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SPX advanced – description of parameters
SPX ADVANCED APPLICATION MANUAL
SVCH0203—October 2017 www.eaton.com
5.13.7 4mA Protection
The 4 mA protection monitors the analog input signal level
from Analog input 1 and Analog input 2. The monitoring
function is active when signal range 4 mA – 20 mA is
selected. A fault or warning is generated when the signal
falls below 3.5 mA for 5 seconds or below 0.5 mA for 0.5
seconds.
5.13.8 Under load protection
The purpose of the motor under load protection is to ensure
that there is load on the motor when the drive is running.
If the motor loses its load there might be a problem in the
process, e.g. a broken belt or a dry pump.
The under load curve is a squared curve set between
the zero frequency and the field weakening point. The
protection is not active below 5Hz (the underl oad time
counter is stopped).
Code
ID
Description
Notes
P1.12.6.1
1838
Response to the 4mA reference fault “4mA input fault”
0 = No response
1 = Warning
2 = Warning, the frequency from 10 seconds back is set as reference
3 = Warning, the Preset Frequency is set as reference
4 = Fault, stop mode after fault according to Stop Function
5 = Fault, stop mode after fault always by coasting
P1.12.6.2
728
4mA Reference fault: preset frequency reference “4mA fault freq.”
If value 3 in parameter P1.12.6.1 is selected and a fault occurs the frequency reference
to the motor is the value of this parameter.
Code
ID
Description
Notes
P1.12.7.1
713
Under load protection “underload protec”
0 = No response
1 = Warning
2 = Fault, stop mode after fault according to Stop Function
3 = Fault, stop mode after fault always by coasting
If tripping is set active the drive will stop and activate the fault stage.
Deactivating the protection by setting the parameter to 0 will reset the underload time
counter to zero.
P1.12.7.2
715
Under load protection, zero frequency load “UP f0 torque”
The torque limit can be set between 5.0—150.0 % x T
nMotor
.
This parameter gives the value for the minimum torque allowed with zero frequency.
The torque values for setting the under load curve are set
in percent which refers to the nominal torque of the motor.
The motor’s name plate data, parameter motor nominal
current and the drive’s nominal current IH are used to find
the scaling ratio for the internal torque value.
