MarelliMotori M40FA610A MGC I Manuel Utilisateur page 12

5. CARD LAYOUT
5.1. Terminals
U
Power supply terminals
0
230
Generator voltage sensing
300
terminals
400
A Generator current sensing
B terminals
+ Output terminals (to the
- exciter field)
9
Terminals for connection to
-
Varicomp M40FA621A
+
60 60Hz mode selection
Hz terminals
P Terminals for connection to
Q external potentiometer
6
Terminals for connection to
8
external control device
M
Connection to ground for
internal EMI filter -
Connection to ground of
shield of shielded cables
5.2. Potentiometers
VOLT Setup of generator voltage.
Normally the internal potentiometer VOLT permits to adjust the voltage in a wide range; to obtain a finer possibility
of voltage setting or to adjust the voltage from the control panel, or in order to limit the voltage range, an external
MIN
MAX
potentiometer can be connected to the terminals P and Q (resistance about 1 kΩ, 2 W, for a voltage regulation of
±5%).
Turn clockwise to increase voltage
FREQ Setup of the Corner Frequency.
It is usually set at the factory in order to reduce the excitation when speed becomes lower than 90% of rated
speed at 50 Hz (frequency lower than 45 Hz, or corner frequency). By removing the bridge which normally shorts
MIN MAX
the terminals Hz and 60, the speed protection operates properly for 60 Hz operation mode.
Turn clockwise to decrease the frequency threshold
STAB Setup of regulation stability.
The regulation can be set on the field to adapt it to the characteristics of the plant and the driving engine (diesel
engine, water turbine, gas turbine) in order to obtain the best voltage response. To change the stability
MIN MAX
characteristics of the regulator, the potentiometer STAB must be adjusted.
Turn counter clockwise to increase the stability
STAT Setup of the droop.
This potentiometer allows to change the voltage droop for reactive compensation.
Turn clockwise to increase the droop
MIN MAX
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