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Ndrive HL User’s Manual
4-12 www.aerotech.com
Suppression diodes must be installed on outputs that are used to drive relays or other
inductive devices to protect the output devices from being damaged by the inductive
spikes that occur when the device is turned off. Suppressor diodes can be installed on all
outputs to provide greater protection. The 1N914 diode is recommended for this
application. It is important that the diode be installed correctly (normally reversed
biased). See Figure 4-10 for an example of a current sinking output with diode
suppression and Figure 4-11 for an example of a current sourcing output with diode
suppression.
4.1.7. Opto-Isolated Inputs (TB305)
The inputs are configured for 5-24 volts DC logic, using a higher input voltage, requires
adding external series resistors to limit the current. The opto-isolator is a PS2
8
06-4
device. The inputs may be connected to current sourcing or current sinking devices, as
shown in Figure 4-12 and Figure 4-13. Each 4-bit bank of inputs (0-3 or 4-7) must be
connected to either all current sourcing or all current sinking devices. Also, note in the
table below, that inputs 0-3 and inputs 4-7 have two different common inputs, pin 1 and
pin 2, respectively. See Section 3.3.1 for opto-isolated EOT limit inputs.
Table 4-11.
Opto-Isolated Input Connector Pin Assignment (TB305)
Pin #
Label
Description
In/Out/Bi
1
C0-3
Input Common for inputs 0 - 3
Input
2
C4-7
Input Common for inputs 4 - 7
Input
3
Input 0
Input 0 (Optically-Isolated) – See pin 1
Input
4
Input 1
Input 1 (Optically-Isolated) – See pin 1
Input
5
Input 2
Input 2 (Optically-Isolated) – See pin 1
Input
6
Input 3
Input 3 (Optically-Isolated) – See pin 1
Input
7
Input 4
Input 4 (Optically-Isolated) – See pin 2
Input
8
Input 5
Input 5 (Optically-Isolated) – See pin 2
Input
9
Input 6
Input 6 (Optically-Isolated) – See pin 2
Input
10
Input 7
Input 7 (Optically-Isolated) – See pin 2
Input
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