5
Instructional Lea 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 terminal +A1. 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
•
terminal +A1
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 parametersTable 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% —
To Next Page
Loading...
Need help?
General
