Installation Guide
9
8.
Ensure the circuit breaker for the supply circuit and the Run/Standby
control on the PSU are
off
. Use a small diameter pin to press and release
the Run/Standby control so that it is not pushed in (which is the Off
position).
9.
Connect the supply cable wires to the circuit breaker.
10.
Turn on the PSU by pushing in the Run/Standby control with a small
diameter pin.
Checking LEDs
LEDs indicate the operational status on the faceplate of each PSU and on the
front panel of the switch.
After you have inserted the PSU and powered on the switch, check the LEDs for
correct operation by using the following tables.
Table 1: LEDs on the power supply unit and fan-only module
LED
State
Description
Fault
Red
The temperature of the PSU has exceeded the limit of
75º C (167
º
F), or the FOM has failed.
PWR
Green
A PSU is installed in the switch and is receiving power.
FOMs do not have this LED.
