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Advanced Operation
6-7
Other Functions
The following description provides information on the other functions and parameter set-
tings of the Inverter.
6-7-1 Motor Protection Characteristics (n33 and n34)
• This parameter setting is for motor overload detection (OL1).
n33
Motor Protection Characteristic Selection
Setting
0 to 2
range
Set Values
Value
0
Protection characteristics for general-purpose induction motors
1
Protection characteristics for Inverter-dedicated motors
2
No protection
• This parameter is used to set the electric thermal characteristics of the motor to be connected.
• Set the parameter according to the motor.
• If a single Inverter is connected to more than one motor, set the parameter to 2 for no protection. The
parameter is also disabled by setting n32 for rated motor current to 0.0. To protect each motor from
overload, be sure to take an appropriate measure such as the installation of a thermal relay.
n34
Motor Protection Time
Setting
1 to 60 (min)
range
Set Values
• This parameter is used to set the electronic thermal protection constant of motor overload detection
OL1.
• The default setting does not need any changes in normal operation.
• To set the parameter according to the characteristics of the motor, confirm the thermal time constant
with the motor manufacturer and set the parameter with some margin. In other words, set the value a
little shorter than the thermal time constant.
• To detect motor overloading more quickly, reduce the set value, provided that it does not cause any
application problems.
6-7-2 Cooling Fan Operation Function (n35)
• This parameter is used to operate the cooling fan of the Inverter while the Inverter is turned on or only
while the Inverter is in operation.
n35
Cooling Fan Operation Selection
Setting
0, 1
range
6-14
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Unit of
1
setting
Description
Unit of
1 min
setting
Unit of
1
setting
Chapter 6
Changes during
No
operation
Default setting
0
Changes during
No
operation
Default setting
8
Changes during
No
operation
Default setting
0
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