Current limitation, switching the load circuits off
The switch-off behavior of the individual load circuits can be adapted to the application.
The following modes can be set individually for each channel:
- Very fast acting
- Fast acting
- Slow acting
- Time delay
Release time (switch-off time) of the modes
|
Nominal current |
Very fast acting |
Fast acting |
Slow acting |
Time delay |
|---|---|---|---|---|
|
100 % |
1 h |
- |
- |
- |
|
110 % |
1 h |
4 h |
- |
- |
|
120 % |
7 min |
4 h |
- |
- |
|
150 % |
30 s |
30 min |
1 h |
4 h |
|
210 % |
500 ms |
20 s |
20 s |
100 s |
|
275 % |
500 ms |
1 s |
20 s |
10 s |
|
300 % |
20 ms |
100 ms |
1 s |
3 s |
The release time depends on the set nominal current.
Following the switch-off of a channel it is necessary to reactivate it after rectification of the cause of the error.
Switch-off of the box due to overtemperature
The EP92x4 is internally protected against overheating. A warning is shown in the process data if a temperature of 75 °C is reached; the warning is reset at a value of <73 °C.
On reaching 85 °C all load circuits are switched off in order to protect the hardware against destruction. In this case the Temperature Error bit is set.
So that the permitted temperature is not exceeded, the Box is to be mounted with its rear panel on the flattest possible thermally conductive surface.
Switching the Box on again following an overtemperature error
The error can only be reset via the Global Error Bit when the temperature has fallen below 73 °C and the warning is thus extinguished. The Error Bit is not saved and is reset by a Power Cycle.
Switch off of the box due to undervoltage
Since undervoltage impairs the function of the safety mechanisms, a warning is given in the process data from an input voltage of 21.5 V. If the voltage Up falls below 18 V, all Up outputs are switched off and the Error bit is set.
Us and Up outputs are switched off in case of undervoltage of Us.
In the factory default setting, this error persists until a PowerCycle OR global reset takes place. An automatic error acknowledgment can be enabled on Up with the entry F80E:05 in the CoE. This is useful if UP is only switched on after successfully starting up the system.
Undervoltage is detected independently for Us and Up.
 | Switching on again Switching off due to undervoltage and overtemperature is equivalent to the response of the current monitoring, but applies to the entire box and all outputs. In order to acknowledge the error, it is necessary to set the process data GLOBAL RESET or to switch the module off and on again, in addition to which the temperature must have fallen below 73 °C! |
Switching load circuits on again after switch-off
This takes place either via the process data by EtherCAT or via the Reset input (if existent) directly on the Box.