Remedied from:
ECS power supply module ECSxE series, operating software V3.0
Behaviour of new version?
The control of the charging thyristor has been set less sensitive with reference to disturbances of the mains synchronisation. As a result, the charging current set for the DC bus can now be reached safely. Therefore, the charging times after power supply enable are as far as possible independent of the noises in case of non-rigid mains.
Which products are affected?
ECS power supply module ECSxE series, operating software V2.3
What happens?
Due to mains disturbances the charging current for the DC bus via the charging thyristor does not reach the value defined under C0022. Therefore, the time required for the charging process after power supply enable can considerably be prolonged compared to the normal status.
When does the problem occur?
Mains disturbances which especially occur in case of non-rigid mains can affect the mains synchronisation of the ECS power supply module. As a result, the firing of the charging thyristor is not activated in some mains periods. Therefore, the charging current set under C0022 is not reached.
Possible diagnostics?
Measure the time between switching the power supply enable (DI1) and switching the output DO1. Regarding this, it is to be observed that input DI2 is set to HIGH before in order to ensure that output DO1 switches.
Short-term measures/recommendations?
The best remedy is to eliminate the mains disturbances.
If necessary the setpoint for the charging current can be increased under C0022 or, if possible, simply accept a prolonged charging time.
Evaluation:
If the controller enable signals of the ECS axes are connected correspondingly via the output DO1 of the ECS power supply module, it can be ensured despite the prolonged charging time that the ECS axes do not draw energy from the DC bus too early.
Published with service message No. 2007/26 und 2007/28
