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Ndrive HP 10/20/30 User’s Manual
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Figure 4-9.
Connecting Outputs in Current Sinking Mode
Figure 4-10.
Connecting Outputs in Current Sourcing Mode
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 4-9 for an example of a current sinking output with diode
suppression and Figure 4-10 for an example of a current sourcing output with diode
suppression.
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