Alarm Detection - YASKAWA CIMR-F7A Instruction Manual

Alarm Detection

Alarms are detected as a type of Inverter protection function that do not operate the fault contact output. The
system will automatically returned to its original status once the cause of the alarm has been removed.
The Digital Operator display blinks and an alarm is sent from the multi-function outputs (H2-01 to H2-03) if
selected.
When an alarm occurs, take appropriate countermeasures according to the table below.
Display
Forward/Reverse Run Commands
Input Together
Both the forward and Reverse Run
(blink-
Commands have been ON for more
ing)
than 0.5 s.
Main Circuit Undervoltage
The following conditions occurred
when there was no Run signal.
• The main circuit DC voltage was
below the Undervoltage Detection
(blink-
Level Setting (L2-05).
ing)
• The surge current limiting mag-
netic contactor opened.
• The control power supply voltage
when below the CUV level.
Main Circuit Overvoltage
The main circuit DC voltage exceeded
the overvoltage detection level.
(blink-
200 V Class: Approx. 410 V
ing)
400 V Class: Approx. 820 V
Cooling Fin Overheating
The temperature of the Inverter's cool-
(blink-
ing fins exceeded the setting in L8-02.
ing)
Inverter's Cooling Fan Fault
An Inverter's cooling fan fault was
detected.
(blink-
This fault is detected when L8-32 is
ing)
set to 0.
Inverter Overheating Pre-alarm
An OH2 alarm signal (Inverter over-
heating alarm signal) was input from a
(blink-
multi-function input terminal (S3 to
ing)
S8).
-12
7
Table 7.3 Alarm Displays and Processing
Meaning
See causes for UV1, UV2, and UV3
faults in the previous table.
The power supply voltage is too high.
The ambient temperature is too high.
There is a heat source nearby.
The Inverter cooling fan has stopped.
• A short-circuit between +V, −V, and
AC terminals occurred.
• Overload in the control circuit ter-
minal.
The Inverter's cooling fan has
stopped.
Probable causes
Check the sequence of the forward
and Reverse Run Commands.
Since the rotational direction is
-
unknown, the motor will be deceler-
ated to a stop when this minor fault
occurs.
See corrective actions for UV1, UV2,
and UV3 faults in the previous table.
Decrease the voltage so it's within
specifications.
Install a cooling unit.
Remove the heat source
Replace the cooling fan. (Contact
your Yaskawa representative.)
• Make sure that incorrect wiring has
• Check the resistance and wiring for
Replace the cooling fan. (Contact our
sales representative.)
Clear the multi-function input termi-
-
nal's overheating alarm input.
Corrective Actions
not been done.
the frequency setting potentiome-
ter, etc. (Check that the current for
terminals +V and –V is 20 mA or
less.)