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Relay status – Navigation View
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 Navigation View, 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.
•
Keep power disconnected at main breaker when HydroRanger 200 HMI cover
is opened.
Relay-related parameters
Some parameters affect how relays react during normal conditions:
Setpoints
When a setpoint is reached, the corresponding action is taken. The setpoint can be an
ON or OFF setpoint related to a process variable.
ON and OFF setpoints
Sets the process point at which the relay is activated (ON setpoint) then reset (OFF
setpoint). These setpoints are set separately for each pump within each pump control,
and for each alarm type.
2.8.1.3. Preset Applications
Sets the HydroRanger 200 HMI to a preset application. These preset applications quickly
set up the device with a minimum number of parameters.
2.8.1.4. Relay Function
Sets the default state differently, depending on whether the relay is programmed as an
alarm or a control.
The alarm function de-energizes the relay coils. During normal operation (no alarms), the
relay coils are energized.
The control function energizes the relay coils. When the instrument is at rest (no controls
operating) the relay coils are de-energized.
2.8.1.5. ON Setpoint
Sets the process point at which the relay is activated.
A5E36281317
High Alarm
HydroRanger 200 HMI – OPERATING INSTRUCTIONS
Relay status
Low Alarm
ON
OFF
HOLD
HOLD
OFF
ON
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Troubleshooting
