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IPECS
Release 5
Hardware Description & Installation
4.4
PSU Installation
The Power Supply Unit (PSU) is installed in slot 10 of the Enhanced Main Cabinet only. A back-up
power supply may be installed in slot 9 to provide redundant power operation. When a back-up
PSU is installed, should the main PSU fail, the back-up PSU immediately provides power to all of
the Modules in the Main Cabinet.
LEDs
The PSU has six LEDs on the front panel to display the status of PSU and fans in the Main Cabinet.
The function of each LED is shown in Table 4.4-1.
ALARM
PSU FAN
Alarm Switch
The PSU has a slide switch on the front panel. This switch activates/deactivates the local audio
alarm indication from the buzzer. If a local audio alarm indication is desired, the switch should be
in the On (up) position. If no local audio alarm indication is desired, the Alarm switch should be in
the Off (down) position.
RS-232 Connector
The PSU outputs status and alarm information over the RS-232 DB9 connector. Use the serial
cable provided with the cabinet to interconnect the PSU and the monitoring gateway Module. The
monitoring gateway Module is defined in the Cabinet Attributes Web Admin page (PGM 197).
When a back-up PSU is installed, the serial cable should be connected to the back-up PSU only.
Note that when employing a WTIM as the notifying gateway Module, Dip switch 3 of the WTIM, the
Serial Mode switch, must be set to OFF, the Main CPU Serial mode.
Power Switch and AC Power Input
The PSU has a fused AC Power Input and switch which turns AC power to the PSU On and Off.
Fuse.
A T6.3A L250V fuse is installed in the fuse holder below the AC input connector. Should the fuse
fail replace only with a T6.3 A L250V fuse.
The main PSU is installed as described below and shown in Figure 4.4-1.
Slide the PSU into slot 10 of cabinet.
Fasten the PSU by tightening the upper and lower thumb-screws on the front of PSU.
Plug the power cord into AC power input on the front of PSU.
To activate monitoring of the PSU and cabinet fans, connect the supplied serial cable from
Table 4.4-1 PSU Status LED Functions
LED
48Vdc
On when -48Vdc is OK.
5Vdc
On when 5Vdc is OK.
On when -48Vdc or 5Vdc fails.
FAN1
On when FAN1 fails.
FAN2
On when FAN2 fails.
On when PSU FAN fails.
LED FUNCTION
59
Issue 5.0
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