Ref: REFLEX/SCANFLEX MANUAL
EDITION 1: JULY ’97 25
FAILSAFE
On loss of power to the Controller all Controller relays de-energise but any relays on a
Relay Module will hold state.
On loss of power to a Relay Module, all the relays on it will de-energise.
On loss of echo (e.g. damaged transducer) the "fail-safe" position of each relay can be
designated as below.
Pr.23 Relay 1 Failsafe Common to all points (D=3)
1 = energise
2 = de-energise
3 = hold state (default)
Pr.24 Relay 2 Failsafe Common to all points
Options the same as Pr.23
Pr.25 Relay 3 Failsafe Common to all points
Options the same as Pr.23
Pr.26 Relay 4 Failsafe Common to all points
Options the same as Pr.23
Pr.27 Relay 5 Failsafe Used only on single point systems.
Options the same as Pr.23
Note: On Multipoint systems
Relays 1 and 2 are provided by the first Relay Module (if fitted) and Relays 3 and 4 by
the second Relay Module if fitted.
The fail-safe designation of each relay number must be the same for all points.
An indication of Loss of Echo at any point is available at Relay 3 on the Controller.
Pr.28 Analogue and Display Failsafe (Common to all points) (D=3)
Enter 1 - Low
2 - High
3 - Hold Value
Pr.29 Failsafe Time Delay (Common to all points) (D=600)
Enter value (in seconds) of the time allowed before the unit goes to selected fail-safe
positions.
Minimum value is 30 seconds.
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