BENSHAW RSi GM2 Series - No Motor Trip; Low Voltage Trip 2

Learning Protection Features
174
GM2 Series VFD
890054-00-00
No Motor Trip
The inverter can detect a low motor current condition and will trip on a “no motor trip” fault (nmt)
if the inverter output current is below the Pr.32 detection level for the Pr.33 detection time. The
inverter responds to a no motor trip condition when Pr.31 (No Motor detection) is set to (1) Free-
Run. Pr.31 may be set to (0) None (default) for testing with no motor connected.
Group
Code
Name
Setting
Setting Range
Unit
Pr
31
No motor motion at
detection
0
None
0–1
-
1
Free-run
-
-
32
No motor detection
current level
5
1–100
%
33
No motor detection time
3.0
0.1–10
sec
No Motor Trip Setting Details
Code and
Features
Description
Pr.31 No Motor
Detection
0: None → No action.
1: Free-Run → Activates trip based on Pr.32 and Pr.33 settings.
Inverter will coast to a stop.
Pr.32 No Motor
Level,
Pr.33 No Motor
Time
If the output current [based on the motor rated current (bA.13)] is
lower than the value set at Pr.32 (No Motor Level), and if this
continues for the time set at Pr.33 (No Motor Time), a ‘no motor trip’
occurs.
If bA.07 (V/F Pattern) is set to 1 (Square), a ‘no motor trip’ may occur due to lower output
current. If so, set Pr.32 (No Motor Level) to a lower value than the factory default.
Low Voltage Trip 2
When Pr.82 (LV2 Selection) is set to Yes (1) and when a low voltage condition occurs, the inverter
will trip and display the Lu2 fault. When the voltage recovers, the Lu2 trip will not automatically
clear. A fault reset of the inverter is required. The fault history will not be saved.
Group
Code
Name
Setting
Setting Range
Unit
Pr
82
LV2 Selection
Yes (1)
0/1
-