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.

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 CoE and CANopen

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
EtherNet/IP

ID

Instance

Attribute

Name

Data Type

Access

User Mappable

6203

1

6203 (0x183b)

AXIS1.MOTOR.CTF0

Unsigned32

Read Only

Yes

71739

2

6203 (0x183b)

AXIS2.MOTOR.CTF0

Unsigned32

Read Only

Yes
PROFINET

Parameter

PNU

Data Type

Access

Units

AXIS#.MOTOR.CTF0

6203

Float

Read Only

-