Basler Electric MVC112 - Manual (Page 2)

Publication
9179200990
Revision
E
Instructions
Date
04/15
Page
2 of 8
dimensions are illustrated in Figure 4. All dimensions
are shown in inches with millimeters in parenthesis.
CONNECTIONS
Typical MVC 112 connections are shown in Figure 5.
When making connections, 14 AWG or 12 AWG wire
should be used. Torque applied to the terminal
screws should not exceed 9 inch-pounds (1 newton
meter).
Input Power Configuration
Input power voltage and frequency values are
configured by positioning jumper wires on the
MVC 112 terminal blocks.
A nominal input power voltage of 120 Vac or 240 Vac
is selected by connecting a jumper across either the
“Tap” and “120” terminals or the “Tap” and “240”
terminals.
The MVC 112 is configured for an input power
frequency within the range of 50 hertz to 100 hertz by
connecting a jumper across the “50-100” and “Com”
terminals. A frequency range of 100 hertz to 200
hertz is selected by connecting a jumper across the
“100-200” and “Com” terminals. For a frequency
within the range of 200 hertz to 400 hertz, no jumper
is connected.
Field Output Configuration
A nominal output (field) voltage of 32 Vdc, 63 Vdc, or
125 Vdc is selected through connection of a jumper
wire across the “Com” and “32”, “63”, or “125”
terminals.
External Potentiometer Connections
If a remote potentiometer will be used for control of
the MVC 112 output, the wires of the internal
potentiometer must be disconnected from terminals
14, 15, and 16. Then, the remote potentiometer is
connected with the potentiometer wiper arm
connected at terminal 15. A 10 k
Ω, 1 watt
potentiometer (Basler P/N 21565) should be used.
OPERATION
Warning!
When the MVC 112 Auto/Off/Manual switch is
placed in the Manual or Off position, some
voltage regulator terminals remain connected
to the generator and present a potential shock
hazard.
With the Auto/Off/Manual switch in the Manual
position, the voltage regulator is removed from the
circuit and the generator output voltage is manually
controlled by the Manual Voltage Adjust control. The
Auto position enables automatic control of the
generator output with the voltage regulator. Complete
excitation shutdown occurs when the switch is placed
in the Off position.
Startup
The following steps are provided as a guide for
generator startup with the MVC 112.
1. Start the prime mover and adjust the Manual
Voltage Adjust control to the minimum (fully
counterclockwise) position.
2. Place the Auto/Off/Manual switch in the Manual
position. Allow the generator terminal voltage to
build. Note that the generator voltage may be
unstable (hunting) if the Manual Voltage Adjust
control is set below 30 Vac.
3. Use the Manual Voltage Adjust control to slowly
increase the generator terminal voltage until it
reaches the desired level.
MAINTENANCE AND TROUBLESHOOTING
No preventative maintenance is required other than
periodic inspections to ensure that the MVC 112 is
free of accumulations of dirt and moisture. Verify that
all connections are clean, tight, and free of corrosion.
Operational Test Procedure
Proper MVC 112 operation can be verified with the
following procedure if faulty operation is suspected. A
voltage regulator is not required for MVC 112 testing.
1. Connect the MVC 112 as shown in Figure 6.
Place the field voltage jumper in the 125 Vdc
position (across terminals “Com” and “125”).
Place the input frequency jumper in the
appropriate position for the applied input power.
2. Adjust the Manual Voltage Adjust control fully
counterclockwise and apply 120 Vac power to the
MVC 112.
3. Slowly rotate the Manual Voltage Adjust control
clockwise and observe that the brightness of the
light bulb increases proportionally until reaching
full brightness.
4. Rotate the Manual Voltage Adjust control fully
counterclockwise and remove the 120 Vac input
power.
5. Place the field voltage jumper in the 63 Vdc
position (across terminals “Com” and “63”).
6. Slowly rotate the Manual Voltage Adjust control
clockwise and observe that the brightness of the
light bulb increases proportionally until reaching
only half the brightness obtained in step 3.
7. Rotate the Manual Voltage Adjust control fully
counterclockwise and remove the 120 Vac input
power.