C
L E A R
P
A T H
U
S E R
M
A N U A L
R
E V
.
1 . 9 7
6 1
S
ETTING A
PW
ng” by ClearPath. This gives the user a
n the
enough” to) 50%.
M
D
EADBAND
(O
PTIONAL
)
The deadband expands the range about the 50% PWM mark that is
n erpreted as the “zero torque setti
i t
reliable way to ensure that motor torque is completely turned off whe
PWM duty cycle is set at (or “close
Max. Torque
(CCW Rotation)
Torque = 0
Duty Cycle
Deadband
(+/- 5%)
10
20
30
40
50
60
70
80
90
100
0
Max. Torque
(CW Rotation)
+/- 5% PWM deadband setting
Why use a deadband?
In bi-polar mode, turning off torque is achieved, in theory, by applying a
50% duty cycle PWM signal to Input B. However, it can be difficult to set a
perfect 50% duty cycle. In fact, a very small amount of torque may still be
produced by the motor, even when duty cycle is apparently set to 50%. A
deadband helps guarantee torque is fully off when you expect it to be.
Example: If the user sets a +/-5% deadband, any PWM signal with a
duty cycle between 45% and 55% (i.e., in the deadband) is interpreted as a
zero-torque command by ClearPath.
Note: As deadband setting increases, the slope of torque vs. duty cycle
increases as illustrated below.
T
EKNIC
,
I
NC
.
F
AX
(585)784-7460
V
OICE
(585)784-7454
