Magnetek Elevator HPV1000 AC Technical Manual page 62

7 Troubleshooting
Fault Code/Name
Voltage in the DC bus has exceeded the
overvoltage detection level.
ov For 400V Class: approx. 820 V
Note: For drive models with
Overvolt Flt
Bus OverVolt Alm
PASS MEMOBUS/Modbus Communication
(alarm) Test Mode Complete
PF Drive input power has an open phase or
has a large imbalance of voltage between
LS Phase Flt phases. Detected when Inp Ph Loss Prot
Input Phase Alm (C1) is enabled.
60
Description
internal DBR
transistor, the turn-on
voltage is 788V for
400V class drives.
Causes and Solutions
Deceleration ramp is too short and regenerative energy is flowing from the
motor into the drive.
• Lower the deceleration in the A2 sub-menu.
Fast acceleration ramp causes the motor to overshoot the speed reference.
• Check if sudden drive acceleration triggers an overvoltage alarm.
• Lower the acceleration ramp in the A2 sub-menu.
• Lower the jerk setting in the A2 sub-menu.
Surge voltage entering from the drive input power.
• Install a DC link choke.
Note: Voltage surge can result from a thyristor converter and
phase advancing capacitor using the same input power
supply.
Ground fault in the output circuit causes the DC bus capacitor to overcharge.
• Check the motor wiring for ground faults.
• Correct grounding shorts and turn the power back on.
Drive input power voltage is too high.
• Check the voltage.
• Lower drive input power voltage within the limits listed in the
specifications.
The external braking transistor or regen drive does not seem to be wired
correctly.
• Check the braking transistor wiring for errors.
• Check that the external CDBR or regen drive is operating.
Dynamic Braking Resistors
Verify that the resistors are connected correctly to the drive.
• Verify that the correct resistance is read on a meter.
• Verify that the resistance is low enough to dissipate the regenerative energy
quickly enough for the application.
Encoder cable is disconnected.
• Reconnect the cable.
Encoder cable wiring is wrong.
• Correct the wiring.
Noise interference along the encoder wiring.
• Separate the wiring from the source of the noise (often the output lines
from the drive).
Drive fails to operate properly due to noise interference.
• 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.
Drive hardware is damaged.
• Verify that the measured DC bus voltage (with meter) and the DC Bus
Voltage (D2) are reading the same voltage.
MEMOBUS/Modbus test has finished normally.
• This verifies that the test was successful.
There is phase loss in the drive input power.
• Check for wiring errors in the main circuit drive input power.
• Correct the wiring.
There is loose wiring in the drive input power terminals.
• Ensure the terminals are tightened properly.
• Apply the tightening torque as specified in this manual.
There is excessive fluctuation in the drive input power voltage.
• Check the voltage from the drive input power.
• Review the possible solutions for stabilizing the drive input power.
There is poor balance between voltage phases.
• Stabilize drive input power or disable phase loss detection.
Parameter Setting
• If the drive is being fed single phase power, disable Inp Ph Loss Prot (C1).
The main circuit capacitors are worn.
• Check the maintenance time for the capacitors (D2).
• Replace the capacitor if Cap Life Mon (D2) is greater than 90%. For
instructions on replacing the capacitor, contact Magnetek.
• Check for problems with the drive input power. If drive input power
appears normal but the alarm continues to occur, replace either the control
board or the entire drive. For instructions on replacing the control board,
contact Magnetek.
MAGNETEK HPV1000 AC Elevator Drive Technical Manual