All protection set points are a percentage of the nominal values.
For most of the protections a set point and time delay is selected. When the timer runs out, the output is activated. The operate time is the delay setting + the reaction time.
When setting up the controller, the measuring class of the controller and an adequate
safety margin has to be taken into consideration, for example:
- A power generation system must not reconnect to a network when the voltage is < 85 % of UNOM ±0 % or > 110 % ±0 %. To ensure reconnection within this interval, the controller’s tolerance/accuracy has to be taken into consideration. If the reconnection tolerance is ±0 %, set a controller’s set points 1-2 % higher/lower than the actual set point.
General parameter ranges for protections
| Setting | Range |
|---|---|
| Output A |
Not used 12 relays: 5, 6, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 External I/O: Relays available in the connected CIO(s) Limits |
| Output B | |
| Enable |
OFF ON |
| Fail class | See the controller type |
Inhibits
You can only select inhibits using the utility software. Each alarm has a selection list for the inhibit conditions. Inhibit of the alarm is active as long as one of the selected inhibit functions are active.