EVC800i AUTOMATIC VOLTAGE REGULATOR
Specification, Installation & Adjustment Manual
10/02/2015
Page 4 of 9
Trim [TRIM] Adjustment
Caution
Any signal connected to this input must be fully floating and earth free.
Over Excitation [O/L] Adjustment
1.
V0 - V200 - V380
2. Excitation Output F+, F- :
3. Power Input :
4. Current Compensation Input S1 and S2 :
5. External Voltage Adjustment VR1-VR2 :
6. Analog Input A+ and A- :
7. Dip Switch : SW1 - ON :
SW1 - OFF :
SW2 - ON :
SW2 - OFF :
An auxiliary input is provided to connect to power factor controller or any other type of PLC controller and is design to
accept DC signal upto +/-5 V.
The DC signal present to this input adds to or subtracts from the AVR reference circuit input and allows the external
controller to alter the generator excitation. The TRIM control allows the user to determine how much control the external
signal has over the AVR. With the Trim control fully clockwise the external signal has full control, with the trim control
fully anti-clockwise has no control.
The AVR includes the protection circuit to remove generator excitation in the event of over excitation, this condition is
usually a result of overload and can damage the rotor component within the generator. The excitation is cut of after a
delay of 20 seconds. During this time delay the overload condition should be continuous. Clockwise rotation of the O/L
control increases the excitation trip level. An over excitation trip condition is indicated by Red LED. The generator must be
stopped to reset the overload trip condition.
: When the generator output voltage required is 220Vac, connect the
sensing input to the terminal V0 and V200. When the generator output voltage requires 400Vac, connect the sensing
input terminal V0 and V380.
Connect Brushless exciter field to terminals F+ and F-, be sure to observe polarity.
AVR power input is on P1, P2 and P3. Input can be 1 Phase or 3 Phase. 3 Phase PMG can be
connected directly to P1, P2 and P3. Without PMG, Main Winding can be used as a power input. In that case for 400V
system connect U to P1 and N to P2. For 200V system connect U to P1 and W to P2. If auxiliary winding is there, then
that can also be used to power the AVR.
Current transformer of In:1A is connected to this terminal for parallel
operation.
If remote adjustment is required then connect a 100K/1W potentiometer to
terminal VR1 and VR2. VR1 and VR2 are left unconnected if remote pot not in use
5Vdc from external controller is connected to A+ and A-
Increases response time. Can be used for 60 Hz machine to increase the response time
(Slow response) or with 220V system when slow response is needed.
Response as per STAB pot set
60 Hz
50 Hz. As per STAB pot set
Sensing Input Terminal
±
WIRING