Figure 12. Bandwidth Feedback - Eaton PowerXL DM1 Series Applications Manual

Chapter 7- Multi-purpose application

Figure 12. Bandwidth feedback.

On
Interlock 4
Off
On
Interlock 3
Off
Interlocks
On
Interlock 2
Off
On
Interlock 1
Off
On
Off
On
Off
Relay Control
On
Off
On
Off
Max Freq
Staging
Freq
Main Drive
Output
Frequency
De-staging
Freq
Min Freq
f
PID
Bandwidth
PID 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.
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POWERXL DM1 SERIES VARIABLE FREQUENCY DRIVES MN040049EN—September 2021 www.eaton.com
Setpoint
Feedback
Add/Remove Add/Remove Add/Remove
Delay Delay
3
1 2
Aux. 3 Running
Aux. 2 Running
Aux. 1 Running
Main Drive Running
Add/Remove
Delay Delay
4 5
Add/Remove Add/Remove
Delay Delay
6 7
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