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SPX advanced – description of parameters
SPX ADVANCED APPLICATION MANUAL
SVCH0203—October 2017 www.eaton.com
5.13.3 Stall protection
The motor stall protection protects the motor from short
time overload situations such as one caused by a stalled
shaft. The reaction time of the stall protection can be set
shorter than that of the motor thermal protection. The stall
state is defined with two parameters, Stall current and Stall
frequency limit.
If the current is higher than the set limit and the output
frequency is lower than the set limit, the stall state is true.
There is actually no real indication of the shaft rotation. Stall
protection is a kind of overcurrent protection.
Code
ID
Description
Notes
P1.12.3.1
709
Stall protection “Stall Protection”
0 = No response
1 = Warning
2 = Fault, stop mode after fault according to Stop Function
3 = Fault, stop mode after fault always by coasting
P1.12.3.2
710
Stall current limit “Stall Current”
The current can be set to 0 …2*I
H
. For a stall stage to occur, the current must have
exceeded this limit. The software does not allow entering a greater value than 2*I
H
.
If the motor current limit is changed this parameter is automatically recalculated to
the value 90 % of motor current limit.
This limit must be set below
the current limit in order for this
function to operate.
P1.12.3.3
712
Stall frequency limit “Stall Freq Lim”
The frequency can be set between 1-fmax (Max Frequency).
For a stall state to occur, the output frequency must have remained below this limit
for a certain time. This function requires that the output frequency is 1 Hz below the
frequency reference before the stall time count is started.
Output Freq.
Motor Current
Stall Current
Limit
Stall Freq.
Limit
Stall
Area
P1.12.3.4
711
Stall time “Stall Time Lim”
This is the maximum time allowed for a stall stage. The stall time is counted by an
internal up/down counter. If the stall time counter value goes above this limit the
protection will cause a trip.
Stall Time
Stall Trip Area
Stall
Status
Time
