Chapter 5 Description of Function Parameters
Functional Code PC Motor Rated Current Setting Range: 11~1200
Factory Default Setting: Set according to the specifications
Function Description: This parameter should be set in conformity with rated current
value displayed on specifications label of the motor. Otherwise, it may cause big
deviation between starting current and protective current. The motor rated current
set by PC should not be 20% lower than the nominal current of soft starter. The
flexibility tolerance of protective trip action will increase if there is less motor rated
current set by PC.
Functional Code Pd Motor Protection Setting Range: 00~90 Factory Default Setting: 00
1) Descriptions of Protective Functions
This motor soft starter has perfect protective functions to guarantee safety while using
soft starter and motor. While in use, DO set proper protection classes and protection
parameters according to different circumstances.
Soft Starter Overheat Protection: Overheat protection enabled when temperature rises
to 90
5
and disabled when temperature falls to 60
(lowest).
Input open phase protection lag time: <3S
Output open phase protection lag time: <3S
Three-phase Unbalance Protection Time: <3S. Based on the rule that all phases of
current deviation is larger than 50 10%, when load current is 30% lower than the
nominal rated value of softer starter, the decision datum deviation will be enhanced.
Overcurrent Starting Protection Time: This refers to the protection time that is
successively 5 times longer than the maximum working current set by the code P4. See
protection Time Table in Page 23.
Overload Running Protection Time: This refers to the inverse time thermal relief
protection based on the maximum working current set by the code P4. See the curve of
trip protection time in the figure on page 26.
Power Supply Undervoltage Protection Lag Time: When power supply voltage is 40%
lower than limit value, the protection time will be less than 0.5 second; when the
power supply voltage is lower than the set value, the protection time will be less than 3
seconds.
Power Supply Overvoltage Protection Lag Time: When power supply voltage is 130%
higher than limit value, the protection time will be less than 0.5 second; when the
power supply voltage is higher than the set value, the protection time will be less than
3 seconds.
Load Shortcut Protection Retarding Time: <01 second. If the current is 10 times or
more as nominal rated current of the soft starter, than a fuse or shortcut device shall be
used.
The above time parameters are set for the period from valid signals are detected to trip
protection command is given. They are for reference only.
If protective functions of this soft starter do not comply with users needs, then
special protective devices shall be used to insure safety.
Chapter 5 Description of Function Parameters
2) Protective Trip Curve
T(S)
Level 10
Level 20
Level 2
Motor Thermal Protection Trip Time Curve (Heat State)
