
GEM80-500 Series Controller
7. Maintenance and Fault Finding
(08/04)
GEM80-500 Technical Manual (T2025En)
Page 7-3
7.5 Batteries
The battery used with the GEM80-500 Controller is a Lithium Thionyl Chloride type. It
has a minimum life of 10 years and is not a user serviceable part. The controller has
an integral Flash EPROM and therefore many applications will not require a charged
battery. The controller will provide a warning about low battery power in the F-Table
(F2.4) and by LED on the front panel of the controller.
It is recommended that the controller be included on any scheduled plant maintenance
programme and returned to ALSTOM for battery renewal after 10 years operating life.
Please also note that any GEM80-500 Controllers held in storage for spares purposes
will also be subject to the 10 year lifetime for the battery.
7.6
Use of LED and Display Indicators
7.6.1
Controller Front Panel Indications
The front panel of the GEM80-500 Controller has various LEDs and displays, shown at
Figure 7-1. Where a fault is evident, a quick guide to the state of the system can be
obtained from the front panel indications.
The LEDs and displays are:
(a) Alphanumeric Status Display;
(b) Watchdog
LEDs;
(c) Rx, Tx and Active LEDs for Ethernet;
(d) Rx, Tx and Active LEDs for the Programming Port;
(e) Battery Low LED.
The front panels of each of the optional modules also include LED displays to identify:
(1) The Basic or Verification I/O Ribbons for 9713-4020 and 9713-4021 Modules;
(2) The Module Numbers, Rx and Tx activity for the 9714-4020 Serial
Communications Module.
(3) The Module Number, Rx and Tx activity for the 9720-4020 GEMCAN I/O Scanner
Module.
(4) The Cd and Te activity for the 9730-4020 FIP Module.
The indication lamps give an idea of which parts of the system are faulty. Other
messages, via the alphanumeric status display, provide an indication of the state of the
system.
7.6.2
Alphanumeric Status Display
The four-character alphanumeric status display mounted on the front panel of the
controller (see Figure 7-1) is used to provide a local visual indication of the state of the
controller and reduces the need to use a programming tool for routine maintenance.
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