Omron VS mini J7 User Manual page 136

Protective and Diagnostic Functions
Fault display Warning name and Meaning
ef
Forward- and reverse-rotation input (EF)
(flashing)
The forward and reverse commands are
input to the control circuit terminals
simultaneously for 0.5 s or more.
Note The Inverter stops according to the
method set in n04.
stp
Emergency stop (STP)
(flashing)
The Digital Operator stops operating. The
STOP/RESET Key on the Digital Operator
is pressed while the Inverter is operating
according to the forward or reverse
command through the control circuit
terminals.
Note The Inverter stops according to the
method set in n04.
The emergency stop alarm signal is input as
multi-function input. A multi-function input 1,
2, 3, or 4 set to 20 or 22 has been used.
Note The Inverter stops according to the
method set in n04.
fRn
Cooling fan fault (FAN)
(flashing)
The cooling fan has been locked.
ce
Communications time-over (CE)
Normal RS-422A/485 communications
were not established within 2 s. The Inverter
will detect this error if n68 (RS-422A/485
communications time-over detection selec-
tion) is set to 0, 1, or 2.
%p1
Operation error (OP_)
(flashing) (Parameter setting error)
%p2
(flashing)
%p3
(flashing)
%p4
(flashing)
%p5
(flashing)
122
Probable cause and remedy
• A sequence error has occurred.
→ Check and adjust the local or remote selection
sequence.
• The parameter setting was incorrect.
→ Turn off the forward or reverse command once,
check that the n06 parameter setting for
STOP/RESET Key function selection, and restart
the Inverter.
• An emergency stop alarm is input to a multi-function
input.
→ Remove the cause of the fault.
• The sequence is incorrect.
→ Check and change the external fault input sequence
including the input timing and NO or NC contact.
• The cooling fan wiring has a fault.
→ Turn off the Inverter, dismount the fan, and check
and repair the wiring.
• The cooling fan in not in good condition.
→ Check and remove the foreign material or dust on
the fan.
• The cooling fan is beyond repair.
→ Replace the fan.
• A short-circuit, ground fault, or disconnection has
occurred on the communications line.
→ Check and correct the line.
• The termination resistance setting is incorrect.
→ Set the termination resistance of only the Inverter
located at each end of the network to ON.
• Noise influence.
→ Do not wire the communications line along with
power lines in the same conduit.
→ Use the twisted-pair shielded wire for the
communications line, and ground it at the Master.
• Master's program error.
→ Check and correct the program so that
communications will be performed more than once
every 2-s period.
• Communications circuit damage.
→ If the same error is detected as a result of a
self-diagnostic test, change the Inverter.
• The values in n36 through n39 for multi-function inputs
1 through 4 have been duplicated. .
→ Check and correct the values.
• The V/f pattern settings do not satisfy the following
condition. n14 O n12 < n11 O n09
→ Check and correct the set value.
• The rated motor current set in n32 exceeds 150% of
the rated output current of the Inverter.
→ Check and correct the value.
• The frequency reference upper limit set in n30 and the
frequency reference lower limit set in n31 do not satisfy
the following condition. n30 P n31
→ Check and correct the set values.
• The jump frequencies set n49, n50 do not satisfy the
following condition. n49 P n50
→ Check and correct the set values.
Chapter 8-1