Ndrive FCL Hardware Manual
Installation and Configuration
2.8.2. Digital Outputs (TB102 A)
The digital outputs are optically-isolated and may be connected in sourcing or sinking configurations. The
digital outputs are designed to connect to other ground referenced circuits and are not intended to provide
high-voltage isolation.
Outputs must be connected in either all sinking or all sourcing mode.
and
illustrate
how to connect to an output in current sinking and current sourcing mode, respectively.
The opto-isolator's common connections can be directly connected to the drive's power supply; however,
doing so will effectively defeat the isolation and will reduce noise immunity.
N O T E :
The outputs are protected by resettable thermal fuses. If there is an overload, removing the
overload will reset the fuse.
Table 2-30:
Digital Output Pins on the TB102 A Connector
Pin #
Label
Description
In/Out/Bi
1
DO0
Digital Output 0 (Optically-Isolated)
Output
2
DO1
Digital Output 1 (Optically-Isolated)
Output
3
DO2
Digital Output 2 (Optically-Isolated)
Output
4
DO3
Digital Output 3 (Optically-Isolated)
Output
5
DOC
Digital Output Common
Input
Table 2-31:
Digital Output Specifications
Opto Device Specifications
Value
Maximum Voltage
24 V Maximum
Maximum Sink/Source Current
50 mA/output
Output Saturation Voltage
0.3 V at maximum current
Rise / Fall Time
250 usec (2K pull up to 24V)
Reset State
Output Off (High Impedance State)
Suppression diodes must be installed on outputs driving relays or other inductive devices. This protects the
outputs from damage caused by inductive spikes. Suppressor diodes, such as the 1N914, can be installed
on all outputs to provide protection. It is important that the diode be installed correctly (normally reversed
biased). Refer to
for an example of a current sinking output with diode suppression and
for an example of a current sourcing output with diode suppression.
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Chapter 2
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