5.3.2 External terminal description5.3.2 External terminal description
Terminal NameTerminal Name Terminal functionTerminal function ExplanationExplanation
R.S.TR.S.T PowerPower Connect to three-phase power
source through breaker (QF)
Connect to three-phase power
source through breaker (QF)
U.V.WU.V.W MotorrMotorr Connect to three-phase asynchronous
motor
Connect to three-phase asynchronous
motor
PowerPower
StartStart Connect RUN and COM directly, StartConnect RUN and COM directly, Start
RUNRUN
StopStop Connect STOP and COM directly free stopConnect STOP and COM directly free stop
STOPSTOP
JogJog Connect JOG and COM directly, jogConnect JOG and COM directly, jog
JOGJOG
Reset the faultReset the fault Connect Reset and COM directly,
reset the fault
Connect Reset and COM directly,
reset the fault
RETRET
Digital inputDigital input
CommonCommon Logic GroundLogic Ground
COMCOM
K14K14
K11K11
K12K12
NONO
K24K24
K22K22
SSSS Soft stopSoft stop Connect SS and COM directly, Soft stopConnect SS and COM directly, Soft stop
User ManualUser Manual User ManualUser Manual
Table 5-1
NCNC
COMCOM
NONO
fault
output
terminals
fault
output
terminals
bypass
terminals
bypass
terminals
In Fault K14-K12close
K11-K12 open
contacts capacity AC:5A/250V
DC:10A/30V
In Fault K14-K12close
K11-K12 open
contacts capacity AC:5A/250V
DC:10A/30V
after start complete K24-K22 close
contacts capacity AC:5A/250V
DC:10A/30V
after start complete K24-K22 close
contacts capacity AC:5A/250V
DC:10A/30V
6. Control mode and working state6. Control mode and working state
Connect the terminal SS and COM, the load soft stop, and the stop time is
not adjustable.
There are twowiring of External control. See figure5-2
Connect the terminal SS and COM, the load soft stop, and the stop time is
not adjustable.
There are twowiring of External control. See figure5-2
The STRL series soft starter has three start modes: Current Limit, Voltage
Ramp and Jogging. These Start Modes is independent, users can choose
any of themaccording to theload instance andrequirement.
The STRL series soft starter has three start modes: Current Limit, Voltage
Ramp and Jogging. These Start Modes is independent, users can choose
any of themaccording to theload instance andrequirement.
6.1 VoltageRamp6.1 VoltageRamp
The waveform of the voltage shows in Figure 6-1. U0in figure is initial
output voltage. When starting, the output voltage is up to U0immediately,
and then ramps up gradually according to the parameter Start Time t
set in advance. Then the motor accelerates continuously. When the output
voltage reaches the rate value Ue, the motor reaches the rate speed.
Starting process is finished. The Initial Voltage U1and the Start Time t can
be set according to the load. The range of U0is 30~100%Ue, and the range
of t is 1~200s.
The waveform of the voltage shows in Figure 6-1. U0in figure is initial
output voltage. When starting, the output voltage is up to U0immediately,
and then ramps up gradually according to the parameter Start Time t
set in advance. Then the motor accelerates continuously. When the output
voltage reaches the rate value Ue, the motor reaches the rate speed.
Starting process is finished. The Initial Voltage U1and the Start Time t can
be set according to the load. The range of U0is 30~100%Ue, and the range
of t is 1~200s.
Voltage Ramp startVoltage Ramp start
Ue
U
U0
tt1t2
t
Figure6-1
I
Ie
t
Im1
Im2
Im3
Figure6-2
Current Limit startCurrent Limit start
6.2 Current Limit6.2 Current Limit
At the Current Limit mode, the output voltage increases quickly until the
output current reaches the limited current value Im. See figure 6-2. And
then the output current maintains below this limited value. Then the
output voltage is increased gradually, and the motor accelerate gradually;
when the motor'sspeed is closeto the rated the output currentdecreases
quickly to therated value Ie,the starting process is over. Thelimited
current value canbe set accordingto the load instance. The range of this
parameter is 100%~500%Ie (that is 1~5 times).
At the Current Limit mode, the output voltage increases quickly until the
output current reaches the limited current value Im. See figure 6-2. And
then the output current maintains below this limited value. Then the
output voltage is increased gradually, and the motor accelerate gradually;
when the motor'sspeed is closeto the rated the output currentdecreases
quickly to therated value Ie,the starting process is over. Thelimited
current value canbe set accordingto the load instance. The range of this
parameter is 100%~500%Ie (that is 1~5 times).
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