9. Maintenance and Fault Finding
GEM80-400
Page 9-2
ALSPA GEM
80-400 SERIES CONTROLLERS TECHNICAL MANUAL
Issue 3 04/99
9.4.
Batteries
9.4.1. General
The battery life times depend on the proportion of time that the battery is
supporting memory, and mains power is switched off.
The GEM
80-400 Processor Module memory is supported by a 950mA/H
lithium/manganese dioxide battery, which has a typical shelf-life of 6 years (4
years minimum) and a typical support life, after one year powered up, of 9 weeks
minimum at 70
°
C or 47 weeks minimum at 40
°
C.
N.B.
A type CR2477 battery
MUST
be fitted to modules having an orange battery
holder, and type CR2477N
MUST
be fitted to modules having a grey
battery holder
The memory modules which may be used with the GEM
80-400 Enhanced
Controllers are supported by a lithium/copper oxide battery, which has a typical
shelf-life of 10 years (5 years minimum). See chapter 10 for Replacement Suppliers.
The failure of any battery in a GEM
80-400 system is detected and is represented
by the message 'BATT' on the alphanumeric display of the processor module. In
the case of an Enhanced system, if a 'BATT' message appears, check first the
battery warning LEDs of any Central Highway Modules which may be fitted. If an
LED is lit, replace the battery of that module as instructed in the User Information
Sheet or Manual relevant to that module. If no LEDs are lit, or the system is
Standard, replace the battery in the processor module, following the instructions
given later in this chapter. Alternatively, an examination of the battery warning
bits, F2.4 for the processor module battery low warning and F2.5 for Central
Highway battery low warning, will indicate the faulty module.
When the battery warning message, BATT, is displayed, or when specified life
times have expired, the batteries should be renewed.
9.4.2. Battery Connection Procedure
The battery is supplied with the GEM
80-400 Processor Module, but not fitted.
During transport and storage, an insulating strip, with the label 'Pull' on it, is
wrapped around the battery, thus preventing connection to the circuit.
When the equipment is to be put into service, the battery must be electrically
connected to the memory module in the following manner:
(1)
Open the battery cover located on the module front panel.
(2)
Pull the exposed tab of the insulating strip. The battery will then make
contact with the circuit.
(3)
Close the battery cover.
The battery warning message, BATT, should disappear from the display.
