Compax3 device description
50
192-120102 N7 - February 2004
Channel 2:
After the delay time set in the Emergency power-off module, (this time
must be set so that all drives are stopped after it has elapsed) the contacts
between 57 and 58 open, which in turn deactivates the Enable inputs of the
Compax3 devices.
Channel 2 feedback:
Power is only supplied to the K3 relay via the series circuit of
the Feedback contacts if all Compax3's are currentless: "Safe standstill“ state
reached.
Now the safety door can be opened and access to the hazardous area is possible.
After the safety door is opened, the safety door monitor opens its contacts.
Mains power continues to be supplied to Compax3 devices if the K3 relay is
receiving current (so that current is supplied to K1) and the "Safe Standstill" is thus
acknowledged.
Case 2: Opening the safety door directly
After the safety door is opened, the safety door monitor opens its contacts.
The supply of mains power is disconnected by the safety door monitor.
After the storage capacity of the power DC bus is used up, the motors gradually
come to a standstill.
Caution! The mains power voltage is turned on again by the feedback from
Channel 2, since the feedback contacts are closed in the basic state. A "Safe
Standstill" is nevertheless still ensured after the motors have come to a standstill.
Function of the K1 relay
The effect of the K1 relay in the event of a fault is as follows: If the Feedback
contact (Channel 2 feedback) cannot be closed because of a defective Compax3
device, the supply of mains power is interrupted when the safety door is open
(safety door monitor contacts open; no feedback via Channel 2).
