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5. CARD LAYOUT
5.1.
Terminals
U
Power supply terminals
N
S1
Generator voltage sensing
...
terminals
S6
+
Output terminals (to the
-
exciter field)
A
Generator current sensing
B
terminals
6
Terminals for connection to
8
external control device
9
Terminals for connection to
-
Varicomp M40FA621A
+
60
60Hz mode selection
Hz
terminals
P
Terminals for connection to
Q
external potentiometer
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 adjuste 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
MIN
MAX
external potentiometer can be connected to the terminals P and Q (resistance about 100 kΩ, 1 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
Setup of regulation stability.
STAB
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 clockwise to increase the stability
Setup of the overexcitation threshold.
AMP
That limiter permits to protect the generator in case of over excitation due to load conditions that could cause the
rotor damage. Even if correctly set, this function does not substitute external systems protections, it is only a
MIN
MAX
completing device.
Turn clockwise to increase the limitation intervention threshold
963857132_I
AMP
FREQ
VOLT
P
Q
60
Hz
RED
YELLOW
PAR
LED
LED
A
B
8
6
9
-
+
STAB
SLOPE
S6 S5 S4 S3 S2 S1
-
+
N
U
ON
1
2
3
F
U
S
OFF
E
Micro-switches 1-4
12
4
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