3540 mo, Connecting digital inputs and limit switches – Applied Motion 3540MO User Manual
Page 10
Connecting Digital Inputs and Limit Switches
The 3540 MO contains optical isolation circuitry to prevent the electrical noise
inherent in switching amplifiers from interfering with your circuits. This
arrangement also allows a wide range of input voltages to be used and gives you the
option of using sinking or
sourcing inputs.
A schematic diagram of the
input circuit is shown on the
right.
You must supply 5-24 volts DC
to supply current to the LEDs
on the input side of the
optoisolators.Your controlling
logic must be capable of
sinking or sourcing at least 3
mA at 5 volts and 10 mA at 24 volts to control each drive input. Most CMOS and
-10- -11-
Internal Tach Circuit
DIR
RUN
COM
Input Optoisolation Circuit
EN
SPD
2200
Ω
2200
Ω
2200
Ω
2200
Ω
Tach Output
The Tach Out signal is provided for measuring the motor speed. It generates 100
pulses per revolution, so if you connect a frequency counter, the speed reads out in
revs/second with two decimal places. The schematic diagram of the Tach Out
optoisolation circuit is shown below.
Do not connect the Tach output to more than 24VDC.
The current into the Tach+ terminal must not exceed 20 mA.
The HI SPEED pot sets the maximum speed (the motor speed when the analog
signal is at 5 volt DC). The range is 0 - 25 rev/sec.
Wiring diagrams and a plot of speed vs voltage are shown below.
Wiring for Speed Control by 0 - 5 Volt Analog Signal
(Direction Control by Digital Signal or Switch)
0 - 5V speed signal
signal return
3540 MO
COM
DIR
RUN
CCW
WPR
+
5-24
VDC
SUPPLY
-
direction switch
run/stop switch
(closed=run)
Wiring for Speed Control by 0 - 5 Volt Analog Signal
(Unidirectional Rotation)
0 - 5V speed signal
signal return
3540 MO
COM
RUN
CCW
WPR
CW
330
Ω
internal
tach
signal
+5V
TACH–
TACH+
Optoisolator
NEC PS2501 or equiv.
inside 3540 MO
Connecting Tach Output
to a Frequency Counter
4700
Ω
5 - 24V
DC
Power
Supply
TACH–
TACH+
–
+
Freq
Counter
3540 MO
GND
IN
Speed vs Input Voltage
EXT SPEED mode, HI SPEED pot at maximum
speed (rev/sec)
0
1
2
3
4
5
0
5
10
15
20
25