Malfunctions Not Indicated by a Fault 3-7
Motor accelerates or
decelerates incorrectly
(continued)
Motor accelerates too slow for
application.
(continued)
• Insufficient torque may be available due to improper field
set-up. The motor field parameters must be properly set up to
obtain maximum available torque. Verify that the field control is
properly calibrated.
• If the motor is accelerating under the JOG command verify that
the JOG ramp enable is set. The ramp enable for JOG is
activated through parameter 626 “Jog Ramp Enable”. If
parameter 626 is set to 1, the programmed ramp rates will be
used. If parameter 626 is set to 0, no ramp will be implemented
during JOG commands.
Motor decelerates too fast for
application.
• The ramp control is disabled in the active Logic Command. Bit
5 must be cleared for the ramp control to function.
• Parameter 652 “Decel Time” is too small. This parameter
specifies the decel rate as the total time to decelerate from
base speed to zero.
• Parameter 664 “Rev Brdg Lim” is set too high. This parameter
controls the armature current output during deceleration which
directly controls maximum torque available.
• If the motor is decelerating under the JOG command verify that
the JOG ramp enable is set. The ramp enable for JOG is
activated through parameter 626 “Jog Ramp Enable”. If
parameter 626 is set to 1, the programmed ramp rates will be
used. If parameter 626 is set to 0, no ramp will be implemented
during JOG commands.
Motor decelerates too slow for
application.
• Parameter 652 “Decel Time” is too large. This parameter
specifies the decel rate as the total time to decelerate from
base speed to zero.
• The ramp control is enabled in the active Logic Command. If no
ramp control is desired, bit 5 in the active Logic Command
must be set for the ramp control to be by-passed.
• Parameter 664 “Rev Brdg Lim” is set too low. This parameter
controls the armature current output during deceleration which
directly controls maximum torque available.
• The torque taper control may be limiting the torque command.
Torque taper is used to reduce the current limit as a function of
speed. It’s set-up is accomplished through parameter 665 “Strt
Taper Speed” which sets the velocity at which the maximum
torque will begin to be limited. Parameter 666 “End Taper
Speed” which set the velocity where the maximum torque will
be fully limited, and parameter 667 “Min Taper Cur” which sets
the maximum torque level at end taper speed.
• Insufficient torque may be available due to improper field
set-up. The motor field parameters must be properly set up to
obtain maximum available torque. Verify that the field control is
properly calibrated.
• If the motor is decelerating under the JOG command verify that
the JOG ramp enable is set. The ramp enable for JOG is
activated through parameter 626 “Jog Ramp Enable”. If
parameter 626 is set to 1, the programmed ramp rates will be
used. If parameter 626 is set to 0, no ramp will be implemented
during JOG commands
Velocity Control Malfunctions
Malfunction Symptom Solution
Aotewell Ltd industry-mall.net
To Next Page
Loading...
Need help?
General
