified);
• excessive rise in the rated voltage of over +15% (this can be modified);
• missing phase;
• incorrect angle between the phases (phase displacement).
2.B. If one of the above-mentioned anomalies should occur the CR mains contact maker is immediately opened to safeguard its
integrity also in the case of excessive voltage sagging.
2.C. When the mains is disconnected a starting delay timer is triggered (programmable time). It makes the system insensitive to
brief mains disconnections. A buzzer will sound in this case.
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