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Accelnet & Stepnet Plus Panels User Guide
16-01339 Rev 07
PWM
I
NPUT
C
OMMANDS
T
WO
F
ORMATS
The drive can accept a pulse width modulated signal (PWM) signal to provide a current command in current
mode and a velocity command in velocity mode. The PWM input can be programmed for two formats: 50%
duty cycle (one-wire) and 100% duty cycle (two-wire).
50%
D
UTY
C
YCLE
F
ORMAT
(O
NE
-W
IRE
)
The input takes a PWM waveform of fixed frequency and variable duty cycle. As shown below, a 50% duty
cycle produces zero output from the drive. Increasing the duty cycle toward 100% commands a positive output,
and decreasing the duty cycle toward zero commands a negative output.
The command can be inverted so that increased duty cycle commands negative output and vice versa.
100%
D
UTY
C
YCLE
F
ORMAT
(T
WO
-W
IRE
)
One input takes a PWM waveform of fixed frequency and variable duty cycle, and the other input takes a DC
level that controls the polarity of the output. A 0% duty cycle creates a zero command, and a 100% duty cycle
creates a maximum command level. The command can be inverted so that increasing the duty cycle decreases
the output and vice versa.
P
ROTECTION FROM
0
OR
100%
D
UTY
C
YCLE
C
OMMANDS
In both formats, the drive can be programmed to interpret 0 or 100% duty cycle as a zero command. This
prevents the 0% or 100% commands that would result from a controller failure or a cable break which could
result in the input pulled up to +5V or pulled-down to Signal Ground (0V).
Decreasing Duty Cycle
Increasing Duty Cycle
Max -
Max +
0
PWM Input
Amplifier Output
50 % Duty Cycle
Max +
0
PWM Input
Amplifie r Output
Dire ction Input
100%
Duty Cycle
100%
Duty Cycle
Min -