B&C Technologies SA Series Industrial - Manual (Page 71)

TROUBLE SHOOTING
7-11
Possible Causes What to Check and Suggested Measures
2. The power inverter was
switched back on too soon
(with F14 = 1)
Check that you switch the inverter on after the power for the
control circuit had reached an appropriate level. This can be
checked using the display on the LED monitor.
→ Wait for a longer time than the last time before switching the
inverter on.
3. The power supply voltage
did not reach the range of
the inverter’s
specifications. Measure the input voltage.
→ Increase the voltage to within that of the specifications.
4. Peripheral equipment for
the power circuit
malfunctioned, or the
connection was incorrect.
Measure the input voltage to find where the peripheral equipment
malfunctioned or which connection is incorrect.
→ Replace any faulty peripheral equipment, or correct any
incorrect connections.
5. Other loads were
connected to the same
power system and required
a large current to start
running to the extent that it
caused a temporary
voltage drop.
Measure the input voltage and check the voltage variation.
→ Reconsider the power system configuration.
6. Inrush current caused the
power voltage drop
because power transformer
capacity was insufficient.
Check if the alarm occurs when you switch on a molded case
circuit breaker, an earth leakage circuit breaker (with the exception
of those exclusively designed for protection from ground faults) or
a magnetic contactor.
→ Reconsider the capacity of the power transformer.
4. “Lin” Input phase loss protection
Problem Input phase loss occurred, or interphase voltage unbalance rate was large.
Possible Causes What to Check and Suggested Measures
1. Main circuit power input
wires broken.
Measure the input voltage.
→ Repair or replace the wires.
2. The terminal screws for
the main circuit power
input were not tight
enough. Check if the terminal screws have become loose.
→ Tighten the terminal screws to the recommended torque.
3. Interphase unbalance rate
of three – phase voltage
was too large.
Measure the input voltage.
→ Connect an AC reactor (ACR) or a DC reactor (DCR) to lower
the rate.
→ Raise the inverter capacity.
4. Overload cyclically
occurred.
Measure ripple wave of DC link circuit voltage.
→ If the ripple is large, raise the inverter capacity.
5. Single-phase voltage was
inputted to the inverter
instead of three-phase
voltage input. Check the inverter type.
→ Change the inverter to one for single-phase voltage input.