ELECTRONIC MANUAL VOLTAGE CONTROL
Model: MVC 300
Part Number: 9 1210 00 106
Publication Number: 9 1210 00 993
Date: July, 1993
Revision F: July, 1996
WARNING
To prevent personal injury or equipment damage, only qualified technicians/operators should install, operate, or service this device.
CAUTION
Meggers and high potential test equipment should be used with extreme care. Incorrect use of such equipment could damage components contained in the device.
CONFIDENTIAL INFORMATION
of Basler Electric Company, Highland, IL. It is loaned for confidential use. Subject to return on request and with the mutual understanding that it will not be used in any manner detrimental to the interests of Basler Electric Company.
It is not the intention of this manual to cover all details and variations in equipment, nor does it provide data for every possible contingency regarding installation or operation. The availability and design of all features and options are subject to change without notice. Should further information be required, call Basler Electric Company, Highland, IL.
Rev |
ECA |
E |
15588 |
F |
15760 |
SECTION 1
GENERAL INFORMATION
1-1. PURPOSE
The Electronic Manual Voltage Control (MVC-300) is used as a back-up control device to provide manual voltage control in case of voltage regulator failure. The unit can be mounted on a control panel in ground vehicles, stationary equipment or shipboard locations.
1-2. OVERALL DESCRIPTION
The MVC-300 is a solid-state device enclosed in a metallic dark grey chassis and designed to be 'through-the-panel' mounted with controls accessible to an operator from the front of the panel. A terminal strip located on the rear of the device facilitates installation and operation. A MANUAL VOLTAGE ADJUST control and an AUTO-OFF-MANUAL voltage control mode switch are provided on the front panel.
1-3. SPECIFICATIONS
Table 1-1 provides the electrical and physical specifications of the MVC 300.
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Table 1-1. Specifications. |
Input Power: |
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120 Vac, + 10%Single-Phase, 50-320 Hz. |
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240 Vac, + 10%Single-Phase, 50-320 Hz. |
Output Adjustment |
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Range: |
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120 Vac Input: |
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1 to 32 Vdc or 1 to 63 Vdc. |
240 Vac Input: |
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1 to 63 Vdc or 1 to 125 Vdc. |
Watts Dissipated: |
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30 W maximum. |
Minimum Residual |
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Voltage for Build- |
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6 Vac. |
up: |
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Ambient Operating |
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-40 °F (-40 °C) to +158 °F (+70 °C) |
Temperature: |
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Ambient Storage |
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-85 °F (-65 °C) to +212 °F (+100 °C) |
Temperature: |
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Shock |
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Withstands up to 15 G's in each of three mutually perpendicular axes. |
Vibration: |
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Withstands the following: |
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5 - 27 Hz @ 1.3 G's, |
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27 - 52 Hz @ 0.036" double amplitude, |
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52 - 500 Hz @ 5 G's. |
Weight: |
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3.0 lbs. (1.36 kg) net, 5 lbs. (2.26 kg) shipping. |
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1-1
SECTION 2
PRINCIPLES OF OPERATION
2-1. GENERAL
a.The Electronic Manual Voltage Control (MVC-300) is a phase-controlled, silicon-controlled, rectifier (SCR) bridge. By adjusting the front panel MANUAL VOLTAGE ADJUST control, the firing angle of the SCR change providing an adjustable voltage level to the exciter field.
b.During start-up, the build-up circuit holds the SCRs power bridge at maximum output. When the voltage has built-up to approximately 30 Vac, the internal build-up circuit relinquishes control to the MANUAL VOLTAGE ADJUST control on the front panel.
c.The AUTO-OFF-MAN voltage control mode switch allows transfer from the voltage regulator to the Manual Voltage Control or from Manual Voltage Control to voltage regulator. A free wheeling diode remains connected to the field to allow safe switching without arcing.
d.The MVC-300 is designed to operate from 120 or 240 Volt nominal sources without any electrical changes such as tap selection or terminal connections. Taps are provided to select 32, 63, or 125 volt maximum outputs.
2-1
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