Leprecon VX Series Dimmer - Manual (Page 5)

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2.2.1. Power Input
The VX and MX dimmers are designed as a component for use in large, high-power stage lighting
systems. It is the responsibility of the user to understand and properly follow guidelines and
regulations for the use of equipment of this type. It is beyond the scope of this manual to fully
explain all requirements and implications of connecting and operating dimming systems in general
and Leprecon VX / MX systems specifically.
If you have any doubts of your ability to specify, safely connect and use high-voltage, high-
powered equipment, please employ a qualified electrician.
3. VX and MX Power Requirements
3.1. VX / MX 2400 Power requirements
The VX2400 and MX2400 with the standard Terminal Power inlet requires 80 amps per leg of 3
phase power. Because of the neutral currents that can occur with phase control dimmers, the
neutral must be capable of carrying 150% of the current of a single leg, or 120 amps. Two screw
terminals are provided for double neutral wires to meet this requirement. It is recommended that
the safety ground be equal to the capacity of the hot legs, or 80 amps.
The Leprecon VX / MX dimmer systems are primarily designed for three phase, four wire with
ground power systems. Because of the variation in service from location to location, and the
possibility of improper connection, it is strongly suggested that the service is checked for proper
voltage with a meter before the dimmers are connected.
The VX and MX 2400 consists of twelve circuits of twenty amps each. Nominal line voltage is 115
VAC at 60 Hz. Special order models are available for 50 Hz and 230 volt operation.
3.2. VX / MX 1200 Power requirements
The VX1200 and MX1200 with the standard Terminal Power inlet requires 40 amps per leg of 3
phase power. Because of the neutral currents that can occur with phase control dimmers, the
neutral must be capable of carrying 150% of the current of a single leg, or 60 amps. It is
recommended that the safety ground be equal to the capacity of the hot legs, or 40 amps.
The VX and MX 1200 consists of twelve circuits of ten amps each. Nominal line voltage is 115
VAC at 60 Hz. Special order models are available for 50 Hz and 230 volt operation.
3.3. Over voltage Protection and Power Indicator
The VX and MX dimmer system uses a modular control card for each 12 channel dimmer. This
control card incorporates over voltage detection and shutdown to protect the dimmer electronics
and lamp loads from destruction.
The control card features three green LED's for power indication. These indicators show that each
phase is connected and within normal limits. If all three LED's are not lighted, power is not
applied, is out of range, or a fault is present in the system.
The internal protection takes effect at 140 volts AC. Voltages of this level or above will light the
red Over voltage LED on the power supply drawer front panel, and disable all dimmer control.