BENSHAW RSi H2 Series - Electronic Thermal Prevention (ETH)

Parameter Descriptions
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890053-00-02
5.8.9 PRT-40 Electronic Thermal Prevention (ETH)
ETH is an electronic thermal protective function that uses the output current and the speed of the
motor to predict a rise in motor temperature without a separate temperature sensor. Protection of
the motor is based on current, time and speed. The inverter responds to an ETH fault based on
the setting of parameters PRT-40 (ETH Trip) through PRT-43 (ETH Continuous).
Group
Code
Name
LCD Display
Parameter Setting
Setting range
Unit
PRT
40
Electronic thermal
prevention fault selection
ETH Trip Sel
0
None
0–2
-
41
Motor cooling fan type
Motor Cooling
0
Self-cool
-
-
42
Electronic thermal one
minute rating
ETH 1 min
120
100–150
%
43
Electronic thermal
prevention continuous
rating
ETH Cont
100
50–150
%
Electronic Thermal (ETH) Prevention Function Setting Details
Code
Description
PRT-40
ETH Trip Sel
ETH can be selected to provide motor thermal protection. Select 1 (Free-
Run) or 2 (Dec) to activate the ETH function and to determine the stop
method when an ETH fault occurs. The LCD screen displays “E-
Thermal”.
Setting
Function
0
None
The ETH function is not activated.
1
Free-Run
The inverter output is blocked. The motor coasts to a
stop (free-run).
2
Dec
The inverter decelerates the motor to a stop.
PRT-41
Motor Cooling
Select motor cooling type (fan configuration) attached to the motor.
Setting
Function
0
Self-cool
The cooling fan is connected to the motor shaft and the
cooling effect varies with motor speed. Most
universal induction motors have this design.
1
Forced- cool
Motor includes a separately powered cooling fan which
provides extended operation at low speeds.