Diagnostics & Troubleshooting 6 - 23
If Motor Deceleration is Slow
The following causes are possible:
The deceleration time is long even when a braking resistor is connected.
The following causes are possible:
“Stall prevention during deceleration enabled” is set.
When a braking resistor is connected, set parameter L3-04 (Stall Prevention Selection During Deceleration) to 0 (disabled) or
3 (with braking resistor). When this parameter is set to 1 (enabled, factory default), the stall prevention function will interfere
with the braking resistor.
The deceleration time setting is too long.
Check the active deceleration time setting (parameters C1-02, C1-04, C1-06, or C1-08).
Motor torque is insufficient.
If the parameters are correct and there is no overvoltage fault, then the motor’s power may be insufficient. Consider increasing
the motor and Drive’s capacity.
The torque limit has been reached.
When a torque limit is reached (L7-01 to L7-04), the motor torque will be limited. This can cause the deceleration time to be
extended. Check to be sure that the value set for the torque limit is suitable.
If a torque limit has been set for the multi-function analog input terminals A2 or A3, parameters H3-09 or H3-05 (set value:
10, 11, 12, or 15), check to be sure that the analog input value is suitable.
If the Vertical-axis Load Drops (Droops) When a Mechanical Brake is Applied
The brake sequence is incorrect.
To ensure that the brake holds, set frequency detection 2 (H2-01 = 5) for the multi-function contact output terminals (M1 and
M2) so that the contacts will turn OFF when the output frequency is greater than L4-01 (3.0 to 5.0Hz). (The contacts will turn
ON below L4-01).
There is a hysteresis in the frequency detection 2 function (i.e., a frequency detection width, L4-02 = 2.0Hz). Change the
setting to approximately 0.5Hz if there is a load droop during stop. Do not use the multi-function contact output run signal
(H2-01 = 0) for the brake ON / OFF signal.
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