YASKAWA iQpump Micro CIMR-PW Series User Manual page 264

6.3 Fault Detection
LED Display LCD Display
The braking transistor or braking resistor are
wired incorrectly
Drive fails to operate properly due to noise
interference
Load inertia is set incorrectly
Motor hunting occurs
LED Display LCD Display
PF
Cause
There is phase loss in the drive input power
There is loose wiring in the drive input power
terminals
There is excessive fluctuation in the drive
input power voltage
There is poor balance between voltage phases Stabilize drive input power or disable phase loss detection.
The main circuit capacitors are worn out
LED Display LCD Display
POc
Cause
The pump has exceeded the number of cycles
set in P2-10 in the time set in P2-11 and P2-12
is set to 2 (fault).
LED Display LCD Display
rH
Cause
Deceleration time is too short and excessive
regenerative energy is flowing back into the
drive
The duty cycle is too high
Excessive braking inertia
The braking operation duty cycle is too high
The proper braking resistor has not been
installed
Note:
The magnitude of the braking load trips the braking resistor overheat alarm, NOT the surface temperature. Using the braking resistor more
frequently than its rating permits will trip the alarm even when the braking resistor surface is not very hot.
264
• Check braking transistor and braking resistor wiring for errors.
• Properly rewire the braking resistor device.
• Review the list of possible solutions provided for controlling noise.
• Review the section on handling noise interference and check the control circuit lines, main circuit lines,
and ground wiring.
• Check the load inertia settings when using KEB, overvoltage suppression, or Stall Prevention during
deceleration.
• Adjust the load inertia ratio in L3-25 to better match the load.
• Adjust the parameters that control hunting.
• Set the gain for Hunting Prevention (n1-02).
Input Phase Loss
Drive input power has an open phase or has a large imbalance of voltage between phases. Detected when
PF
L8-05 is set to 1 (enabled).
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
• Ensure the terminals are tightened properly.
• Apply the tightening torque as specified in this manual.
Torques on page 50
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
• Check the maintenance time for the capacitors (U4-05).
• Replace the capacitor if U4-05 is greater than 90%. For instructions on replacing the capacitor, contact
Yaskawa or a Yaskawa representative.
Check for problems with the drive input power. If drive input power appears normal but the alarm continues
to occur, replace the drive.
Pump Over Cycle
PoC
• Set the Pump Over Cycle fault characteristics in P2-10 and P2-11.
• Drive response to this condition is controlled by P2-12, Over Cycling Mode.
• Auto-restart of this fault is controlled by L5-52, Pump Over Cycle Fault Retry Selection.
• Set the Pump Over Cycle automatic setpoint compensation in P2-12, Over Cycling Mode, P2-13,
Setpoint Compensation, and P2-14, Maximum Setpoint Compensation.
Braking Resistor Overheat
Braking resistor protection was triggered.
rH
Fault detection is enabled when L8-01 = 1 (disabled as a default).
• Check the load, deceleration time, and speed.
• Reduce the load inertia.
• Increase the deceleration times (C1-01 to C1-04).
• Replace the dynamic braking option with a larger device that can handle the power that is discharged.
Check the duty cycle. Maximum of 3% duty cycle is available when L8-01 = 1.
Recalculate braking load and braking power. Reduce the braking load by adjusting braking resistor settings.
Check the braking operation duty cycle. Braking resistor protection for ERF-type braking resistors
(L8-01 = 1) allows a braking duty cycle of maximum 3%.
• Check the specifications and conditions for the braking resistor device.
• Select the optimal braking resistor.
Fault Name
Fault Name
Possible Solution
for details.
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual
Refer to Wire Gauges and Tightening