L: Protection Function Constants - YASKAWA Varispeed G7 Instruction Manual

L: Protection Function Constants

The following settings are made with the protection function constants (L constants): Motor selection func-
tion, power loss ridethrough function, stall prevention function, frequency detection, torque limits, and hard-
ware protection.
Motor Overload: L1
User constants for motor overloads are shown in the following table.
Con-
stant
Number
Motor pro-
tection
selection
L1-01
MOL Fault
Select
Motor pro-
tection time
constant
L1-02
MOL Time
Const
Alarm oper-
ation selec-
tion during
motor over-
heating
L1-03
MOL Thm
Input
-58
5
Name
Description
Display
Sets whether the motor over-
load function is enabled or dis-
abled at electric thermal
overload relay.
0: Disabled
1: General-purpose motor
protection
2: Inverter motor protection
3: Vector motor protection
In some applications when the
Inverter power supply is
turned off, the thermal value is
reset, so even if this constant is
set to 1, protection may not be
effective.
When several motors are con-
nected to one Inverter, set to 0
and ensure that each motor is
installed with a protection
device.
Sets the electric thermal detec-
tion time in seconds units.
Usually setting is not necessary.
The factory setting is 150%
overload for one minute.
When the motor's overload
resistance is known, also set the
overload resistance protection
time for when the motor is hot
started.
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 using the
deceleration time in C1-02.
1: Coast to stop
2: Emergency stop using the
deceleration time in C1-09.
3: Continue operation (H3 on
the Operator flashes).
Control Methods
Change
Setting Factory during
Range Setting Opera-
V/f with
tion
0 to 3 1 No Q
0.1 to
1.0 min No A
5.0
0 to 3 3 No A
MEMO-
Open Open
BUS
V/f Loop Flux Loop
Regis-
Vec- Vec- Vec-
ter
PG tor tor tor
1 2
Q Q Q Q 480H
A A A A 481H
A A A A 482H
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