ABB PST Series User Manual

122 1SFC132003M0201
)XQFWLRQV
&KDSWHU
 6WHSGRZQYROWDJH
3DWKLQPHQX
0HQX6(77,1*6)XQFWLRQDO6HWWLQJV
6WDUW6WRS6WHS'RZQ
When stopping a motor using the stop ramp, the speed
will not decrease immediately. The step down voltage
function makes it possible to set a level where the motor
speed decreases as soon as the stop ramp begins. By
this, a more optimised stopping of the motor is achieved
and it is mainly used for pump applications
 &XUUHQWOLPLW
3DWKLQPHQX
0HQX6(77,1*6)XQFWLRQDO6HWWLQJV
6WDUW6WRS&XUUHQW/LP
It is possible to limit the starting current by using this
function. When the current limit is reached, the output
voltage stays stable until the current level falls below the
limit, then the ramping continues.
7KHVWDUWLQJFXUUHQWPXVWEHKLJKHQRXJKWRPDNHLWSRVVL
EOHIRUWKHPRWRUWRUHDFKWKHUDWHGVSHHG7KHORZHVWSRV
VLEOHFXUUHQWGHSHQGVRQWKHSHUIRUPDQFHRIWKHPRWRUDQG
WKHFKDUDFWHULVWLFVRIWKHORDG
3DUDPHWHU
WH[W
'HIDXOWYDOXH 6HWWLQJUDQJH 'HVFULSWLRQ
Step Down 100% 30...100% Voltage value to
which the soft-
starter shall step
down at stop and
where it shall
commence the
stop ramp.
)LJXUH 6WHSGRZQYROWDJHIRU6WRSUDPS
Example 50%
Stop
Time
Initial voltage 30%
(=end voltage 30%)
3DUDPHWHU
WH[W
'HIDXOWYDOXH 6HWWLQJUDQJH 'HVFULSWLRQ
Current Lim 4,0 x I
e
2,0...5,0x I
e
Level of the
current limit
)LJXUH &XUUHQWOLPLW
)L[HG)
Fixed voltage
Reached set
level of current limit
t1+t2 = set ramp time
Set level
of current lim
it
Time
Time

ABB PST Series Specifications

General

Brand	ABB
Model	PST Series
Category	Controller
Language	English