Westpow STR.B Series User Manual page 10

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6.2 Current Limit 6.2 Current Limit
At the Current Limiting mode, the output voltage increases quickly until At the Current Limiting mode, the output voltage increases quickly until
the output current reaches the limited current value Im. See figure 6-2. 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 And then the output current maintains below this limited value. Then the
output voltage is increased gradually, and the motor accelerate gradually; output voltage is increased gradually, and the motor accelerate gradually;
when the motor's speed is close to the rate speed the output current when the motor's speed is close to the rate speed the output current
decreases quickly to the rate value Ie, the starting process finish . The decreases quickly to the rate value Ie, the starting process finish . The
limited value can be set according to the load instance. The range of this limited value can be set according to the load instance. The range of this
parameter is 0.2-4Ie. parameter is 0.2-4Ie.
This mode is used in the state in which the current is very important. This mode is used in the state in which the current is very important.
Special in the state in which the grid capacity is small. The parameter of Special in the state in which the grid capacity is small. The parameter of
the Current Limit Multiples should be set 2.5-3. If this value is small, the the Current Limit Multiples should be set 2.5-3. If this value is small, the
starting will be abnormal. At this mode, the time of starting is concerned to starting will be abnormal. At this mode, the time of starting is concerned to
the parameter of the Current Limit Multiples. The more this value is, the the parameter of the Current Limit Multiples. The more this value is, the
shorter the time of starting is,vice versa. For detail see chapter 8 and shorter the time of starting is,vice versa. For detail see chapter 8 and
chapter 9. chapter 9.
I I
Ï Þ Á ÷ Æ ð ¶ ¯
Current Limiting start Current Limiting start
I I
m1 m1
I I
m2 m2
I I
m3 m3
Figure 6-2
OPERATION 12
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Ie Ie
t t
6.3 6.3 Jogging Jogging
At this start mode, the output voltage reaches the initial voltage U1 At this start mode, the output voltage reaches the initial voltage U1
quickly, and remains unchanged. Changing the U1, the output voltage and quickly, and remains unchanged. Changing the U1, the output voltage and
torque of the motor will change corresponding. (See figure 6-3). It is torque of the motor will change corresponding. (See figure 6-3). It is
convenient to judge the director of the motor. convenient to judge the director of the motor.
U U
U U
1 1
U U
1 1
U U
1 1
Figure 6-2
6.4 Stop Mode 6.4 Stop Mode
There are two stop mode, user can set this parameter according to load and There are two stop mode, user can set this parameter according to load and
working condition. working condition.
Free Stop Free Stop
When receiving the stop signal, the terminals K22,K24 is open, the bypass When receiving the stop signal, the terminals K22,K24 is open, the bypass
contactor is disconnect. The trigger signal of the SCR module is blocked contactor is disconnect. The trigger signal of the SCR module is blocked
at the same time. Motor inertia stop according the load. at the same time. Motor inertia stop according the load.
Soft Stop Soft Stop
At this stop mode, when receiving the stop signal, the bypass contactor At this stop mode, when receiving the stop signal, the bypass contactor
is disconnected. At the same time, motor is controlled through SCR. The is disconnected. At the same time, motor is controlled through SCR. The
output voltage decreases gradually. At last motor stop completely. The output voltage decreases gradually. At last motor stop completely. The
Stop Time is related to the parameter of load and soft stop time factor. Stop Time is related to the parameter of load and soft stop time factor.
To gain the smooth stop effect, the To gain the smooth stop effect, the
carefully. carefully.
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t t
oft oft top ime should be set top ime should be set
OPERATION 13
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