YASKAWA Varispeed G7 - Page 395

Protective and Diagnostic Functions
7-5
FAN
Cooling
Fan Fault
Inverter’s Cooling Fan Fault
An Inverter’s cooling fan fault was
detected, and the Inverter-overload
protection was activated based on the
internal electric thermal value.
This fault is detected when L8-32 is
set to 0.
The Inverter continued running with
an overload after the cooling fan
stopped.
Replace the cooling fan. (Contact
our sales representative.)
OH3
Motor
Overheat 1
Motor Overheating Alarm
The Inverter will stop or will continue
to operate according to the setting of
L1-03.
The motor has overheated.
Check the size of the load and the
length of the acceleration, deceler-
ation, and cycle times.
Check the V/f characteristics.
Check the Motor Rated Current
(E2-01).
OH4
Motor
Overheat 2
Motor Overheating Fault
The Inverter will stop according to the
setting of L1-04.
The motor has overheated.
Check the size of the load and the
length of the acceleration, deceler-
ation, and cycle times.
Check the V/f characteristics.
Check the Motor Rated Current
(E2-01).
RH
DynBrk
Resistor
Installed Braking Resistor Over-
heating
Braking resistor protection function
set in L8-01 has operated.
The deceleration time is too short and
the regenerative energy from the
motor is too large.
• Reduce the load, increase the
deceleration time, or reduce the
motor speed.
• Change to a Braking Resistor
Unit.
RR
DynBrk
Transistr
Internal Braking Transistor Fault
The braking transistor is not operating
properly.
• The braking transistor is damaged.
• The Inverter’s control circuits are
faulty.
• Try turning the power supply
off and on.
• Replace the Inverter if the fault
continues to occur.
Table 7.1 Fault Displays and Processing (Continued)
Display Meaning Probable Causes Corrective Actions