Unitronics UniStream USC5-B5-TR22 Installation Manual page 11

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UniStream PLC
Increasing Contact Life Span
To increase the life span of the relay contacts and
protect the controller from potential damage by
reverse EMF, connect:
 a clamping diode in parallel with each inductive
DC load,
 a RC snubber circuit in parallel with each
inductive AC load
Wiring the Sink Transistor Outputs (USC-Bx-TR22)
 The outputs are not isolated.
N
OTE
 Connect a current limiting device in series with outputs O8 and O9. These outputs
are not short-circuit protected.
 Outputs O8 and O9 can independently be configured as either normal digital outputs
or as high speed PWM outputs.
 Outputs O8 and O9 share the common point CM4.
 CM4 is internally connected to the 0V point. To minimize EMI emission by high-speed
signals' wiring, do not externally connect CM4 to the system 0V.
 Do not use point CM4 for any purpose other than connecting the digital output
load. Using it for any other purpose may damage the controller.
Normal Transistor Output
Unitronics
v
High Speed PWM Output
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