Protection Function Parameters - DEMA D5M Series Manual

NO.6 Detailed Function Description

6.6 Protection function parameters

P118
Selection of overvoltage stall
prevention
0: Overvoltage stall prevention function is invalid
is valid
During inverter deceleration, the motor shall produce rebound energy into inverter under the
influence of load inertia to make the voltage on inverter DC side rise; while overvoltage stall
function is started and inverter DC voltage is overhigh, the inverter shall stop decelerating till
DC side voltage is lower than set value, and for the inverter is decelerating, deceleration time
shall automatically prolong.
P119
Stall level during acceleration
During inverter acceleration, output current of the inverter shall rise rapidly due to overload or
excessively short acceleration time, and the inverter shall stop accelerating while exceeding
rated set level; when the current is lower than set value, the inverter shall continue
accelerating.
[Note] 100% current refers to rated current of the motor, and when the parameter is set
to 0, stall prevention function is invalid during acceleration.
P120
Stall level during constant speed
During constant running of variable frequency accelerator, the current increases due to
fluctuation of load or other reason; when the current exceeds rated set value, the inverter
shall decrease output frequency, and if output current returns to normal, the inverter shall
reaccelerate up to set frequency.
P121
Deceleration time for stall
prevention during constant speed
When the inverter is applied to the load of fans and pumps, P120 can be set as 120%; when
the current of inverter is greater than 120%, output frequency shall decrease, consequently
the current shall decrease; however, after the current returns to normal, the frequency also
shall become normal gradually, thus achieving stall prevention function; decrease rate of the
frequency depends on P121.
P122
56
Setting range Unit
0-1
1: Overvoltage stall prevention function
Setting range Unit
0-200% 1%
Setting range Unit
0-200% 1%
Setting range Unit
0.1-25.5s 0.1s
Setting range Unit
Ex-factory
value
1 1
Ex-factory
value
150
Ex-factory
value
0
Ex-factory
value
5.0
Ex-factory
value
Alteration
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