L: Protection Function Constants - YASKAWA Varispeed G7 Series 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.
Name
Con-
stant
Display
Number
Motor pro- Sets whether the motor over-
tection load function is enabled or dis-
selection abled at electric thermal
overload relay.
0: Disabled
1: General-purpose motor
2: Inverter motor protection
3: Vector motor protection
In some applications when the
L1-01
Inverter power supply is
MOL Fault
turned off, the thermal value is
Select
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.
Motor pro- Sets the electric thermal detec-
tection time tion time in seconds units.
constant Usually setting is not necessary.
The factory setting is 150%
overload for one minute.
L1-02
When the motor's overload
MOL Time
resistance is known, also set the
Const
overload resistance protection
time for when the motor is hot
started.
Alarm oper- Set H3-09 to E and select the
ation selec- operation when the input motor
tion during temperature (thermistor) input
motor over- exceeds the alarm detection
heating level (1.17 V).
0: Decelerate to stop using the
L1-03
1: Coast to stop
MOL Thm
2: Emergency stop using the
Input
3: Continue operation (H3 on
Setting
Description
Range
protection
0 to 3
0.1 to
5.0
0 to 3
deceleration time in C1-02.
deceleration time in C1-09.
the Operator flashes).
Control Methods
Change
Open
Factory during
V/f Loop
Setting Opera-
V/f with Vec-
tion
PG tor
1
1 No Q Q Q
1.0 min No A A A
3 No A A A
User Constant Tables
MEMO-
Open
BUS
Flux Loop
Page
Regis-
Vec- Vec-
ter
tor tor
2
4-8
Q Q 480H
6-58
A A 481H 6-58
A A 482H 6-61
5-
59