Chapter 7 Test runing and application
20
control parameters, PR5300 series soft starter is based on this parameter benchmark, by controlling
the output voltage, make the motor speed up in a smooth start-up process, not a mechanical control,
regardless of time t. Acceleration is smooth. In view of this, when the load is light, set the start time
often less than the starting time, as long as a smooth start is normal.
In general, the voltage ramp start mode is suit to not strict starting current requirement and
strict demanding of a smooth start of the occasion.
7-2-3.Kickstart mode
P9 setting item set to 2 or 3, starter model is for this mode.
Figure 7- 4 and Figure 7- 5 shows the kickstart mode waveform of the output. In some heavy
load situations, due to mechanical e;ffects of static friction, when it can not start the motor, you can
use this start mode. At the start, imposing a high fixed voltage to the motor first and last for a
limited period of time, to overcome the static friction of the load of the motor to rotate, then to start
at the method of the current limit (Figure 7- 4) or the voltage ramp (Figure 7-5)
Before using this model, start motor with non-sudden jump model, if the motor can not
move due to static friction, then use this model; otherwise avoid to start this mode to reduce the
unnecessary high current impact..
7-2-4.Current ramp start mode
P9 items set 4, start mode is for this mode.
Figure 7- 6 shows the Current Ramp start mode output current waveform, which I1 is the
current limit set P5, T1 value is the time set by P1.
Current ramp start mode has a strong acceleration ability, for bipolar motors, can also shorten
the start-up time within a certain range.
Figure 7- 4 Figure 7- 5 Figure 7- 6
7-2-5.The voltage limiting double loop start mode
P9 Set PB as 5 to set start mode for this mode.
Double loop starting voltage limiting mode adopt voltage ramp and current limit dual closed-
loop control model, is both stable requires and strict current limiting demanding, the integrated
starter-limiting mode, it uses the prediction algorithm to estimate the work status of the motor.
In this start mode, output voltage waveform will be based on the motor and load conditions
vary.
7-2-6.Monitoring start mode
In this mode, it will start at direct startup method, can monitor the working current parameters
of the motors.When overload, overvoltage or undervoltage, the fault output terminal 5 and 6 will
be disconnect and stopoutput, also shows the corresponding fault information.
7-3.PR5300 series soft starter's stop mode and application
PR5300 series soft starters, there are two stop modes, soft-stop mode and free stop mode.
7-3-1.Soft stop mode
When Setting item P2 is not zero, set the stop mode for this mode.
In this stop mode, the motor power start from the bypass contactor and switch to the output of
soft starter thyristor, soft starter output voltage decrease steadily from the total pressure, reducing
the motor speed steady in order to avoid mechanical shock, till the motor stops running. Soft stop
output cut-off voltage equal to the initial voltage of starting.
C
T
Un100%
100ms
Figure 7.5
U1
0
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