Specifications

Turn-up
61189500L1-1F 4-11
TURN-UP
The following sections provide turn-up steps for applying power and logging in to the MX410/
MX412.
Power Up
To power up the MX410/MX412, perform the following steps:
1. Connect the MX410/MX412 to a reliably grounded –48 VDC or ±24 VDC source, which is
electrically isolated from the AC source.
NOTE
A readily accessible disconnect device, such as a rackmount fuse
and alarm panel that is suitably approved and rated should be
incorporated into the fixed wiring.
The branch circuit overcurrent protection should be a slow-blow
fuse or circuit breaker rated 2 amps or greater.
a. Determine which fuse pairs are to supply power to the chassis.
b. Remove the fuses from the A and B slots for the pair.
c. Pull the power connector straight out from the back of the MX410/MX412.
2. Install the power connector for DC power feeds A and B by connecting
RET A, PWR A, RET
B
, and PWR B to the power connector. PWR refers to respective –48 VDC or ±24 VDC power
sources, while
RET refers to respective returns.
a. Insert the power wires into the power connector and tighten the hold-down screws on
the top of the power connector.
b. Insert the power connector into the MX410/MX412 and tighten the two screws on the
front of the power connector.
WARNING
Installing the power connector at this stage provides power to the
MX410/MX412. The pins and connectors on the rear panel and
inside the chassis are powered. Exercise caution to avoid electrical
shock.
3. Apply power and check voltages.
a. Install appropriate fuses (2 amp slow-blow) in the slots in the fuse and alarm panel that
services the MX410/MX412.
b. Using a voltmeter, verify that the operating voltage is within the specifications for A or
B power feeds.
The A and B input voltage power feeds specifications are as follows: