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Operational Overview
For example, the + Travel Limit will stop motion only if the motor is but allows -
motion to move off the limit switch. Conversely, the - Travel Limit will stop motion only if
the motor is moving - but motion to move off the limit switch.
If both input functions are active at the same time, no motion in either direction will be
possible until at least one of the inputs is released.
When or - Travel Limit input function is activated, a fault will be logged into the Fault
Log, and the drive will display an “L” on the LED diagnostics display on the front of the
drive. Once the axis is driven off the limit switch, the fault will be cleared and the “L” will
disappear.
If both Travel Limit input functions are activated simultaneously, the drive will respond as if
the Stop input function has been activated and will use the Stop Deceleration ramp.
EN Only
EN
The function of the Travel Limits will be effected by the installation of an Function
Module (FM) to the EN drive. Please refer to the particular FM’s reference manual for
complete description.
Travel Limit Application Notes
Torque Mode
If you are operating in Torque mode, the drive must be tuned to the load to prevent instability
when activating the Travel Limit input functions.
Host Controller Travel Limits
If the host controller decelerates the drive faster than the Travel Limit Deceleration ramp, the
drive allows the controller to maintain full control of the axis during the deceleration. This
results in no following error build up in the controller and easier recovery.
Vertical Loads in Velocity Mode
In applications with horizontal, counterbalanced or un-counterbalanced vertical loads, the
load will held in position when motion is stopped due to a + or - Travel Limit. The position
will be held until the controller commands motion in the opposite direction of the activated
Travel Limit.
Vertical Loads in Torque Mode
In applications with horizontal or counterbalanced vertical loads, the load will held in position
when motion is stopped due to a + or - Travel Limit. The position will be held until the
controller commands motion in the opposite direction of the activated Travel Limit.
When an axis is stopped by the upper Travel Limit with a vertical load, the controller must
maintain a torque command at a minimum level to hold the load or the load may drop.
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