Mitsubishi Electric 800 Series Instruction Manual page 362

High-speed pulse train output circuit
(example of connection to pulse counter)
Pull up resistance
∗3
Inverter
FM
SD
Pulse of Pr.291 = "10, 11"
50% duty
Hi ∗4 Low
Pulse of Pr.291 = "20, 21, 100"
μs
Approx. 10 Approx. 10
Hi ∗4 Low
Item
Output method
Voltage between collector-emitter
Maximum permissible load current
Output pulse rate
Output resolution

50k pulses/s when the monitor output value is 100%.
NOTE
• Terminal JOG input specifications (pulse train input or contact input) can be selected with Pr.291. When changing the setting
value, be careful not to change the terminal JOG input specifications. (Refer to
• Connect a meter between the terminals FM and SD after changing the Pr.291 setting value. When using the pulse train of FM
output (voltage output), be careful that voltage is not added to terminal FM.
• A connection cannot be made to the pulse input of a source logic type.
• If all parameter clear is performed when selecting the high-speed pulse
train output (Pr.291 = "10, 11, 20, 21, 100"), the terminal FM output can
be changed from high-speed pulse train output to FM output (voltage
output), since the Pr.291 setting value returns to the initial value of "0".
Perform all parameter clear after removing the device connected to the
terminal FM.
• When Pr.291 Pulse train I/O selection = "10, 11, 20, 21, 100", this
is high-speed pulse train output for open collector output. A
maximum pulse train of 55k pulses/s is outputted.
Pulse counter
There are two types of pulse width: "50% duty" and "fixed ON
width"; this cannot be adjusted with the calibration parameter
Pr.900 FM terminal calibration.
• When Pr.291 = "10
OFF width are the same).
50% duty
• When Pr.291 = "20
width (approx. 10 μs).
• At the "100" setting, the same pulse train from the pulse train input
(terminal JOG) will be outputted. This is used when running at a
μs
synchronized speed with more than one inverter. (Refer to
308.)
High-speed pulse train output specifications
NPN open collector output
30 V (max.)
80 mA
0 to 55k pulses/s

3 pulses/s (excluding jitter)
(M) Monitor display and monitor output signal

The pulses may weaken due to stray capacitance in the wiring if the
wiring is long, and the pulse counter will be unable to recognize the
pulses. Connect the open collector output to the power source with a
pull-up resistor if the wiring is too long.
Check the pulse counter specs for the pull-up resistance. The resistance
should be at 80 mA of the load current or less.
,
11", the pulse cycle is 50% duty (ON width and
, 21, 100", the pulse ON width is output at a fixed

"HIGH" indicates when the open collector output transistor is OFF.
page 308
FM output circuit
8.2 V
Open collector output circuit
page
for pulse train input.)
3.3 kΩ Pr.291
0, 1
Terminal FM
10, 11,
20, 21, 100
361
PARAMETERS
5
GROUP
M