Fuji Electric FRN355VG1S-4J [1000/1046] P9 pg wire break

Fuji Electric FRN160VG1S-4J [1000/1046] P9 pg wire break
13-24
Possible Causes What to Check and Suggested Measures
(6) Malfunction caused by
noise.
Check if the DC link bus voltage was below the protective level when the
overvoltag
e alarm occurred.
Î Implement noise control measures. For details, refer to the FRENIC-VG
User's Manual, "Appendix A."
Î Enable the auto-reset (H04).
Î Connect a surge absorber to magnetic contactor's coils or other
solenoids (if any) causing noise.
(7) The inverter output lines
were short-circuited.
Disconnect the wiring from the inverter output terminals ([U], [V] and [W])
and measure the interphase resistance of the motor wiring. Check if the
resistance is too low.
Î Remove the short-circuited part (including replacement of the wires,
relay terminals and motor).
(8) Wrong connection of the
braking resistor.
Check the connection.
Î Correct the connection.
(9) Large, rapid decrease of the
load.
Check whether the inverter runs at the time of rapid decrease of the load.
Î Consider the use of a braking resistor or PWM converter (RHC-C).
[ 33 ]
p9
PG wire break
Problem The pulse generator (PG) wire has been broken somewhere in the circuit.
Possible Causes What to Check and Suggested Measures
(1) Wire break between the
pulse generator (PG) and the
option.
Check whether the PG is correctly connected to the option or any wire is
broken.
Î Check whether the PG is connected correctly. Or, tighten up the related
terminal screws.
Î Check whether any joint or connecting part bites the wire sheath.
Î Replace the wire.
(2) Connection failure of
speed/magnetic pole
position sensor.
(3) Motor rotation direction and
sensor output not matched.
Check the output wiring of the speed/magnetic pole position sensor for poor
contact or the phase sequence of the AB phases and UVW phases.
Î Connect the speed/magnetic pole position sensor to the feedback input
card correctly.
Check the motor wiring for poor contact or the phase sequence.
Î Connect the inverter with the motor correctly.
(4) Connection failure of option
card(s)
Check whether the connector of the option card engages with that of the
inverter unit.
Î Mount the option card on the inverter unit correctly.
(5) PG related circuit affected
by strong electrical noise.
Check if appropriate noise control measures have been implemented (e.g.,
correct grounding and routing of signal wires, communication cables, and
main circuit wires).
Î Implement noise control measures.
Î Separate the signal wires from the main power wires as far as possible.
(6) Motor drive control
wrongly selected.
Check the motor drive control currently selected.
Î If no PG is mounted, select the vector control without speed sensor.
(7) Mismatch between the PG
power voltage (rated) and
the output voltage setting of
terminal [PGP].
Check the PG power voltage (rated) and the output voltage setting of
terminal [PGP] (switchable with SW6).
Î Set SW6 properly.
For details, refer to Chapter 3, Section 3.3.3.9 "Setting up the slide
switches."
(8) PG wires small in size. Check whether the PG wires satisfy the recommended wire size.
Î Replace the wires with the recommended one.

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