6-4
[ 2 ] The motor rotates, but the speed does not increase.
Possible Causes
What to Check and Suggested Measures
(1) The maximum frequency
currently specified was
too low.
Check the data of function codes F03 and A01 (Maximum
frequency).
Î
Readjust the data of F03 and A01.
(2) The data of frequency
limiter currently specified
was too low.
Check the data of function code F15 (Frequency limiter (high)).
Î
Readjust the data of (F15).
(3) The reference frequency
currently specified was
too low.
Check the signals for the frequency command from the analog input
terminals with Menu #4 "I/O Checking" on the keypad.
Î
Increase the frequency of the command.
Î
If an external potentiometer for frequency command, signal
converter, switches, or relay contacts are malfunctioning, replace
them.
Î
Connect the external circuit wires to terminals [13], [12], [11], and
[C1] correctly.
(4) A frequency command
(e.g., multi-frequency or
via communications)
with higher priority than
the one expected was
active and its reference
frequency was too low.
Check the data of the relevant function codes and what frequency
commands are being received, through Menu #1 "Data Setting,"
Menu #2 "Data Checking" and Menu #4 "I/O Checking," on the
keypad by referring to the block diagram of the frequency
command*.
*Refer to the FRENIC-Multi User's Manual, Chapter 4.
Î
Correct any incorrect data of function code (e.g. cancel higher
priority run commands, etc.).
(5) The acceleration time
was too long.
Check the data of function codes F07 and E10 (Acceleration time).
Î
Change the acceleration/deceleration time to match the load.
Measure the output current.
Î
Lighten the load (Adjust the dumper of the fan or the valve of the
pump). (In winter, the load tends to increase.)
(6) Overload
Check if mechanical brake is working.
Î
Release the mechanical brake.
(7) Mismatch with the
characteristics of the
motor
In case auto-torque boost or auto-energy saving operation is under
way, check whether P02, P03, P06, P07, and P08 (A16, A17, A20,
A21, and A22) agree with the parameters of the motor.
Î
Perform auto-tuning of the inverter for every motor to be used.
Make sure that F43 (Current limiter (mode selection)) is set to "2"
and check the setting of F44 (Current limiter (level)).
Î
If the current limiting operation is not needed, set F43 to "0"
(disabled).
Decrease the value of torque boost (F09), then run the motor again
and check if the speed increases.
Î
Adjust the value of the torque boost (F09).
(8) The current limiting
operation did not
increase the output
frequency.
Check the data of function codes F04, F05, H50 through H53 to
ensure that the V/f pattern is right.
Î
Match the V/f pattern values with the motor ratings.
Summary of Contents for FRENIC-Multi series
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