Technical data

34
• DOK-DIAX02-DDC01******-PRJ1-EN-E1,44 • 01.97
3. Electrical Connections - Installation Guidelines
3.15. Control Circuit of the DDC Mains Contactor with
E-Stop Relays
• if several E-stop switches are needed in larger installations or if, e.g., a
safety door monitor is required or
• if a synchronous motor (MDD) is connected to the DDC.
Dynamic braking always brakes synchronous motors to a standstill whether or
not the drives electronics are operational. The DC bus is only short-circuited
if there is a drive fault.
In the event of an emergency stop (E-stop) or a disconnect, the drives are
braked to a standstill at maximum torque by the drive electronics.
If the ON button is pressed, then K3 and K4 safely switch on mains contactor
K1. Should K3 or K4 fail, then power cannot be switched on.
If the E-stop button is pressed, then K3 and K4 safely switch off mains
contactor K1. The NC control unit of the machine must simutlaneously lockout
the drive enable (RF input with analog interface, E-stop input of a DEA 3 with
DLC single-axis postioning module). The command value of the drive is then
switched to zero.
A drive error signal from the Bb contact of the DDC, an error signal from the
controller (servo error), or an overtravelling of the limit switch disconnects the
mains contator and triggers dynamic braking.
The signal sequence as depicted in the diagram below is recommended for
commissioning the DDC.
Application
Features
Operating Principle
Input
signal
DC bus dynamic
brake
OFF
ON
UD contact
1)RF
2)CLEAR
Output
signal
1
0
1
0
1
0
1
0
1
0
E-stop
1
0
1
0
1
0
2) automatic
mode
t
1
t
3
t
3
t
3
t
4
t
4
t
4
t
4
t
4
t
3
t
5
t
5
2)START
t1 > 3 s; 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 modules.
2) Only applies to drives with DLC positioning modules
t
4
t
5
SVDDC03
t
1
Fig. 3.17: Signal path diagram for switching on a DDC