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

EtherCAT ***EtherCAT is an open, high-performance Ethernet-based fieldbus system. The development goal of EtherCAT was to apply Ethernet to automation applications which require short data update times (also called cycle times) with low communication jitter (for synchronization purposes) and low hardware costs CoE and CANopen

Command	Index	SubIndex	Data Type	Units	Float Scale	Access	PDO PDO is a type of protocol frame used in some fieldbuses. A PDO contains one or more object dictionary entries, which define the application data transferred between devices. Mappable
AXIS1.MOTOR.CTF0	500bh	0eh	Unsigned32	-	1000:1	Read/Write	No
AXIS2.MOTOR.CTF0	510bh	0eh	Unsigned32	-	1000:1	Read/Write	No

EtherNet/IP

Name	ID	Hex	Data Type	Access	Units
AXIS1.MOTOR.CTF0	6203	183B	Unsigned32	Read Only	-
AXIS2.MOTOR.CTF0	71739	1183	Unsigned32	Read Only	-

PROFINET

Parameter	PNU	Data Type	Access	Units
AXIS#.MOTOR.CTF0	6203	Float	Read Only	-