Maintenance - Honeywell 5704 Operating Instructions Manual

MAN0448_Issue 13_ 01-2010
005704-M-5001 A03249
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 60079-29-2 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,
Quad Relay Interface Cards and if fitted to the Expansion Relay
Card.
(2) Check that the Engineering Card power on ( ) green LED is
illuminated and all other LEDs are extinguished.
(3) Check the display of each channel in use, of every control card,
indicates a normal reading with no error messages.
(4) Select each channel of every control 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 of every control 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.
5-6
5704 Control System