Danfoss VLT AutomationDrive EZ FC 321, Руководство по программированию

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Selection 0–20 mA 4–20 mA
Rated torque (0–T
nom
) [105] [135]
Power (0–P
nom)
[106] [136]
Speed (0–Speed
max
) [107] [137]
Option Name Description
[0]* Off Filter off.
[1] On Filter on.
4.8 Parameter Group 7-** Controllers
4.8.1 Speed PID Droop
This feature implements precise torque sharing between multiple motors on a common mechanical shaft. Speed PID droop is useful
for marine and mining applications where redundancy and higher dynamics are required. Speed PID droop allows to reduce inertia
by utilizing multiple small motors instead of 1 large motor.
e3
0b
e1
97
.1
1
Set-point
Calculation
External Set-point Ramp
Droop
Speed
PID
Torque
PID
M2
M3
Drive 2
Drive 3
Set-point
Calculation
Ramp
Droop
Speed
PID
-
Set-point
Calculation
Ramp
Droop
Speed
PID
Torque
PID
M1
Drive 1
-
-
Torque
PID
Illustration 63: Concept of Speed PID Droop
The value in parameter 7-01 Speed PID Droop ensures that the load is shared equally between the motors. If the torque on the motor
is 100% of nominal motor torque, the drive reduces its output to this motor by 100% of the value in parameter 7-01 Speed PID Droop .
If the torque is 50% of nominal motor torque, the drive reduces its output to this motor by 50% of the value in parameter 7-01 Speed
PID Droop . This ensures that the motors share the load evenly. A side effect of using speed PID droop is that the actual shaft speed
does not match the reference exactly. Speed PID droop is not efficient in low-speed applications because the adjustment range may
be insufficient.
AU373327181955en-000101 / 130R1208 188 | Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide