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Operation Selection After Cooling Fan Fault (SPEC: E or Later Only)
Use the constant setting to select the operation of the motor after a cooling fan fault occurs. This function can
be used for times when a motor should not be stopped quickly (with an emergency stop.)
Related Constants
* Applicable for F7-Series Inverters with software versions PRG:1031 or later.
The following table describes the operation of the motor and the display of the Digital Operator in accordance
with the settings of the L8-32 if a cooling fan fault occurred.
* If L8-32 is set to 0, the motor will continue running even if a cooling fan fault occurred. However, the Inverter rated output current and the
overload capacity will be reduced. The rated output current will be reduced to 80% if the normal rated output current is 100%, and the overload
capacity will be reduced to the values as follows.
When CT is selected: 100% per every 3 minutes, 150% per every 15 seconds
When VT is selected: 100% per every 30 seconds, 120% per every 10 seconds
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO
BUS
Regis-
ter
V/f
V/f
with
PG
Open
Loop
Vec-
tor
Flux
Vec-
tor
L
8
-32*
OH1 detec-
tion of
Inverter’ s
cooling fan
0: Disabled (FAN minor fault
detection)
1: Enabled (OH1 major fault
detection)
0 or 1
1
No
A
A
A
A
4E2H
Setting
Value
Fault
Digital Operator
Motor Operation
Multi-function Con-
tact Output
0
Cooling Fin Overheating
OH1 (lit)
Coast to a stop
Fault
Inverter’s Cooling Fan Fault FAN (blink)
Continue operation
*
Minor fault
1
Cooling Fin Overheating
OH (lit)
Coast to a stop
Fault
Inverter’s Cooling Fan Fault OH1 (lit)
Coast to a stop
Fault
IMPORTANT
If L8-32 is set to 0, be sure to set H2-01 to H2-03 multi-function contact outputs to 10 (minor fault) or to 3D
(Inverter’s cooling fan fault.) If a cooling fan fault occurs, stop the Inverter immediately and replace the cool-
ing fan. If the Inverter continues to run while a cooling fan fault occurs, the Inverter’s cooling ability will be
affected and the Inverter’s internal temperature will increase and shorten the Inverter’s life.
During a cooling fan fault, the cooling fan stops for about 3 seconds every minute (interval operation.)