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Relay Status – Non Run Modes
When the fail-safe timer expires, pump control relays respond as previously described.
However, alarm relays will respond in the following manner:
Fail-Safe Mode
Fail-Safe High
Fail-Safe Low
Fail- Safe Hold
Upon entering the program mode, all pump control relays will be turned OFF. Alarm relays
will hold their prior status.
Cautions:
•
If the relay status can affect plant operation or personnel safety, it is advisable
to override the relay functions or disconnect the relay wiring during calibration
or simulation.
•
Keep power disconnected at main breaker when MultiRanger cover is opened.
Relay States
The relays on the MultiRanger are completely programmable, allowing for any control
scheme.
Relay Related Parameters
Some parameters affect how relays react during normal conditions:
P100–Preset Applications [MR 200 only]
Sets the MultiRanger to a preset application. These preset applications quickly set up the
MultiRanger with a minimum number of parameters.
P111–Relay Control Function
Sets the default state differently, depending on whether the relay is programmed as an
alarm or a control.
P111–Alarm Functions
The alarm function de-energizes the relay coils. During normal operation (no alarms), the
relay coils are energized.
Page 42
MultiRanger 100/200 – INSTRUCTION MANUAL
Relay Status
High Alarm
ON
OFF
HOLD
Relay Types
Relay 1,2,4,5 – NO (Form A)
Relay 3,6 – NO / NC (Form C)
Low Alarm
OFF
ON
HOLD
7ML19981FB05
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