Setting Relay Activation Limit Using Hysteresis - INDIGO200SERIES - INDIGO202

Indigo 202 User Guide

Document code
M211966EN
Revision
C
Language
English (United States)
Product
INDIGO200SERIES
INDIGO202
Document type
User guide

If the measurement you are using to control the relay is likely to move back and forth close to the activation setpoint, you can set a hysteresis that prevents the relay switching on and off too frequently.

When hysteresis is used, the relay activates at the defined limit, but does not switch off immediately when the measurement moves back to the other side of the activation limit. Instead, with hysteresis, the relay remains active until the measurement reaches the defined tolerated variation limit.

To set a relay activation limit with hysteresis:
  1. Open the Settings > Relays menu in the wireless configuration interface.
  2. In the Relays menu, select the relay activation mode from the Output Mode dropdown menu:
    1. Select Active above trigger level if you want the relay to activate when the probe measurement exceeds a set limit
    2. Select Active below trigger level if you want the relay to activate when the probe measurement falls below a set limit
  3. Select the measurement parameter that is used to control the relay with the Parameter dropdown.
  4. Set the unit of the measurement parameter with the Unit dropdown.
  5. Enter the relay activation limit either to the Low Trigger Level or the High Trigger Level field:
    1. If you are using Active above trigger level (relay activation when the measurement exceeds a set limit), enter the limit to the High Trigger Level field.
    2. If you are using Active below trigger level (relay activation when the measurement falls below a set limit), enter the limit to the Low Trigger Level field.
  6. To define the hysteresis value:
    1. If you are using Active above trigger level, enter the limit for tolerated variation below the setpoint to the Low Trigger Level field.
      With this option, the relay activates when the measurement exceeds the limit entered in High Trigger Level, and switches off when the measurement falls below the limit entered in the Low Trigger Level field.
    2. If you are using Active below trigger level, enter the limit for tolerated variation above the setpoint to the High Trigger Level field.
      With this option, the relay activates when the measurement falls below the limit entered in Low Trigger Level, and switches off when the measurement exceeds the limit entered in the High Trigger Level field.
  7. Select the Error State for the relay.