Deceleration Takes Longer Than Expected When Dynamic Braking Is Enabled; The Load Falls When A Brake Is Applied; Energized; Residual Current Monitoring/Detection (Rcm/Rcd) Trips During Run - Omron Q2A Series Technical Manual

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Deceleration Takes Longer Than Expected When Dynamic Braking Is Enabled

Causes
The stall prevention during deceleration setting is incorrect.
The deceleration time setting is too long.
The motor torque is not sufficient.
The drive and motor system reached the torque limit.
The load is more than the internal torque limit as specified by the drive rated
current.
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The Load Falls When a Brake Is Applied

Causes
The open/close timing of the brake is incorrect.
The DC injection braking is not sufficient.
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There Is Audible Noise from the Drive or Motor Cables When the Drive Is

Energized

Causes
The relay switching in the drive is making too much noise.
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Residual Current Monitoring/Detection (RCM/RCD) Trips During Run

Causes
There is too much leakage current from the drive.
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
7.10 Troubleshooting Without Fault Display
Possible Solutions
• Examine the setting for L3-04 [StallP@Decel Enable].
• When the drive has a dynamic braking option installed, set L3-04 = 0 [Disabled].
• If the drive detects ov [Overvoltage], set L3-04 = 1 [Enabled] and L3-50 = 2 [Gen Purpose
w/ DB Resistor].
Set C1-02, C1-04, C1-06, or C1-08 [Decel Time 1, Decel Time 2, Decel Time 3, or Decel Time 4]
to applicable values.
Use a larger motor.
Note:
If these items are correct, the demand on the motor is more than the motor capacity:
• Parameter settings are correct.
• The drive does not detect ov [Overvoltage].
• Examine the values set in L7-01 to L7-04 [FW Torque Limit to RV Reg. TrqLimit] and increase
them if necessary.
Note:
If the torque limit is enabled, deceleration time can increase because the drive cannot output
more torque than the limit.
• If H3-02, H3-10, H3-06 = 9, B, C, D [AI1 Function Selection, AI2 Function Selection, AI3
Function Selection = Torque Limit] has been set, examine the settings for the MFAIs.
• Examine the values set in H3-02, H3-10, and H3-06.
• Use U1-13, U1-14, and U1-15 [Terminal AI1 Input Lv, Terminal AI2 Input Lv, and
Terminal AI3 Input Lv] to make sure that the analog input values set to terminals AI1, AI2,
and AI3 are applicable.
Replace the drive with a larger capacity model.
Possible Solutions
Refer to "Notes on Controlling the Brake when Using the Hoist Application Preset" in the
Technical Manual and take appropriate measures.
Increase the value set in b2-02 [DCI Braking Current].
Possible Solutions
• Use C6-02 [Carrier Frequency Selection] to decrease the carrier frequency.
• Connect a noise filter to the input side of the drive power supply.
• Connect a noise filter to the output side of the drive.
• Isolate the control circuit wiring from the main circuit wiring.
• Use a metal cable gland to wire the drive.
• Shield the periphery of the drive with metal.
• Make sure that the drive and motor are grounded correctly.
• Make sure that ground faults have not occurred in the wiring or motor.
Possible Solutions
• Increase the RCM/RCD sensitivity or use RCM/RCD with a higher threshold.
• Use C6-02 [Carrier Frequency Selection] to decrease the carrier frequency.
• Decrease the length of the cable used between the drive and the motor.
• Install a noise filter or AC reactor on the output side of the drive. Set C6-02 = 1 [2.0 kHz]
when connecting an AC reactor.
• Disable the internal EMC filter.
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