7ML19985FC03 HydroRanger 200 – INSTRUCTION MANUAL Page 41
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Relays
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:
Upon entering the program mode, all pump control relays will be turned OFF. Alarm relays
will hold their prior status.
Relay States
The relays on the HydroRanger 200 are completely programmable, allowing for any
control scheme.
Relay Related Parameters
Some parameters affect how relays react during normal conditions:
P100–Preset Applications [6 relay model]
Sets the HydroRanger 200 to a preset application. These preset applications quickly set
up the HydroRanger 200 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.
Fail-Safe Mode
Relay Status
High Alarm Low Alarm
Fail-Safe High ON OFF
Fail-Safe Low OFF ON
Fail- Safe Hold HOLD HOLD
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 HydroRanger 200 cover is
opened.
Relay Types
Relay 1,2,4,5 – NO (Form A)
Relay 3,6 – NO / NC (Form C)
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