Alstom GEM80-500 Series, Техническое руководство

Страница: 102 / 140

7. Maintenance and Fault Finding GEM80-500 Series Controller
GEM80-500 Technical Manual (T2025En) (08/04) Page 7-2
7.2.6 Testing a GEM80 System
In test modes, GEM 80 output signals must be disconnected or in some way
deactivated to prevent accidental mobilisation of plant and machinery, or other
possible hazards.
7.2.7 Watchdog and Safety Circuits
The requirements for watchdog and safety circuits at Section 6 must be designed into
the system.
7.2.8 System Status Indication
The GEM80-500 Controller includes LEDs and an alphanumeric status display on the
front panel as shown at Figure 1-1.
It is most important that the status of the GEM80 system is known before any action is
taken with the controller – see 7.6.3 for full details.
7.3 Spare Modules
The only spare modules recommended for use with the GEM80-500 Controller are the
optional modules for Basic and Verification I/O, Serial Communications and the
Ethernet Module. These modules are listed at Table 1-1. If a spare controller is stored
for future use be aware of its 10 year battery shelf life limitation.
If it is necessary to return any modules to ALSTOM for repair they must be enclosed in
a static shielding bag, and suitably protected by wrapping in foam plastic, and packed
in a box labelled 'Caution Static Sensitive PCBs'.
7.4 Cleaning and Visual Inspection
CAUTION
When cleaning the product, never blow, always use suction to avoid damage.
The GEM80-500 Controller requires minimum maintenance but cleaning and visual
inspection should be carried out at time intervals determined by the user (dependent
upon application and environmental conditions).
The equipment must be isolated from its main supplies and associated equipment
before any cleaning or maintenance work is carried out.
Carry out the following:
(a) Periodically, remove dust and dirt from the controller using a vacuum cleaner,
brushes and soft cloths.
(b) Visual checks should be made for signs of wiring or component damage and any
damaged wiring or components should be renewed.
(c) Check all terminations within enclosures for security