IMPULSE•T Instruction Manual – October 2015
5-17
Protection Parameters
The IMPULSE•T has the ability to protect both the drive’s hardware and motor by allowing various
means to detect and take corrective action when a condition occurs. These include motor overload
detection, torque detection, the ability to perform a self-diagnostic check, and then resume operation
after a fault is cleared.
• L1 Motor Overload Protection
• L3 Stall Prevention
• L8 Hardware Protection
• L9 Automatic Reset
Motor Overload Protection
The IMPULSE•T protects against motor overload with a UL-recognized, built-in electronic thermal
overload function, so an external thermal overload relay is not required for single motor operation.
The electronic thermal overload function estimates motor temperature, based on inverter output
current, frequency, and time to protect the motor from overheating. This time is based on a “hot start”
for the motor (see Figure 5-6 “Motor Protection Operation Time”). When the thermal overload fault is
activated, an “OL1” fault occurs, shutting OFF the inverter output and preventing excessive
overheating in the motor. As long as the inverter is powered up, it continues to calculate the motor
temperature.
Table 5-21:Motor Overload Parameter Settings
Parameter
Code
Name Function Range
Initial
Value
Access
Level
L1-01 Motor Overload Fault
Select
Enable/disable motor overload
detection. The OL1 function
derates the motor any time it is
running below base speed.
00–02 02 Adv
00 Disable
01 Standard Fan Cooled A motor with limited cooling
capability below rated (base)
speed when running at 100%
load (< 10:1).
02 Standard Blower
Cooled
A motor that is blower cooled
(> 10:1).
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