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Chapter 4 – Installation
3
Powering Up
4
Preventive Maintenance Actions
Preventive Actions
RT412
The optical and both electrical outputs have the same signal as the one applied in the
time reference input. The length of the optical fiber cables should not exceed 2 km.
More than one device can be connected in parallel from one TTL output. The maximum
number of devices that can be connected to the TTL output depends on the current that
each device's input uses. As the maximum current supplied from each TTL output is
150mA, the sum of the currents from all devices connected cannot exceed this value
(cable resistance should be considered). The TTL voltage level is 5V.
Electrical cable length should not exceed 100m.
To minimize EMC effects in IRIG-B signals, the use of fiber-optic cable is recommended
for distances greater than 3 m.
Before energizing the unit, familiarize yourself with all the risks and attention indicators
in the equipment frame.
•
Connect the power supply (including the ground lead) to the appropriate
terminals, and the unit will power up;
•
If the time input is connected and selected correctly, the indicator Act will light up;
•
To turn off the unit, switch off the external switch or circuit breaker.
In case the unit does not behave in a way here described, carefully check all power and
signal connections. See Maintenance chapter for additional suggestion for problem
diagnosis.
In view of the critical nature of the application, GE products should be checked at
regular intervals to confirm they are operating correctly. GE products are designed for a
life in excess of 20 years.
The devices are self-supervising and so require less maintenance than earlier designs of
protection devices. Most problems will result in an alarm, indicating that remedial
action should be taken. However, some periodic tests should be carried out to ensure
that they are functioning correctly and that the external wiring is intact.
It is the responsibility of the customer to define the interval between maintenance
periods. If your organization has a Preventative Maintenance Policy, the recommended
product checks should be included in the regular program. Maintenance periods
depend on many factors, such as:
•
The operating environment;
•
The accessibility of the site;
•
The amount of available manpower;
•
The importance of the installation in the power system;
•
The consequences of failure.
For optimum performance of Reason RT412, perform the following preventive
maintenance procedures and actions:
Keep temperature and humidity at adequate levels inside the panel. The American
Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) recommends
RT412
25
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