Magnetek IMPULSE G+ Mini, Техническое руководство

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IMPULSE
®
•G+ Mini Technical Manual
November 2020
Page 106
5.7 Protection Parameters
The IMPULSE
®
•G+ Mini has the ability to protect itself and the motor by allowing various means to detect and take
corrective action when a condition occurs. These include motor overload detection, torque detection, and the ability
to perform a self-diagnostic check, and then resume operation after a fault is cleared.
• L1 Motor Overload
• L2 Power Loss Ride Thru
• L3 Stall Prevention
• L4 Reference Detection
• L6 Torque Detection
• L8 Hardware Protection
• L9 Automatic Reset
5.7.1 Motor Overload
The IMPULSE
®
•G+ Mini 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 VFD output current, frequency
and time to protect the motor from overheating. This time is based on a “hot start” for the motor.
See Figure 5-27 .
When the thermal overload fault is activated, an “OL1” trip occurs, shutting OFF the VFD output and preventing
excessive overheating in the motor. As long as the VFD is powered up, it continues to calculate the motor
temperature.
When operating several motors with one VFD, use the internal thermal protection from the motor in accordance
with NEC 430.126 (c) or install an external thermal overload relay on each motor and disable the motor overload
protection, L01.01 = “00”.
Parameter Name Function Range Default
L01.01 Motor Overload Fault Select Enable/disable motor overload detection. 00–03 03
00 Disabled Disables the motor thermal overload protection
01 Standard Fan Cooled 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.
02 Standard Blower Cooled Selects a motor capable of cooling itself over a
10:1 speed range when running at 100% load. The
OL1 function derates the motor when it is running
at 1/10th of its rated (base) speed or less.
03 Vector Motor Selects a motor capable of cooling itself at any
speed when running at 100% load. Includes zero
speed. The OL1 function does not derate the
motor at any speed.
L01.02 Motor Overload Time Const Time for OL1 fault when motor current is
≥
150% of
the motor rated current. Hot start.
See Figure 5-27 .
0.1–5.0 min 1.0