Tek Drive TDS-F8, Instruction Manual

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5.
Warning/ Fault Condition, the possible Causes and Remedies
F8 has built-in the warning and fault protective functions. When the F8 detects a fault, the fault message is
displayed on the operator and activates a fault signal output, after which the motor coasts to a stop.
Unlike faults, warning do not activate fault contact outputs. When the F8 detects a warning, the warning message
is flashed on the operator only. After the cause of the warning is corrected, the F8 returns to its former operation
status automatically.
There are some tables later on in this section must be seen as a basic aid to find the cause of a F8 failure and to
how to solve any problems that arise.
5-1 Fault Condition (Message Lits), the possible Causes and Remedial Actions
Fault
Condition
Name and Possible Causes Remedies
DC Bus
Undervoltage
Too low DC Link voltage exceeded the
Undervoltage Detection level during running.
- Too low or no supply voltage or phase loss
- Mains voltage dip due to starting other major
power consuming machines on the same line.
- Worse Mains wiring.
- Make sure all mains wires are properly connected
and that the terminal screws are tightened.
- Check that the mains supply voltage is within the
limits of F8.
- Try to use other mains supply lines if dip is caused
by other machinery.
- Use the momentary power loss function.
Overcurrent
Motor current exceeds the peak F8 Current
(Approximately 200% Rated Current):
- Too short acceleration time.
- Too high motor load.
- Excessive load change.
- Soft short-circuit between phases or phase to earth
- Poor or loose motor cable connections.
- Check on ACC time settings and make it longer if
necessary.
- Check on motor load.
- Check motor coil resistance & Insulation.
- Check on bad motor cable connections.
- Check on bad earth cable connection.
- Check on water or moisture in the motor housing
and cable connections.
DC Bus
Overvoltage
Too high DC Link voltage exceeded the
Overvoltage Detection level during running.
- Power supply voltage is too high.
- Too short deceleration time with respect to motor/
machine inertia.
- Too small brake resistor, or malfunctioning Brake
Transistor.
- Check and decease the power supply voltage
within F8 specification.
- Increase deceleration time.
- Check on deceleration time settings and make
them longer (if necessary).
- Add a suitable size braking resister (if necessary).
- Check on size of the brake resister and the related
parameter Setting (if used).
Overheat
The Heatsink Temperature is too High.
- Too high ambient temperature.
- Heat source nearby or Insufficient cooling.
- Blocked or stuffed cooling fan.
- Check on cooling of the F8 cabinet.
- Install a cooling unit or remove heat source.
- Check on functionality of the built-in cooling fans.
The fans must run automatically if the F8is
powered on.
- Clean fan or replace a new fan (if necessary).
Motor
Overload
F8 output exceeded the motor overload level.
- Load too heavy
- Acceleration, deceleration, cycles are too short.
- V/F curve setting is incorrect; the voltage is too
high or too low.
- 07-01 setting value is wrong (too small)
- Self-cooled motor at low speed, high load
- Check on mechanical overload on motor or the
machinery (bearing, gearbox, chains, belts, etc.)
- Reduce the load.
- Check on acceleration, deceleration, cycle Time.
- Check on V/F curve setting.
- Check on 7-01 motor rating current setting
- Check on 6-09 and motor cooling system.
VFD
Overload
F8 output exceeded the F8 Overload level.
- Load too heavy
- Acceleration, deceleration, cycles are too short.
- V/F curve setting is incorrect; the voltage is too
high or too low.
- The F8 Size too small.
- Check on Mechanical Overload on Motor or the
Machinery (Bearing, Gearbox, Chains, Belts, etc.)
- Reduce the load.
- Check on Acceleration, Deceleration, Cycle Time.
- Check on V/F Curve setting.
- Replace F8 by bigger rating