Eaton PowerXL DM1 Series - Figure 12. Bandwidth Feedback

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Chapter 7- Multi-purpose application
POWERXL DM1 SERIES VARIABLE FREQUENCY DRIVES MN040049EN—September 2021 www.eaton.com
Figure 12. Bandwidth feedback.
1. Feedback out of bandwidth, output frequency over staging frequency, start delay counter; delay times out,
and interlock 2 is OK, add aux. 1 motor by closing its corresponding relay.
2. As above, add aux. 2 motor.
3. Aux. 2’s interlock lost, add aux. 3 as backup immediately.
4. Add aux. 2 motor again since its interlock resumed.
5. Feedback out of bandwidth, output frequency below de-staging frequency, start delay counter; delay times out,
remove aux. 2 motor first because it’s the last one which been added.
6. As above, remove aux. 3 motor.
7. As above, remove aux. 1 motor.
Interlock 4
Interlocks
Relay Control
Main Drive
Output
Frequency
Max Freq
Staging
Freq
De-staging
Freq
Min Freq
f
PID
Bandwidth
Setpoint
Feedback
Aux. 3 Running
Aux. 2 Running
Aux. 1 Running
Main Drive Running
Add/Remove
Delay
1 2
3 4 5 6 7
t
Add/Remove
Delay
Add/Remove
Delay
Add/Remove
Delay
Add/Remove
Delay
Add/Remove
Delay
PID Feedback
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
On
Off
Interlock 3
Interlock 2
Interlock 1