Command Descriptions
91
DMTTCM
Motor Thermal Time Constant
Type
Motor
Syntax
<a_><!>DMTTCM<r>
(does not take effect until RESET, DRESET or
cycle power)
Units
r = minutes
Range
0.0 to 300.0 : ±0.1
Default
0.0
Response
DMTTCM:
*DMTTCM30.4
See Also
DMTR,
DMTTCW
Product Rev
GT6K n/a
GV6K 6.0
(applicable only to
servo axes)
NOTE
: This command does not take effect until you cycle power to the drive, or issue a
RESET
or
DRESET
command.
AUTO-SETUP
:
This command is automatically set according to the Parker motor selected with the
configuration utility in Motion Planner (see page
6
). If you did not use the configuration utility or are not using a
Parker Motor, this command is set to zero and you will have to manually set this parameter. (Refer to
DMTR
for a list of auto-configured commands.)
The
DMTTCM
command specifies the thermal time constant of the motor and its mounting. This value is
used to help protect the motor from thermal damage. It describes the length of time the motor takes to reach
63% of it’s final temperature, given constant power. Note that motor mounting will affect this.
Continuous current ratings and published time constants for Parker motors are specified when mounted to a
10" x 10" x ¼" aluminum plate in 25
°
C free air. If your mounting surface provides heatsinking or thermal
mass significantly different than this, a different value may be appropriate to your application. Note also
that the time constant of the motor winding itself (
DMTTCW
) is much faster than this; therefore, the rise in
winding temperature will initially be much faster than
DMTTCM
would suggest.
DMTTCW
Motor Winding Time Constant
Type
Motor
Syntax
<a_><!>DMTTCW<r>
(does not take effect until RESET, DRESET or
cycle power)
Units
r = minutes
Range
0.00 to 100.00 : ±0.01
Default
0.00
Response
DMTTCW:
*DMTTCW28.40
See Also
DMTMAX, DMTR, DMTTCM, DMTRWC
Product Rev
GT6K n/a
GV6K 6.0
(applicable only to
servo axes)
NOTE
: This command does not take effect until you cycle power to the drive, or issue a
RESET
or
DRESET
command.
AUTO-SETUP
:
This command is automatically set according to the Parker motor selected with the
configuration utility in Motion Planner (see page
6
). If you did not use the configuration utility or are not using a
Parker Motor, this command is set to zero and you will have to manually set this parameter. (Refer to
DMTR
for a list of auto-configured commands.)
The
DMTTCW
command specifies the time constant of the motor winding alone. This is the time for the
winding to reach 63% of it’s final temperature rise above the rest of the motor, given constant power. Note
that this is NOT the time constant usually specified in motor data sheets (see
DMTTCM
); the
DMTTCW
value is
typically much faster.
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