Troubleshooting
7
7.4 Faults
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 267
Code Name Causes Possible Solutions
oL7 High Slip Braking Overload
The load inertia is too large.
An external force on the load side rotated the motor.
Something is preventing deceleration on the load
side.
• Decrease deceleration times in C1-02 [Decel Time 1], C1-04
[Decel Time 2], C1-06 [Decel Time 3], and C1-08 [Decel Time
4] for applications that do not use High Slip Braking.
• Use a braking resistor to decrease the deceleration time.
The value set in n3-04 [HSB Overload Time] is too
small.
• Increase the value set in n3-04.
• Connect a thermal overload relay to the motor, and set n3-04 =
1200 s (maximum value).
Note:
• The drive detects this fault if the output frequency is constant for longer than n3-04.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
oPr Keypad Connection Fault
The keypad is not securely connected to the
connector on the drive.
Examine the connection between the keypad and the drive.
The connection cable between the drive and the
keypad is disconnected.
• Remove the keypad and connect it again.
• If the cable is damaged, replace it.
Note:
• The drive detects this fault if these conditions are correct:
–o2-06 = 1 [Keypad Disconnect Detection = Enabled].
–b1-02 = 0 [Run Comm. Sel 1 = Keypad], or the drive is operating in LOCAL Mode with the keypad.
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
oS Overspeed
There is overshoot. • Decrease C5-01 [ASR PGain 1] and increase C5-02 [ASR
ITime 1].
• Adjust the pulse train gain with Pulse Train Input Setting
Parameters H6-02 to H6-05 .
There is an incorrect number of PG pulses set in the
drive.
Set H6-02 [PI Frequency Scale] to the pulse train frequency
during 100% reference (maximum motor rotation speed).
The oS detection level is set incorrectly. Adjust F1-08 [Overspeed Level] and F1-09 [Overspeed Delay
Time].
Note:
• The drive detects this fault if the motor speed is more than the value set in F1-08 for longer than F1-09.
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the Stopping Method set in F1-03 [Overspeed Detection Selection].
Code Name Causes Possible Solutions
ov Overvoltage
Deceleration time is too short and regenerative
energy is flowing from the motor into the drive.
• Set L3-04 = 1 [StallP@Decel Enable = Enabled] and L3-50 =
0 [StallP@Decel Mode = General Purpose].
• Increase the values set in C1-02 [Decel Time 1], C1-04 [Decel
Time 2], C1-06 [Decel Time 3], or C1-08 [Decel Time 4].
• Connect a dynamic braking option to the drive.
• Perform Deceleration Rate Auto-Tuning.
The acceleration time is too short. • Make sure that sudden drive acceleration does not cause the
fault.
• Increase the values set in C1-01 [Accel Time 1], C1-03 [Accel
Time 2], C1-05 [Accel Time 3], or C1-07 [Accel Time 4].
• Increase the value set in C2-02 [Jerk@End of Accel].
• Set L3-11 = 1 [Overvolt Supression Select = Enabled].
The braking load is too large. Connect a dynamic braking option to the drive.
There are surge voltages in the input power supply. Connect a DC reactor to the drive.
Note:
If you turn the phase advancing capacitors ON and OFF and
use thyristor converters in the same power supply system,
there can be surge voltages that irregularly increase the input
voltage.
The drive output cable or motor is shorted to ground
(the current short to ground is charging the main
circuit capacitor of the drive through the power
supply).
1. Examine the motor main circuit cable, terminals, and motor
terminal box, and then remove ground faults.
2. Re-energize the drive.
If the drive detects ov in these conditions, the speed
search-related parameters are incorrect:
• During speed search
• During momentary power loss recovery
• When the drive starts again automatically
• Examine the settings for all speed search related parameters.
• Set b3-19 ≠ 0 [Speed Retry Times ≠ 0 times].
• Adjust b3-03 [SpSrch Deceleration Time] settings.
• Do Stationary Auto-Tuning for Line-to-Line Resistance and
then set b3-24 = 1 [SpSrch Method Selection = Speed
Estimation].
The power supply voltage is too high. Decrease the power supply voltage to match the drive rated
voltage.
The braking resistor or braking resistor unit wiring
is incorrect.
Correct wiring errors in the connection to the braking resistor or
braking resistor unit.
The encoder cable is disconnected or wired
incorrectly.
Examine for wiring errors or disconnected wires in the encoder
cable, and repair problems.
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