5
Instructional Leafl et
IL03901003E
Effective May 2011
DS7 series soft start controllers, Frame 1 (4–12A)
EATON CORPORATION
www.eaton.com
Operations
24 Vac/Vdc, 110/230 Vac control voltage is applied to terminal U
•
s
Line voltage is applied to the starter by closing the mains
•
contactor
The soft start controller issues a RUN command by applying
•
24 Vac/Vdc, 110/230 Vac to teA1. Contacts 13 and –A2
will close when the end of the ramp time is reached (TOR)
Bypass relays close at the end of ramp time + ~0.18 seconds. It is
ote:
N
important to correctly set the ramp time, so the bypass relays will close
within 5 seconds after the motor has achieved rated RPM.
To remove the RUN command, remove control voltage from
•
teA1
If ramp STOP time is set to a value greater than 0 seconds, a
•
RAMP STOP will be performed
Adjusting the soft start controller parameters
There are three adjustments to the DS7 soft start controller:
t-Start = ramp time
•
u-Start = initial voltage (torque)
•
t-Stop = stop ramp time
•
DS7 parameters
Table 10.
Application
t-Start
t-Stop
u-Start
Breakaway
Torque
Remarks
Crusher, empty at start
20s
—
56%
75%
Possible high inertia
Conveyor, horizontal, loaded
25s
30s
76%
150%
—
Conveyor, horizontal, unloaded
25s
30s
48%
50%
—
Chiller
5s
—
37%
25%
—
Piston compressor, unloaded
10s
—
64%
100%
—
Circular saw
20s
—
48%
50%
Possible high inertia
Ball mill
20s
—
48%
50%
Eccentric load
Mixer, liquids
10s
—
37%
40%
—
Mixer, dry materials
15s
—
56%
75%
—
Pump, piston
25s
30s
82%
175%
Possible high starting torque
Pump, centrifugal
10s
30s
37%
25%
—
Escalator
10s
—
48%
50%
—
Rotary compressor, unloaded
20s
—
42%
35%
—
Agitator
15s
—
42%
35%
—
Feed screw
20s
—
82%
175%
Possible high starting torque
Press, flywheel
25s
—
76%
150%
Possible high starting torque
Drier, rotating
20s
—
64%
100%
—
Blower, axial fan, flaps open
30s
—
37%
25%
—
Blower, centrifugal fan, valve open
30s
—
35%
20%
—