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Digitax HD M75X Series Installation and Technical Guide 73
Issue Number: 5
Figure 4-26 Surge suppression for analog and bipolar inputs and outputs
Surge suppression devices are available as rail-mounting modules, e.g. from Phoenix Contact:
Unipolar TT-UKK5-D/24 DC
Bipolar TT-UKK5-D/24 AC
These devices are not suitable for encoder signals or fast digital data networks because the capacitance of the diodes adversely affects the signal.
Most encoders have galvanic isolation of the signal circuit from the motor frame, in which case no precautions are required. For data networks, follow
the specific recommendations for the particular network.
4.11 Control terminals
The control circuits are isolated from the power circuits in the drive by reinforced insulation.
Figure 4-27 Default control terminal functions
1. Polarized signal connections.
* The Safe Torque Off / Drive enable terminal is a positive logic input only
Signal from plant Signal to drive
0V 0V
2 x 15V zener diode
e.g. 2xBZW50-15
0 V common
1
2
3
4
5
6
7
Digital Output 1
Run forward
Run reverse
Safe Torque Off
Input 1*
0 V common
+24 V / Digital Output 3
11
12
13
Safe Torque Off
Input 2*
Digital Output 2
0 V common
0 V common
0 V common
0V common
9
10
8
14
15
16
0 V common
1
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