Technical data

32
• DOK-DIAX02-DDC01******-PRJ1-EN-E1,44 • 01.97
3. Electrical Connections - Installation Guidelines
3.14. Control circuit of the DDC Mains Contactor
Without Dynamic Braking
• if an inductance motor is mounted to a DDC ( 2AD; 1MB; LAF; LAR )
• if uncontrolled coasting cannot damage the installation.
The DC bus is not short-circuited. There can be no controlled braking of
inductance drives if the DC bus is short-circuited.
The drives are braked by the drive electronics at maximum torque for an E-stop
or a power disconnect.
If the E-stop sequence is triggered, then K3 and K4 safely switch off mains
contactor K1. The NC control unit of the machine simultaneously locks out the
drive enable (RF input with analog interface, E-stop input of a DEA with a DLC
single-axis positioning module). The command value of the drive is switched
to zero. There is a controlled braking of the drive.
Application
Features
Operational principle
The drives coast uncontrolled with a fault in the drive electronics. The
short circuiting of the DC bus can only be dispensed with if a coasting
of the drives cannot damage the facility. Motors with mechanical
holding brakes can be used as an alternative.
The signal sequence depicted in the diagram below is recommended.
Fig. 3.15: Signal path diagram for switching on a DDC
Input
signal
OFF
ON
UD contact
1)RF
2)CLEAR
Output
signal
1
0
1
0
1
0
1
0
E-stop
1
0
1
0
1
0
2) automatic
mode
t
2
t
3
t
3
t
4
t
4
t
4
t
4
t
3
t
5
t
5
2)START
t1> 3 s; t2 > 100 ms; t3 > 10 ms; t4 >= 20 ms; t5 > 0.3 s
1) Drive enable signal in drives with analog interface or E-stop
input in drives with DLC positioning module.
2) Applies only to drives with DLC positioning modules.
SVDDC02
t
1
t
1
t
2