Troubleshooting
7
7.4 Faults
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 255
Code Name Causes Possible Solutions
Electrical interference caused a communication data
error.
• Examine the control circuit lines, main circuit lines, and
ground wiring, and decrease the effects of electrical
interference.
• Make sure that a magnetic contactor is not the source of the
electrical interference, then use a Surge Protective Device if
necessary.
• Use only the recommended cables or other shielded line.
Ground the shield on the controller side or the drive input
power side.
• Isolate the communication wiring from drive power lines, and
install a noise filter to the input side of the power supply for
communication.
• Decrease the effects of electrical interference from the
controller.
Note:
• The drive detects this error if it does not correctly receive control data for the CE detection time set to H5-09 [Mbus CE Detect Time].
• Do a Fault Reset to clear the fault.
• If the drive detects this error, the drive will operate the motor as specified by the stopping method set in H5-04 [Mbus Error Stop].
Code Name Causes Possible Solutions
CF Control Fault
Motor parameters are set incorrectly. Correctly set the motor parameters and do Auto-Tuning again.
Drive takes long to ramp to stop when Control
Method = 4 [Adv OLVector] because of these
settings:
• The torque limit is too low.
• L3-11 = 1 [Overvolt Supression Select =
Enabled]
• d5-01 = 1 [Torque Ctrl Selection = Torque
Control]
When you have changes in Rotational Auto-Tuning and the
installation environment, make sure that you do Line-to-Line
Resistance Tuning and then set L8-20 = 1 [CF / STPo Selection =
Disabled].
Note:
Do test runs and examine the drive to start and stop correctly
when L8-20 = 1.
The torque limit is too low. Adjust L7-01 [FW Torque Limit], L7-02 [RV Torque Limit], L7-03
[FW Reg. TrqLimit], and L7-04 [RV Reg. TrqLimit].
The load inertia is too big. • Adjust C1-02 [Decel Time 1], C1-04 [Decel Time 2], C1-06
[Decel Time 3], and C1-08 [Decel Time 4.
• Set the frequency reference to the minimum output frequency,
and stop the Run command when the drive stops deceleration.
The drive is trying to ramp to stop a machine that
cannot do ramp to stop or on a machine for which
deceleration is not necessary.
Correctly set b1-03 [Stopping Method Selection].
The motor and drive are connected incorrectly. Correct wiring errors.
Line-to-line Resistance Tuning is not done. Do Stationary Auto-Tuning for Line-to-Line Resistance.
The drive received a Run command while the motor
was coasting.
• Examine the sequence and input the Run command after the
motor fully stops.
• Set b3-01 = 1 [SpSrch@Start Selection = Enabled].
Note:
• The drive detects this error if the torque reference is more than the torque limit for 3 seconds or longer while the drive ramps to stop.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
CoF Current Offset Fault
The drive starts operation while the induced voltage
stays in the motor (during coasting to a stop or after
fast deceleration).
• Make a sequence that does not restart operation when induced
voltage stays in the motor.
• Set b3-01 = 1 [SpSrch@Start Selection = Enabled].
• Use Speed Search from Fmax or Fref [H1-xx = 67, 68] to do a
speed search through one of the external terminals.
Note:
When controlling the PM motor, External Speed Search
commands 1 and 2 operate the same.
A drive hardware problem occurred. Replace the drive.
Note:
• The drive detects this error if the current offset value is more than the permitted setting range while the drive automatically adjusts the current offset.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
CP1 Comparator 1 Limit Fault
The monitor value set in H2-20 [Compare1 Mon.
Selection] was within the range of H2-21
[Compare1 Low Limit] and H2-22 [Compare1 Up
Limit].
Examine the monitor value and remove the cause of the fault.
Note:
• The drive detects this error when the terminal is assigned to H2-01, H2-02, and H2-03 = 3C [2NO-2CM Func Selection, 3NO-3CM Func Selection, 4NO-4CM Funct
Selection = Comparator1].
• Do a Fault Reset to clear the fault.
• Set the stopping method for this fault in H2-33 [Compare1 Protection Selection].
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