Ampcontrol gasguard, Installation, Operation & Maintenance Manual

Page: 16 / 79

GASGUARD IS CONTROLLER Issue: R2, Date: 26/09/2011, CRN: 7502
Page 15
2.6.6 Zone Block Configuration Warnings
The following points must be observed to ensure that the Controller can predictably signal an alarm
state via its relays. Failure to observe these points and select appropriate settings may result in
alarm indication failure.
•
Do NOT set a Zone Block Vote Count to a value greater than the number of included alarms. For
example, if a Vote Count of 3 is set, but there are only 2 included set-points, the included relay will
not become active even if both set-points are active.
•
Ensure that the vote count setting is such as to provide the desired logic in relation to active set-
points and relay operation (see examples 2 and 3 above)
•
Ensure that a required relay is included in a Zone Block’s setting.
•
Make sure that all relays included in a Zone Block are set to ‘ON’
•
Make sure that the Zone Block being configured for use is set to ‘ON’
•
Multiple Zone Blocks may be configured, each sharing the same set-point signals and relays. It is important
to ensure that the use of multiple Zone Blocks with possibly different settings, does not create conflict in
triggering relay events.
2.7 Setting Input channel Parameters.
Each of the four input channels may be configured to match the characteristics of the equipment connected to it.
Note: In all cases, the input signal type is fixed during manufacture to either:-
•
Current input. This input will normally operate over the range 4 – 20mA. Fault levels lie outside this range.
•
Voltage input. This input will normally operate over the range 0.4 – 2V. Fault levels lie outside this range.
A channel may be set to operate according to the following:-
Channel Activity
A channel may be set to be active or non-active. Inactive channels provide no process signals or alarm outputs to
functions further downstream.
•
A non-active channel is displayed as ‘OFF’.
•
An active channel is displayed as ‘ON’.
Gas Name
A channel may be identified by selection of one of six standard types, or a user specified type, namely:-
•
CH4 (methane)
•
CO (carbon monoxide)
•
O2 (oxygen)
•
H2S (hydrogen sulphide)
• AV (Air Velocity)
• DP (Differential Pressure
• User (7 character name may be input)