Installation/Wiring 1-13
If drives with internal precharge are used with a disconnect switch to the
common bus, then an auxiliary contact on the disconnect must be
connected to a digital input of the drive. The corresponding input
(parameter A051-A054) must be set to option 29, “Precharge Enable.”
This provides the proper precharge interlock, guarding against possible
damage to the drive when connected to a common DC bus.
Motor Start/Stop Precautions
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 “Common” are
not referenced to the
safety ground (PE) terminal and are designed to greatly
reduce common mode interference.
Common Bus/Precharge Notes
I/O Wiring Recommendations
ATTENTION: A contactor or other device that routinely disconnects
and reapplies the AC line to the drive to start and stop the motor can
cause drive hardware damage. The drive is designed to use control input
signals that will start and stop the motor. If used, the input device must
not exceed one operation per minute or drive damage can occur.
ATTENTION: The drive start/stop control circuitry includes
solid-state components. If hazards due to accidental contact with
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.
ATTENTION: Driving the 4-20mA analog input from a voltage
source could cause component damage. Verify proper configuration
prior to applying input signals.
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