User`s manual

apfiff09 marine vacon • 197
24-
6
7.12.3 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.
P2.12.3.1 Stall protection ID709
0 = No response
1 = Warning
2 = Fault, stop mode after fault according to Stop Function
3 = Fault, stop mode after fault always by coasting
P2.12.3.2 Stall current limit ID710
The current can be set to 0
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.
Note: This limit must be set below the current limit in order for this function to operate.
P2.12.3.3 Stall frequency limit ID712
The frequency can be set between 1-f
max
(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.
Motor Current
Output Freq.
Stall Area
Stall Current
Limit
Stall Freq.
Limit