36 Rockwell Automation Publication 520-UM001I-EN-E - July 2016
Chapter 1 Installation/Wiring
Common Bus/Precharge
Notes
If drives are used with a disconnect switch to the common DC bus, then an
auxiliary contact on the disconnect must be connected to a digital input of the
drive. The corresponding input (parameter t062
, t063, t065...t068 [DigIn
TermBlk xx]) must be set to 30, “Precharge En” This provides the proper
precharge interlock, guarding against possible damage to the drive when
connected to a common DC bus. For more information, see Drives in Common
Bus Configurations, publication DRIVES-AT002
.
I/O Wiring
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 m (1 ft).
Signal and Control Wire Types
Recommendations are for 50 °C ambient temperature.
75 °C wire must be used for 60 °C ambient temperature.
90 °C wire must be used for 70 °C ambient temperature.
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. Alternatively, use the drive’s safety input function.
I/O terminals labeled “Common” are not referenced to the safety ground (PE)
terminal and are designed to greatly reduce common mode interference.
ATTENTION: Driving the 4-20 mA analog input from a voltage source could
cause component damage. Verify proper configuration prior to applying input
signals.
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