DFE WebHandler 3 Instruction Manual page 38

3. Soft Start
Soft start is normally used only in braked
controller is being used to control rewind or intermediate tension because it serves no purpose and it may
not be possible to leave soft start. Soft start can be actuated in one of three ways; 1. by sensing a loss of
tension, 2. by closure of an external contact, or 3. low machine line speed (see Options). It is possible to
actuate Soft Start using one or more sources at a time.
a.
ACTUATION BY LOW TENSION
(1) No external electrical connections are needed for actuation. Navigate to
choose "On".
(2) Navigate to
to 100% of maximum output. It is best to set it low, but high enough to produce enough tension
to exceed the trip point tension or the controller may not be able to get out of Soft Start. Factory
preset is 20% of full output.
(3) Navigate to
eliminates nuisance actuation if tension drops for only a short time. The range is 1 to 60
seconds. There is no delay when leaving the Soft Start mode.
(4) Navigate to
0 to 100% of the tension meter scale*. Avoid setting the trip point close to your operating
tension. Set it much lower, instead. Be sure the
produce enough tension to exceed the trip point tension.
* Factory preset is 10% of the tension meter scale.
b.
ACTUATION BY EXTERNAL CONTACT CLOSURE.
(1) Connect the external switch or relay contact as shown. The controller will remain in the Soft
Start mode as long as the contact is closed. TB101 is on the Terminal Board. See Figure 11.
Figure 32 - SOFT START BY EXTERNAL CONTACT CONNECTIONS
(2) Navigate to
(3) Navigate to
range is about 0 to 100% of maximum output. Factory preset is 20% of maximum output. Avoid
setting the output higher than the operating tension. It is best to set it low, but high enough to
produce enough tension to create a smooth takeoff. Soft Start actuates immediately upon contact
closure. There is no time delay. There are no other adjustments.
c.
ACTUATION BY LINE SPEED
(1) Verify that line speed is configured and calibrated as described in Section 3.3
(2) Navigate to
(3) Navigate to
start will activate when line speed drops below this threshold. When your controller is in Soft
Start mode, the second line of the display will flash between the normal screen and one that says
"SS". When you leave Soft Start mode the second line will remain steady.
UNWIND
. This is the standard configuration.
SS Output Level
and adust to the output you want while in Soft Start. The range is 0
Soft Start Delay
and enter a short time delay before Soft Start actuates. This
SS Tension Trip Pt.
and enter the tension which will actuate Soft Start. The range is
SwitchSoftStart
and select "On"
SS Output Level
and enter or adjust the output you want while in Soft Start. The
Speed SoftStart
and select "ON".
SS Speed Trip Pt.
and choose a level which is about 10% of your maximum. Soft
zone applications. Turn off soft start when the
SS Output Level
32
Tension SoftStart
value is set high enough to
and