3-6 Malfunctions Not Indicated by a Fault
Motor accelerates or
decelerates incorrectly
Motor accelerates 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 651 “Accel Time” is too small. This parameter
specifies the accel rate as the total time to accelerate from 0 to
base speed.
• Parameter 663 “Fwd Brdg Lim” is set too high. This parameter
controls the armature current output during acceleration which
directly controls maximum torque available.
• 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 accelerates too slow for
application.
• Parameter 651 “Accel Time” is too large. This parameter
specifies the accel rate as the total time to accelerate from 0 to
base speed.
• 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 663 “Fwd Brdg Lim” is set too low. This parameter
controls the armature current output during acceleration 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. Its 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 sets 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.
Velocity Control Malfunctions
Malfunction Symptom Solution
Aotewell Ltd industry-mall.net
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