Chapter 2 Installation
2-3
2.2.2 Electrical Installation
Either AC power or DC power will be used, depending on the model ordered. Power connection is at the
rear panel. For the AC model, a power cord is supplied. For the DC model, -48 Vdc power is via a 3-pin
terminal block. Table lists pin definition.
Table 2- 1 Power Connector
Pin Number Signal Description
1 -V -DC 24 to 48 Volts
2 +V +DC Return
3 Chassis Ground
If dual module dual feed power supply is to be installed, wire independent power feeds to the power supply
card. With dual feed, if any one power source fails, or if any one power module fails, the remaining functions
of the unit will continue. If only one power feed is used, the advantage of dual power module is still available.
One LED for each power module indicates the status of that power module. When one power module has
failed, a scheduled replacement of the entire module is necessary.
The Loop-V 4200 MuxMaster is designed to allow for "hot plug-in". This means that interface cards can be
inserted and removed with the main chassis powered up. After each change of the plug-in cards, the
previous configuration of the port will be used if the replaced card is of the same type. Else the factory
default configuration for that card type will be used. User must change the configuration from the default if a
different card type is inserted.
Chassis Grounding
The chassis is grounded when rack mounted. However, for stand alone units or extra grounding protection
for rack mounted units, a dedicated chassis ground screw and lock washer is provided. The chassis ground
screw is located on the side of the unit close to the power supply.
When attaching a ground wire to the chassis ground screw, please follow these instructions.
• Use copper grounding conductors of the same AWG, or thicker, than those used on the power
connections
• Conductors should not be of dissimilar metals.
• The bare conductors should be coated with anti-oxidant before crimp connections are made.
• Unplated connection surfaces, connectors, braided strap and bus bars must be bought to a bright finish
and coated with anti-oxidant before connections are made.
• Listed connectors and fastening hardware must be used.
The chassis ground screw.
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