Pepperl+Fuchs HID2891 Manual page 37

Frequency Converter HiD2891

Entering parameters:

In the Output dialog window, open Relay Output 1 or Transistor Output.

Set the parameters for the selected output.
Relay output 1 and Transistor output together make 3 different functions available:
• Trip mode:
The following parameters can be set:
− Switching point and hysteresis for the relay. The unit is indicated according to the selection
made for the Input parameter (see section 6.3.3). The hysteresis should be selected > 1% of
the measuring range to prevent the relay from fluttering.
− Switching direction (MAX or MIN) and mode of operation (active or inactive) for the relay
− Alarm freeze: If alarm freeze is deselected, the relay state remains intact after a limit is
exceeded or an error message is generated. It can only be reset by restarting the device.
Switching behavior of the relays
• MIN or MAX can be set as the switching direction. The mode of operation can be energized (active)
or de-energized (inactive).
Application ranges (see illustration on page 36):
− Switching direction MAX, mode of operation energized (active):
- Alarm when limit value is exceeded, for example horn on
- Protection against excess speed, for example brake on
− Switching direction MAX, mode of operation de-energized (inactive):
- Protection against excess speed, for example motor off
- MIN-MAX operation with large hysteresis, for example motor on/off
− Switching direction MIN, mode of operation energized (active):
- Alarm for trip underrange, for example horn on
- Protection against speed too low, for example motor on
− Switching direction MIN, mode of operation de-energized (inactive):
- Protection against speed too low, for example brake off
- MIN-MAX operation with large hysteresis, for example motor off/on
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