BENSHAW RSi GM2 Series - 7 RS-485 Communication Features; 7.1 Communication Standards

Learning Protection Features
GM2 Series VFD
169
890054-00-00
Under Load Fault and Warning
The inverter can be set to monitor and trip if needed, when low motor current conditions exist
during operation. This will protect against pump cavitation, deadhead and dry running operating
conditions. Set Pr.27, Under load fault selection to Free-Run or Decelerate to enable the protection.
Current detection levels are set with Pr.29 and Pr.30. Either Relay1 or Relay2 (OU.31 or OU.33) can
be set to 7 (Under Load) to provide an output signal.
Group
Code
Name
Setting
Setting Range
Unit
Pr
04
Load level setting
0
Normal Duty
-
-
25
Under load
warning selection
1
Yes
0–1
-
26
Under load
warning time
10.0
0–600
sec
27
Under load fault
selection
1
Free-Run
-
-
28
Under load fault
time
30.0
0–600
sec
29
Under load lower
limit level
30
10–100
%
30
Under load upper
limit level
30
10–100
%
OU
31
Multi-function
(digital) relay1
item
7
Under Load
0 - 44
-
33
Multi-function
(digital) relay2
item
Under Load Trip and Warning Setting Details
Code and
Features
Description
Pr.27 UL Trip Sel
Sets the inverter reaction to an under load condition. If set to 0
(None), underload is not monitored. If set to 1 (Free-Run), the output
is blocked and the motor coasts to a stop. If set to 2 (Dec), the motor
decelerates, then stops.
Pr.25 UL Warn Sel
To activate an under load warning, set to 1 (Yes) and set one of the
relay outputs, Relay1 or Relay2 (OU.31 or OU.33) to 7(UnderLoad).
Pr.26 UL Warn
Time,
Pr.28 UL Trip Time
Delay times can be set to provide a warning signal (via the output
relays) after the time set in Pr.26, UL Warn Time and a trip after the
time set in Pr.28, UL Trip Time. This function does not operate if
energy-saving operation is activated at Ad.50 (E-Save Mode).