6
Alarm relay and brightness level settings
The rear pushbuttons are used to set the alarm relays and display brightness levels. The rear DIP
switch 4 must be in the OFF position to allow the alarm relays and brightness levels to be set.
6.1
Alarm relays
A high alarm or a low alarm setting can be stored for each relay. The number of times the bargraph
flashes during setup indicates the relay being set. The bargraph illuminated indicates which input
will activate the relay e.g. 3 fast flashes followed by a blank on Channel 2 bargraph indicates relay 3
will operate from Channel 2 if this position is stored. When the required setting has been achieved
press the
F
button to store in memory.
If a low alarm is set the relay will close when the display reaches or falls below the level set and will
open when the display rises above the level set. If a high alarm is set the relay will close when the
display reaches or is above the the level set and will open when the display falls below the level set.
Note: the 3 relay option is fitted with changeover relays which allows a choice of normally open
and normally closed connections. The single relay and 6 relay options are normally open operation.
All relays are voltage free. A hysteresis or ”deadband” of one half of a display segment exists to
avoid relay chatter around the setpoint. e.g. if a relay has a low alarm of 50% then the relay will
activate at 50% or below but will not reset until the input is half a segment above 50%.
Refer to section
1.2
for details of how to access the setup functions for relay and brightness adjust-
ment. The procedure in section
1.2
must be followed before proceeding to the steps below.
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