GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 337)

DV-300 Adjustable Speed Drives
——— FUNCTION DESCRIPTION ———
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2. Drive used as a winder – winding side = down
M
W[-]
DRIVE
R
Line speed
T[-]
M
Nip roll Winder
Winder side = Down
Wind/unwind = Winder
Figure 6.17.14: Drive used as a winder – winding side = down
If the speed demand function is used, the system creates a negative speed reference; it is therefore necessary to
connect the motor so that, with this polarity, the coil winds the material starting from the lower side. The wind-
ing torque is negative.
3. Drive used as an unwinder – unwinding side = up
M
W[-]
DRIVE
R
Line speed
T[+]
M
Nip roll Unwinder
Winder side = Up
Wind/unwind = Unwinder
Figure 6.17.15: Drive used as an unwinder – unwinding side = up
If the speed demand function is used, the system creates a negative speed reference; it is therefore necessary
to connect the motor so that, with this polarity, the coil unwinds the material starting from the upper side. The
unwinding torque is positive.