52 HEIDENHAIN Technical Manual MANUALplus 620
1.3 NC Software 548 328-04
1.3.1 Important change made in the technical manual
In older editions of the present documentation, an incorrect assignment for
the X394 terminal (connection of the motor holding brakes) was printed for the
UEC 11x connection description (See "X394: Motor holding brakes" on page
210):
Incorrect assignment for X394:
Corrected assignment for X394:
If the motor holding brakes are wired as per the incorrect connection layout,
this could lead, for example, to the brake for the Z axis incorrectly being wired
to the brake output of the Y axis. Since the motor brakes are generally
commanded as a group via the PLC (see the basic circuit diagram), incorrect
wiring of X394 should have no negative effect on the behavior of the machine.
Connecting terminals Assignment
1 Holding brake 1 (X81)
20 V PLC
3 Holding brake 2 (X82)
40 V PLC
5 Holding brake 3 (X83)
60 V PLC
7 Holding brake 4 (X84)
80 V PLC
Connecting terminals Assignment
1 Holding brake X80
20 V PLC
3 Holding brake X81
40 V PLC
5 Holding brake X82
60 V PLC
7 Holding brake X83
80 V PLC
9 Holding brake X84
10 0 V PLC
Please check the wiring of the motor holding brakes of your machine
if you use output X394 of the UEC11x.
If necessary, change the assignments of the terminal as per the
corrected layout.
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