Wiring Instructions for a DC PSU

Warning - For equipment using -(48-60)V DC PSUs, a qualified electrician must perform all connections to DC power and to safety grounds. Do not attempt connecting to DC power or installing grounds yourself. All electrical wiring must comply with applicable local or national codes and practices. Damage due to servicing that is not authorized is not covered by your warranty.

Caution - Wire the DC PSU with copper only. Unless otherwise specified, use only 10 American Wire Gauge (AWG) wire rated minimum 90°C for source and return. Protect the -(48-60)V DC (1 wire) with a branch circuit over-current protection rated 50A for DC with a high interrupt current rating.

Caution Connect the equipment to a -(48-60)V DC supply source that is electrically isolated from the AC source (reliably grounded -(48-60)V DC SELV source). Ensure that the -(48-60)V DC source is efficiently secured to earth (ground).

Kit Contents:

  • Terminal block ("RTN" and "-48V")

  • M3.5 x 0.06 (#6-32) nut equipped with a lock washer

Required wires:

  • One UL 10 AWG, 2 m maximum (stranded) black wire [-(48-60)V DC].

  • One UL 10 AWG, 2 m maximum (stranded) red wire (V DC return).

  • One UL 10 AWG, 2 m maximum, green with a yellow stripe, stranded wire (safety ground).

To assemble and connect safety ground wire:

  1. Remove the insulation from the end of the green or yellow wire, exposing approximately 4.5 mm (0.175 inch) of copper wire.

  2. Using a hand-crimping tool (Tyco Electronics, Manufacturer Part Number 58433-3, or equivalent), crimp the ring-tongue terminal (Jeeson Terminals Inc., R5-4SA, or equivalent) to the green and yellow wire (safety ground wire).

  3. Connect the safety ground wire to the grounding post on the back of the system by using a #6-32 nut equipped with a locking washer.

Item

Description

1

Nut - M3.5 x 0.06 Metric system (#6-32 UNC system)

2

Spring washer

3

Grounding post

4

Safety ground wire

To assemble DC input power wires:

  1. Remove the insulation from the ends of the DC power wires, exposing approximately 13 mm (0.5 inch) of copper wire.

    Warning - Reversing polarity when connecting DC power wires can permanently damage the PSU or the appliance.

  2. Insert the copper ends into the mating connectors.

  3. Tighten the captive screws at the top of the mating connector using a Phillips #2 screwdriver.

    Warning -To protect the PSU from electrostatic discharge, the captive screws must be covered with the rubber cap before inserting the mating connector into the PSU.

  4. Rotate the rubber cap clockwise to fix it over the captive screws.

  5. Insert the mating connector into the PSU.

Item

Description

1

DC wire "RTN" (RETURN or GROUND)

2

DC power connector

3

Captive screws

4

Rubber cap for captive screws

5

DC power socket on the DC PSU

6

DC wire "-48 V"