BENSHAW RSi-030-SG-4B, Service Manual

Page: 90 / 116

Pub # 890046-10-00
Dec. 2015
Section 4, Page
8
of
32
4.3 Overload Faults
The model SG drives have two different motor overload protection settings along with drive
overload protection. Each is described below.
A. E-Thermal
B. Overload
C. Inverter Overload
A. E-Thermal
Fault Display: E-THERMAL Auto Resettable
: No
Related Parameters: DRV-05
– Motor rated current.
DRV-06
–
ETH select
Yes/No, activate or deactivate the
protection, default set to yes.
DRV-07
–
ETH 1 min
default 130% for one minute,
programmable.
DRV-08
–
ETH continuous
100% continuous (
service factor
, set
to motor nameplate).
DRV-09
– Motor Type
Self Cooled
motor to address slow speed
heating (under 20 Hz).
Force cooled
disables the slow speed
factor.
Description:
The ETH function is an electronic overload (I²t) calculation that monitors motor
amps along with speed of the motor to detect motor overload and motor overheating conditions.
Parameter DRV-07 is the one-minute trip level (% of DRV-05) and DRV-08 is the motor service
factor. Amps above service factor amps are used to determine overload. Also, at any speed
below 60 Hz. motor heating is a factor in the calculation, especially at slow speeds below 20 Hz.
The fault cannot be reset immediately. There is a required cool down period (thermal retention)
of 1 minute.
Check Fault History:
At parameter AFN-01 (most recent fault), hit the program button, then up
arrow to view data captured at time of fault (Hz, Volts, Amps, Status). AFN-02 through AFN-05
are previous faults.