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SPX advanced – description of parameters
SPX ADVANCED APPLICATION MANUAL
SVCH0203—October 2017 www.eaton.com
5.13.13 Encoder fault function
Encoder supervision gives fault in case there are no pulses
from encoder. Requirement is that reference is above 1 Hz
and torque can reach 100 % level. This torque level can be
adjusted by Iq Fault limit parameter.
Code
ID
Description
Notes
P1.12.12.1
1801
Encoder Fast Hz Limit
Frequency limit where detection is made using fast detection.
P1.12.12.2
1805
Fast Time Limit
Delay to encoder fault when fault happens above Encoder Fast Hz Limit.
P1.12.12.3
1800
Iq Fault Limit
This defined Iq current limit what must be exceeded before situation is determine to be
encoder fault is pulses are missing from encoder at the same time.
5.13.14 Cold weather function
The Cold Weather Function supply’s a selectable ac voltage
to the motor at a very low frequency for a desired period
of time along with dropping the temperature fault level.
This design is uses the current draw through the IGBT
modules to warm up the unit temperature. The drive has
a low temperature fault point of -10deg C which in most
applications is sufficient. In extreme temperature regions
this is to high, In these cases the Cold Weather Parameter
can be enabled which takes the -10deg C fault level and
moves it down to -30deg C with an Alarm at -20deg C. The
adjustable frequency drive will start the motor up in its
normal operation when the unit temperature is above the
-20deg C level. If the drives unit temp is between -20deg
C and -30deg C and the drive is stopped, when the run
command is given the drive will go into the cold weather
warm up feature.
The cold weather warm up feature runs the motor at 0.5Hz
for the Cold Weather Voltage Percentage (0 to 20%) to base
off motor name plate voltage for a desired time between
(0 to 10 min) with an A85 alarm displayed on the keypad.
If the drive does not warm up above -20deg C in the time
set the drive will go into the F13 Under Temperature Fault,
otherwise if the temp does go above -20deg C it will ramp
up to the supplied reference signal. The fault can be reset
and the sequence can be started again to get the motor
running. If the unit temperature is below -30deg C the
drive will fault on the F13 Under Temperature Fault.
There is also an override feature added but Eaton would
suggest contacting the Support group before performing
this action, when in this mode there will be an A86 Under
Temp Override alarm.
Code
ID
Description
Notes
P1.12.13.1
1490
Cold weather enable
Enables the cold weather function.
P1.12.13.2
1491
Cold weather voltage
This is the voltage used when the Cold weather mode is active
P1.12.13.3
1492
Cold weather timeout
This is the maximum time the drive will attempt to heat up, if this time is exceeded the
drive will display a fault.
5.13.15 Thermal De-rate
This function allows the user to set a temperature level
and de-rate percentage that the drive will use when the
user entered temperature is exceeded. This is useful in
applications where running is preferred over a fault. This
function allows the drive to reduce the motor current to
attempt to avoid an over temperature fault. A PI loop is used
to reduce the current limit until either the maximum de-rate
limit is hit or the drives temperature stabilizes.
Code
ID
Description
Notes
P1.12.14.1
1680
Thermal De-rate enable
Frequency limit where detection is made using fast detection.
P1.12.14.2
1681
Fast time limit
This is the voltage used when the Cold weather mode is active
P1.12.14.3
1682
De-rate percent
This is the maximum derating percentage. This value is applied to the current limit
This limit may need adjustment when torque limit is below
100 %. Alternative method to detect encoder fault is Speed
Error detection.