User's Manual

Installation

Type 7 PSU

Type 7 PSU s an auto-ranging basic power supply with battery back-up facility

The 7A PSU is an auto-ranging power supply with battery back-up facility. Release 7.15

supports only a 7Ah battery. Connection to the SIU is made using an integral co-axial lead

and D-Type plug connector. LEDs on the PSU indicate the following conditions:

PSU State LED 1

(Green)

LED 2

(Amber)

Connector

O/P

Normal

operation

On Off +V out

Mains fail Off On +V out

Mains &

batteryFail

Off Off 0V

The Type-7A can only be used with ST’s that have a 15-way D-type connector.

The 7B PSU is an auto-ranging power supply with battery back-up facility with extended

backup times

Note: Ensure a good power supply for the ST: PSUs have been connected to intermittent

supplies before, e.g. central heating timers. This will shorten the battery life (if fitted)

considerably as it is not designed to be constantly charged and discharged.

PSU (Type 7) Positioning and Securing

STEP PROCEDURE

1. Confirm the position of the Type-7 PSU, allow for adequate ventilation and service access.

Note: The life of the battery within the Type-7 PSU will be increased in a low temperature, but

standby time is improved in a warm environment. Ideally the location should be cool, as the

electronics within the unit will keep it warm enough to ensure a good standby period.

Warning: High voltages exist inside the product do not remove the cover to the main

electronics: No user serviceable parts inside.