Basler Electric MVC112 User Manual
Instructions
Publication
9179200990
Revision
E
Instructions
Date
04/15
Copyright
2015
For terms of service relating to this product and software, see the Commercial Terms of Products and Services document available at
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.
www.basler.com
+1 618.654.2341 (USA)
Model
MVC 112
Part Number
9179200100
INTRODUCTION
The MVC 112 Manual Voltage Control provides
manual control of field excitation during generator
startup, commissioning, or a voltage regulator failure.
The MVC 112 supplies regulated dc field power
which is adjusted by a front-panel control. An
Auto/Off/Manual switch enables transfer of control
from a voltage regulator to the MVC 112 and vice
versa. MVC 112 controls are illustrated in Figure 1.
The MVC 112 is intended for through-the-panel
mounting. All connections are made at terminal
blocks located on the rear panel. If desired, an
external potentiometer (Basler P/N 21565) may be
used for remote manual voltage adjustment.
SPECIFICATIONS
Input Power
Nominal:
120 Vac or 240 Vac, 1-phase
Operating Range
120 Vac Nominal:
90 to 153 Vac
240 Vac Nominal:
170 to 305 Vac
Frequency:
50 to 400 Hz
Dissipated Power:
35 W
Minimum Residual
Buildup Voltage:
5% of 120/240 Vac, nominal
Output Power
Current Output
12 Adc at 32 Vdc, 63 Vdc, or 125 Vdc nominal
voltage
Voltage at Maximum Potentiometer Setting
At 32 Vdc Nominal Output:
40 Vdc minimum
At 63 Vdc Nominal Output:
79 Vdc minimum
At 125 Vdc Nominal Output:
156 Vdc minimum
Minimum Acceptable Field Resistance
At 32 Vdc Nominal Output:
2.67
Ω
At 63 Vdc Nominal Output:
5.25
Ω
At 125 Vdc Nominal Output:
10.42
Ω
Regulation Accuracy
2% for a 10% change in input power
5% for a 30% change in input power
Temperature Stability
±5% for a 50
C (122F) change in temperature
Environment
Operating Temperature: –40 to 70
C (–40 to 158F)
Storage Temperature: –40 to 85
C (–40 to 185F)
Maximum Humidity:
98%, non-condensing
Vibration Tolerance:
2 G over a range of 10 to
500 Hz
Shock Tolerance:
15 G in each of three
perpendicular planes
Agency Compliance
EAC Mark (Eurasian Conformity)
TP TC 004/2011
TP TC 020/2011
Physical
Weight:
12 lb. (5.5 kg)
Dimensions (H, W, D): 9.63 in., 7.19 in., 7.85 in.
245 mm, 183 mm, 199 mm
FUNCTIONAL DESCRIPTION
MVC 112 function is illustrated in Figure 2 and
described in the following paragraphs.
The MVC 112 supplies dc power to the field through
a phase-controlled SCR bridge. Adjusting the Manual
Voltage Adjust potentiometer changes the SCR firing
angle and the level of voltage applied to the field.
The MVC 112 is powered by a 120 Vac or 240 Vac
power source selected by positioning a jumper wire.
Input power frequency is also selected by a jumper.
One position selects a range of 50 to 100 hertz and a
second position selects a range of 100 to 200 hertz.
Removal of the jumper selects a range of 200 to 400
hertz.
During startup, an internal buildup circuit holds the
SCR power bridge at maximum output. When the
voltage builds to approximately 30 Vac, the buildup
circuit relinquishes control to the Manual Voltage
Adjust potentiometer.
The Auto/Off/Manual switch provides transfer control
from the voltage regulator to the MVC 112 and vice
versa. A freewheeling diode prevents arcing during
transfers.
MOUNTING
The MVC 112 is intended for through-the-panel
mounting in any location that complies with the
environmental parameters listed in the Specifications
section. It must be installed in an upright position for
maximum cooling. Overall MVC 112 dimensions are
shown in Figure 3. Panel cutting and drilling