Rockwell Automation Publication 22C-UM001J-EN-E - January 2017 167
Application Notes Appendix D
Example 2
Figure 42 - One External Motor with AutoSwap
(1) Mechanically interlocked contactors are recommended to ensure that the drive contactor and the line contactor do not close at
the same time. If the drive and line contactor close at the same time, drive damage may result.
• Auxiliary Motor Control is enabled via Parameter R239 [Aux Motor
Mode].
• Number of auxiliary motors is set via Parameter R240
[Aux Motor Qty].
• Relays are configured for Auxiliary Motor Control via parameters T055
,
T060
, R222, R225, R228, R231, R234, and R237.
• The frequency of Motor #1 that Motor #2 turns on at is set via
Parameter R241
[Aux 1 Start Freq].
• The time that Motor #1 is above the value set by R241
[Aux 1 Start
Freq] before turning on Motor #2 is set via Parameter R250
[Aux Start
Delay].
• The frequency of Motor #1 that Motor #2 turns off at is set via
Parameter R242
[Aux 1 Stop Freq].
• The time that Motor #1 is below the value set by R242
[Aux 1 Stop
Freq] before turning off Motor #2 is set via Parameter R251
[Aux Stop
Delay].
• PID setup is done via Parameters A150
through A159.
• The maximum PID output level that an AutoSwap can occur is set via
Parameter R254
[Aux AutoSwap Lvl]. AutoSwap will be delayed until
the PID output drops below this parameter setting.
IMPORTANT If using auxiliary motor control, ensure that wiring and parameter
configuration are correct before wiring contactor outputs. All relays on the
Auxiliary Relay Card will energize on power-up by default. Failure to verify
proper wiring and parameter configuration can result in improper motor
operation or drive damage.
PID
Reference
Feedback
Drive Relays
Auxiliary Relay Card
M1D M1L M2D M2L
PowerFlex 400
Three-Phase Power
M1D
M1L
M2D
M2L
M1 M2
(1) (1)
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