HIMA HIMax X-DO 32 01 - Short-Circuit Monitoring; Recommended Values for Line Monitoring

X-DO 32 01 4 Start-up
HI 801 097 E Rev. 4.00 Page 33 of 52
4.3 Short-Circuit Monitoring
The module is provided with short-circuit monitoring which can be individually configured for
each channel. The switching thresholds for short-circuit monitoring are predefined (see
Chapter
Table 8)
The following points must be taken into account for short-circuit monitoring:
 Line monitoring reliably detects a short-circuit (SC) when currents exceed 0.8 A.
 If an actuator is redundantly connected to two modules, line monitoring reliably detects a
short-circuit when currents exceed 1.6 mA.
Short-circuit monitoring can be configured for each channel as follows:
 In the I/O Submodule DO32_01 tab, adopt the setting SC Interval [µs] (≥ 40 ms) for all
channels
 In the I/O Submodule DO32_01: Channels, activate SC active,
Default setting: Deactivated
 In the I/O Submodule DO32_01: Channels, max. Test Pulse Duration 0 µs...50 ms,
if SC active (activated)
4.3.1 Recommended Values for Line Monitoring
Test Impulse Duration SC Interval Relationship
200 µs 40 ms 0.5 %
1 ms 200 ms 0.5 %
10 ms 2 s 0.5 %
20 ms 4 s 0.5 %
50 ms 10 s 0.5 %
Table 16: Relationship between Test Pulse Duration and SC Interval
For actuators, a pulse-duty factor of 0.5 % between the SC interval and the test impulse
duration has provided good results in practice. The value for the test impulse duration must
always be lower than the value for the SC interval.
Short-circuit monitoring does not affect the statuses Channel OK, Submodule OK and
Module OK, see Chapter
4.4.