10-5
10.3 If Neither an Alarm Code Nor "Light Alarm" Indication (
) Appears on the LED Monitor
This section describes the troubleshooting procedure based on function codes dedicated to motor 1 which are marked
with an asterisk (*). For motors 2, replace those asterisked function codes with respective motor dedicated ones (refer to
Chapter 4 of the user manual, Section 5.2.6, and Table 5.5).
For the function codes dedicated to motors 2, see Chapter 4 "FUNCTION CODES."
10.3.1 Abnormal motor operation
[ 1 ] The motor does not rotate.
Possible Causes
What to Check and Suggested Measures
(1) No power supplied to the
inverter.
Check the input voltage and interphase voltage unbalance.
Turn ON a molded case circuit breaker (MCCB), a residual-current-
operated protective device (RCD)/earth leakage circuit breaker (ELCB) (with
overcurrent protection) or a magnetic contactor (MC).
Check for voltage drop, phase loss, poor connections, or poor contacts, and
fix them if necessary.
If only the auxiliary control power input is supplied, also supply the main
power to the inverter.
(2) No run forward/reverse
command was inputted, or
both the commands were
inputted simultaneously
(external signal operation).
Check the input status of the forward/reverse command with Menu #4 "I/O
Checking" using the keypad.
Input a run command.
Set either the forward or reverse run command off if both commands are
being entered.
Correct the run command source. (Set F02 data to "1.")
Correct the assignment of commands
FWD
and
REV
with function codes
E98 and E99.
Connect the external circuit wires to control circuit terminals [FWD] and
[REV] correctly.
Make sure that the sink/source slide switch (SW1) on the control printed
circuit board (control PCB) is properly configured.
(3) No Enable input
Check the input status of terminal [EN] with Menu #4 "I/O Checking" using the
keypad.
Correct the external circuit wiring to control circuit terminal [EN].
(4) The inverter could not
accept any run commands
from the keypad since it was
in Programming mode.
Check which operation mode the inverter is in, using the keypad.
Shift the operation mode to Running mode and enter a run command.
(5) A run command with higher
priority than the one
attempted was active, and
the run command was
stopped.
Referring to the block diagram of the frequency command block (given in EQ7
User's Manual, Chapter 6), check the higher priority run command with Menu #2
"Data Checking" and Menu #4 "I/O Checking" using the keypad.
Correct any incorrect function code data settings (in H30, y98, etc.) or cancel
the higher priority run command.
(6) No analog frequency
command input.
Check whether the analog frequency command (reference frequency) is
correctly inputted, using Menu #4 "I/O Checking" on the keypad.
Connect the external circuit wires to terminals [13], [12], [11], [C1], and [V2]
correctly.
When terminal [C1] is used, check the slider position of terminal [C1] property
switch (SW5) and the setting of the thermistor mode selection (H26).
(7) The reference frequency
was below the starting or
stop frequency.
Check that a reference frequency has been entered correctly, using Menu #4 "I/O
Checking" on the keypad.
Set the reference frequency at the same or higher than that of the starting and
stop frequencies (F23* and F25).
Reconsider the starting and stop frequencies (F23* and F25), and if
necessary, change them to the lower values.
Inspect the external frequency command potentiometers, signal converters,
switches, and relay contacts. Replace any ones that are faulty.
Connect the external circuit wires to terminals [13], [12], [11], [C1], and [V2]
correctly.
