6-18
6
2. Setup of gain pre-adjustment protection
When in Trouble
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Before starting gain adjustment, set the following parameters based on the conditions of
use, to assure safe operation.
1) Setup of over-travel inhibit input
By inputting the limit sensor signal to the driver, the bumping against mechanical end
can be prevented. Refer to interface specification, positive/negative direction over-
travel inhibit input (POT/NOT). Set the following parameters which are related to over-
travel inhibit input.
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2) Setup of torque limit
By limiting motor maximum torque, damage caused by failure or disturbance such as
bite of the machine and collision will be minimized. To apply standardized limit through
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If the torque limit setup is lower than the value required during the actual application,
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overshoot occurs, and excess positional deviation protection when response to the
command delays.
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-
nal, torque limit condition can be detected externally.
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3) Setup of over-speed protection
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Default setting is the applicable motor maximum speed [r/min] × 1.2.
If your application operates below the motor maximum speed, set Pr5.13 Setup of
over-speed level by using the formula below.
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to 1.5)
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Factor in ( ) is margin to prevent frequent activation of over-speed protection.
When running the motor at a low speed during initial adjustment stage, setup the over-
speed protection by multiplying the adjusting speed by a certain margin to protect the mo-
tor against possible oscillation.
P.4-46 (Pr5.13)
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