6-21
Possible Causes
What to Check and Suggested Measures
(4) The rated capacity of the
motor was significantly
different from that of the
inverter.
Check whether the rated capacity of the motor is smaller than that
of the inverter by three or more orders of class or larger by two or
more orders of class.
Î
Check whether it is possible to replace the inverter with one with
an appropriate capacity.
Î
Manually specify the values for the motor parameters P06, P07,
and P08 or A20, A21, and A22.
Î
Disable both auto-tuning and auto-torque boost (set data of F37
or A13 to "1").
(5) The motor was a special
type such as a
high-speed motor.
Î
Disable both auto-tuning and auto-torque boost (set data of F37
or A13 to "1").
For details of tuning errors, refer to "Errors during Tuning" in Chapter 4, Section 4.1.3
"Preparation before running the motor for a test – Setting function code data."
[ 19 ]
er8
RS-485 communications error
erp
RS-485 communications error (Option card)
Problem
A communications error occurred during RS-485 communications.
Possible Causes
What to Check and Suggested Measures
(1) Conditions for
communications differ
between the inverter
and host equipment.
Compare the settings of the y codes (y01 to y10, y11 to y20) with
those of the host equipment.
Î
Correct any settings that differ.
(2) Even though no
response error detection
time (y08, y18) has been
set, communications is
not performed within the
specified cycle.
Check the host equipment.
Î
Change the settings of host equipment software, or make the no
response error detection time be ignored (y08, y18 = 0).
(3) Host equipment (e.g.,
PLCs and personal
computers) did not
operate due to incorrect
settings and/or defective
software/hardware.
Check the host equipment.
Î
Remove the cause of the equipment error.
(4) RS-485 converter did
not operate due to
incorrect connections
and settings, or
defective hardware.
Check the RS-485 converter (e.g., check for poor contact).
Î
Change the various RS-485 converter settings, reconnect the
wires, or replace hardware (such as recommended devices) as
appropriate.
(5) Broken communications
cable or poor contact.
Check continuity of the cable, contacts and connections.
Î
Replace the cable.
Summary of Contents for FRENIC-Multi series
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