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

Relay Status

High Alarm

Low Alarm

 

Fail-Safe High

ON

OFF

Fail-Safe Low

OFF

ON

Fail- Safe Hold

HOLD

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 Types

Relay 1,2,4,5 – NO (Form A)

Relay 3,6 – NO / NC (Form C)

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.

Relays

7ML19981FB06

MultiRanger 100/200 – INSTRUCTION MANUAL

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Siemens 200 instruction manual Relay States, Relay Related Parameters, Relay Status Non Run Modes, Relay Types