Protective Functions: L - Omron SYSDRIVE 3G3FV User Manual

Advanced Operation
There are some monitor items that are limited to the 0 to +10 V signal range even when the 0- to 10-V
signal level has been selected. Refer to the table of status monitor items in page 3-12 for details.

6-5-8 Protective Functions: L

H Motor Protection Settings (L1)
Parameter Display name p y
number
L1-01 MOL Fault Select 0 or 1
Note This parameter cannot be changed during operation.
Setting
0 Disabled.
1 Enabled.
This setting enables or disables the motor overload protection function.
The rated current setting (E2-01) is used as a basis for overload detection.
Disable the motor protection function (setting 0) when two or more motors are connected to a single
Inverter. Use another method to provide overload protection separately to each motor, such as con-
necting a thermal relay to the power line of each motor.
The motor protection function may not protect a motor when the power supply is turned on and off
frequently, because the thermal value is reset each time that the power is turned off.
If the Overload OL1 alarm (1F) is set in one of the multi-function outputs (H2-01 through H2-03), the
output will be turned ON when the electronic thermal value reaches 90% of the overload detection
level.
Parameter Display name p y
number
L1-02 MOL Time Const
Note This parameter cannot be changed during operation.
Normally it isn't necessary to change this setting. (The default setting is a 150%, 1 minute endurance.)
This setting specifies the electronic thermal detection time.
Set the protection time for a 150% load imposed after hot-starting and continuously operating the
Inverter with a rated current. Set the protection time at rated speed if a general-purpose motor is used.
The rated current of the general-purpose motor will decrease if the frequency drops. Therefore, the
Inverter will automatically shorten the detection time at low frequency.
When the motor's overload endurance level is known, set the hot-start overload resistance level for
the motor, but be sure to allow some margin for safety.
Decrease this setting when you want to detect an overload more quickly.
6-98
Setting g Units Default
range setting
--- 1
Setting g Units Default
range setting
0.1 to 5.0 Minutes 1.0
Valid access levels
V/f V/f with
Control PG
Basic or Advanced
Function
Valid access levels
V/f V/f with
Control PG
Basic or Advanced
Chapter 6
Open Loop Flux
Vector Vector
Open Loop Flux
Vector Vector