Parameter Group 40-** Special Settings; Pm Motor Specific - Danfoss VLT AutomationDrive EZ FC 321 Programming Manual

VLT® AutomationDrive EZ FC 321
Programming Guide
Parameter 31-10 Bypass Status Word
Table 726: Parameter 31-10 Bypass Status Word
31-10 Bypass Status Word
Default Value: 0
Conversion Index: 74
View the status of the bypass as a hexadecimal value.
Parameter 31-11 Bypass Running Hours
Table 727: Parameter 31-11 Bypass Running Hours
31-11 Bypass Running Hours
Default Value: 0 h
Conversion Index: 74
View the number of hours in which the motor has run in bypass mode. The counter can be reset in parameter 15-07 Reset Running
Hours Counter. The value is saved when the drive is turned off.
Parameter 31-19 Remote Bypass Activation
Table 728: Parameter 31-19 Remote Bypass Activation
31-19 Remote Bypass Activation
Default Value: [0] Disabled
Conversion Index: -
Option
[0]*
[1]

4.22 Parameter Group 40-** Special Settings

4.22.1 40-2* PM Motor Specific

Parameter 40-28 Back EMF Protection
Table 729: Parameter 40-28 Back EMF Protection
40-28 Back EMF Protection
Default Value: [1] Enabled
Conversion Index: -
The drive is protected by default from Back EMF, which can be generated by IPM or SPM motor types due to calculated speed limita-
tion. The actual limitation is based on parameter 1-40 Back EMF at 1000 RPM and protects the drive from motor-generated overvolt-
age.
By disabling the speed limitation, a risk of destructive effect on the IGBTs can be encountered when the drive loses the motor. If
the function is disabled, ensure to protect the drive by other means to prevent motor-generated overvoltage.
342 | Danfoss A/S © 2021.08
Parameter Type: Range, 0 - 65535
Data Type: V2
Parameter Type: Range, 0 - 2147483647 h
Data Type: Uint32
Parameter Type: Option
Data Type: Uint8
Name
Disabled
Enabled
Parameter Type: Option
Data Type: Uint8
C A U T I O N
Parameter Descriptions
Setup: All set-ups
Change during operation: False
Setup: All set-ups
Change during operation: False
Setup: 2 set-ups
Change during operation: True
Description
Setup: All set-ups
Change during operation: False
AU373327181955en-000101 / 130R1208