BENSHAW RSi H2 Series - Under Load Fault and Warning

Parameter Descriptions
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890053-00-02
5.8.5.1 Inverter Overload Protection (IOLT) and Warning
In addition to motor overload settings, the inverter has built in inverter overload protection. When
the inverter output current exceeds the rated current, a protective function is activated to prevent
damage to the inverter. This inverter overload protection is based on inverse proportional
characteristics.
An inverter overload warning signal (relay output) can be provided before the inverter overload
protection function operates. Set OUT-31~35 or OUT-36 to ‘6 (IOL)’. When the overcurrent time
reaches 60% of the allowed overcurrent time (120%, 1 min), the output relay will change state
(signal output at 120%, 36 sec).
Group
Code
Name
LCD Display
Parameter Setting
Setting range
Unit
OUT
31~35
Multi-function relay 1–5
Relay 1–5
6
IOL
-
-
36
Multi-function output 1
Q1 Define
5.8.6 PRT-23 Under Load Fault and Warning
The inverter can be set to trip and/or provide a warning when low motor current conditions exist
during operation. This will protect against pump cavitation, deadhead, and dry running operating
conditions. Set PRT-27, Under load fault selection to ‘1 (Free-Run)’ or ‘2 (Decelerate)’ to enable
the protection. Current detection level is set with PRT-24. A digital output (OUT-31~35 or OUT-36)
can be set to ‘7 (Under Load)’ to provide an output signal. The following table lists the under-load
fault and warning features of the H2 series inverter.
Group
Code
Name
LCD Display
Parameter Setting
Setting range
Unit
PRT
23
Under load
detection Source
UL Source
0
Output
Current
0–1
-
24
Under load
detection Band
UL Band
10.0
0.0–100.0
%
25
Under load warning
selection
UL Warn Sel
1
Yes
0–1
-
26
Under load warning
time
UL Warn Time
10.0
0–600.0
sec
27
Under load trip
selection
UL Trip Sel
1
Free-Run
0-2
-
28
Under load trip timer
UL Trip Time
30.0
0–600.0
sec
Under Load Trip and Warning Setting Details
Code
Description
PRT-23
UL Source
Select a source to detect the under-load trip. An under-load trip can be detected
using output current or output power.
PRT-24
UL Band
Set a value for the under-load fault occurrence. This value (UL Band) applies
to each frequency of the load characteristics curve made by the AP2-01 Load
Tune.
PRT-25
UL Warn Sel
Select the under-load warning options. Set an output at OUT-31–35 and 36) to
‘7 (Under load)’. The warning signals are output when under load conditions
occur.