I/O Wiring - Allen-Bradley PowerFlex 70 User Manual

1-10 Installation/Wiring

I/O Wiring

Motor Start/Stop Precautions
ATTENTION: A contactor or other device that routinely disconnects
and reapplies the AC line to the drive to start and stop the motor can
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cause drive hardware damage. The drive is designed to use control input
signals that will start and stop the motor. If an input device is used
occasionally, an auxiliary contact on that device should also be wired to
a digital input programmed as an "Enable" function. The input device
must not exceed one operation per minute or drive damage will occur.
ATTENTION: The drive start/stop control circuitry includes
solid-state components. If hazards due to accidental contact with
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moving machinery or unintentional flow of liquid, gas or solids exist,
an additional hardwired stop circuit may be required to remove the AC
line to the drive. When the AC line is removed, there will be a loss of
any inherent regenerative braking effect that might be present - the
motor will coast to a stop. An auxiliary braking method may be
required.
Important points to remember about I/O wiring:
• Always use copper wire.
• Wire with an insulation rating of 600V or greater is recommended.
• Control and signal wires should be separated from power wires by at
least 0.3 meters (1 foot).
Important: I/O terminals labeled "(–)" or "Common" are not
ATTENTION: Configuring an analog input for 0-20mA operation and
driving it from a voltage source could cause component damage. Verify
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proper configuration prior to applying input signals.
ATTENTION: Hazard of personal injury or equipment damage exists
when using bipolar input sources. Noise and drift in sensitive input
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circuits can cause unpredictable changes in motor speed and direction.
Use speed command parameters to help reduce input source sensitivity.
referenced to earth ground and are designed to greatly
reduce common mode interference. Grounding these
terminals can cause signal noise.