AXIS#.MOTOR.CTF0
Description
This parameter is used to configure the thermal constant of the motor coil, which is the break frequency of a single-pole low-pass filter model of the thermal dynamics of the motor coil.
This parameter, together with AXIS#.MOTOR.IPEAK and AXIS#.MOTOR.ICONT , determine the motor foldback (thermal protection) operating values.
Calculating AXIS#.MOTOR.CTF0
Most motor data sheets list the thermal time constant for the bulk motor, not specifically for the copper windings. There is about a 30:1 ratio of “bulk motor thermal time constant” to “copper winding (coil) thermal time constant (T)."
Therefore,
Bulk Motor Thermal Time Constant = T/30
Given a motor coil/winding thermal time constant T in seconds, then:
AXIS#.MOTOR.CTF0 mHz = 1000/(2πT/30)
For a bulk motor time constant in minutes:
AXIS#.MOTOR.CTF0 mHz = 1000/(2πT/180)
Given a bulk motor Thermal Time Constant, TCT, in seconds, then:
MOTOR.CTF0 = 1000 / (2π * TCT / 30)
The factor of 30 comes into play, since the coil or winding thermal time constant for Kollmorgen AKM motors is generally 30 times faster than the bulk motor thermal time constant.
-
- This parameter is automatically configured for Kollmorgen motors when AXIS#.MOTOR.AUTOSET = 1 and can be modified while AXIS#.MOTOR.AUTOSET = 1 if its AXIS#.MOTOR.DISAUTOSET index = 1.
Context
For more information see Motor.
Versions
| Action | Version | Notes |
|---|---|---|
| Implemented | 02-00-00-000 |
General Information
|
Type |
Read/Write |
|
Units |
mHz |
|
Range |
0.265 to 16,000 |
|
Default Value |
10 |
|
Data Type |
Float |
|
See Also |
N/A |
|
Stored in Non-Volatile Memory |
Yes |
Variants Supported
All variants are supported.
Fieldbus Information
|
Command |
Index |
SubIndex |
Data Type |
Units |
Float Scale |
Access |
PDO Mappable |
|---|---|---|---|---|---|---|---|
|
AXIS1.MOTOR.CTF0 |
500bh |
0eh |
Unsigned32 |
- |
1000:1 |
Read/Write |
No |
|
AXIS2.MOTOR.CTF0 |
510bh |
0eh |
Unsigned32 |
- |
1000:1 |
Read/Write |
No |
|
Name |
ID |
Hex |
Data Type |
Access |
Units |
|---|---|---|---|---|---|
|
AXIS1.MOTOR.CTF0 |
6203 |
183B |
Unsigned32 |
Read Only |
- |
|
AXIS2.MOTOR.CTF0 |
71739 |
1183 |
Unsigned32 |
Read Only |
- |
|
Parameter |
PNU |
Data Type |
Access |
Units |
|---|---|---|---|---|
|
AXIS#.MOTOR.CTF0 |
6203 |
Float |
Read Only |
- |
