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MAN0443.P65 Issue 13 Aug 04
5701 Control System
05701-M-5001 A02279
CHAPTER 5 - COMMISSIONING AND
MAINTENANCE INSTRUCTIONS
4.
MAINTENANCE
To ensure that the system functions correctly, maintenance should be
carried out on a regular basis as dictated by the site regulations and
instructions for the type of sensor being used. For installations in the
EU, EN 50073 should be followed.
The system should be maintained in a clean condition and kept free
from dust and grease. The following checks should be made annually,
or more frequently if required by local regulations or procedures:
(1)
Check and if necessary tighten all terminations to the DC Input
Card and Interface/Relay Cards.
(2)
Check that the Engineering Card power on ( ) green LED is
illuminated and all other LEDs are extinguished.
(3)
Check that each channel card display indicates a normal reading
with no error messages.
(4)
Select each channel card in turn and check that channels sensor
signal reading and, if a catalytic sensor is connected, the sensor
bridge current.
(5)
With the Engineering Key fitted to the Engineering Card, select
each channel card in turn and enter the alarms test function.
(6)
Check the alarm levels, alarm LED operation, alarm relay operation
and display operation for each channel.
(7)
Check the operation of all fault and inhibit relays.
(8)
Check that, with the sensor in a gas free atmosphere, the display
indicates zero. If appropriate adjust the zero reading using the
ZERO
function.
Note: For oxygen applications the zero function should only be operated
in an oxygen free atmosphere. Under normal atmosphere
conditions the display should indicate 21%
±
0.5% v/v, this can be
adjusted by using the
SPAN
function.
The System 57 control cards and engineering cards carry out continual
self checking of the integrity of the hardware, software and sensor
operation. In the event of a problem, and depending on the type of
problem, the control card will indicate either an error message on the
LCD display or will operate the fault LED and relay output.
