5
-26
Protection Function Parameters: L
The following settings are made with the protection function parameters (L parameters): Motor selection func-
tion, power loss ridethrough function, stall prevention function, frequency detection, torque limits and hard-
ware protection.
Motor Overload: L1
Parame-
ter
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Access
Level
RS-422A/
485
Register
Page
LCD Display
L1-01
Motor protec-
tion selection
Sets whether the motor overload
function is enabled or disabled at
electric thermal overload relay.
0: Disabled
1: General-purpose motor protec-
tion
In some applications when the
Inverter power supply is turned
off, the thermal value is reset, so
even if this parameter is set to 1,
protection may not be effective.
0 or 1
1
No
Q
480H
4-7
6-33
MOL Fault Sel
L1-02
Motor protec-
tion time
parameter
Sets the electric thermal detection
time in seconds units.
Usually changing this setting is
not necessary.
The factory setting is 150% over-
load for one minute.
When the motor's overload resis-
tance is known, also set the over-
load resistance protection time for
when the motor is hot started.
0.1 to
5.0
1.0 min
No
A
481H
6-33
MOL Time
Const
L1-03
Alarm opera-
tion selection
during motor
overheating
Set H3-09 to E and select the
operation when the input motor
temperature (thermistor) input
exceeds the alarm detection level
(1.17 V).
0: Decelerate to stop
1: Coast to stop
2: Emergency stop using the
deceleration time in C1-09.
3: Continue operation (OH3 on
the Operator flashes).
0 to 3
3
No
A
482H
6-35
Mtr OH Alarm
Sel
L1-04
Motor over-
heating opera-
tion selection
Set H3-09 to E and select the
operation when the motor temper-
ature (thermistor) input exceeds
the operation detection level (2.34
V).
0: Decelerate to stop
1: Coast to stop
2: Emergency stop using the
deceleration time in C1-09.
0 to 2
1
No
A
483H
6-35
Mtr OH Fault
Sel
L1-05
Motor temper-
ature input fil-
ter time
parameter
Set H3-09 to E and set the primary
delay time parameter for motor
temperature (thermistor) inputs in
seconds.
0.00 to
10.00
0.20 s
No
A
484H
6-35
Mtr Temp Filter
