IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 160
5.7 Protection Parameters
•
L01 Motor Overload
•
L02 Power Loss Ride Thru
•
L03 Stall Prevention
•
L04 Speed Agree
•
L05 Test Mode
•
L06 Torque Detection
•
L08 Hardware Protection
•
L09 Automatic Fault Reset
•
L09 Fault Latch
5.7.1 Motor Overload
The IMPULSE•G+/VG+ Series 4 VFD has an electronic overload protection function (OL1) for protecting the motor
from overheating. The VFD bases the protection on time, output current, and output frequency. The electronic
thermal overload function is UL-recognized, so an external thermal overload relay is not required for single motor
operation.
This parameter selects the motor overload curve used according to the type of motor applied.
L01-01 = 1 selects a motor with limited cooling capability below rated (base) speed when running at 100% load.
The OL1 function derates the motor any time it is running below base speed.
L01-01 = 2 selects a motor capable of cooling itself at any speed when running at 100% load. The OL1 function
derates the motor when it is running at 1/10 of its rated speed or less.
L01-01 = 3 selects a motor capable of cooling itself at any speed when running at 100% load. This includes zero
speed. The OL1 function does not derate the motor at any speed.
If the VFD is connected to a single motor, the motor overload protection should be enabled
Do not disable OL1 unless another means of preventing motor thermal overload is provided. When the electronic
thermal overload function is activated, an OL1 fault occurs, shutting OFF the VFD’s output, thus preventing
additional overheating of the motor. The motor temperature is continuously calculated as long as the VFD is
powered up.
When operating several motors with one VFD, install a thermal relay on each motor and disable the motor overload
protection (L01-01 = 0).
Table 5-87: Motor Overload Parameter Settings
Parameter
Display
Function
Range
Default
L01-01
Mtr OL Charact
Sets the type of motor overload protection.
0–3
3
0 OL1 Disabled
1 VT Motor
General purpose motor (standard fan cooled)
2 CT Motor
Speed range of 1:10
3 Vector Motor
Speed range of 1:100
L01-02
MOL Time Const
Time for OL1 fault when motor current is
150% of the motor rated current.
0.1–5.0 min
1.0
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