Pulse Measurement - Panasonic KW4M User Manual

6-3-3 Pulse measurement

◇Main unit wiring diagrams
◇Input connection
・Contact input
Use highly reliable metal plated contacts. Since the contact's
bounce time leads directly to error in the count value, use
contacts with as short a bounce time as possible. In general,
select 30Hz for max. counting speed.
・Non-contact input (Transistor input)
Connect with an open collector. Use the transistor with the
following specifications.
V =20V min. I =20mA min. I
CEO C
Use transistors with a residual voltage of less than 1.5V when the
transistor is ON.
※Short-circuit impedance should be less than 1kΩ.
(When the impedance is 0Ω, drain current is approx. 5mA.)
The open-circuit impedance should be more than 100kΩ.
・Input wiring
Please wire as short as possible by using a shielded wire or a metallic electric wire tube individually.
(Caution)
The AC power supply input part is not insulated to pulse input parts. So the input equipment must
have the power supply transformer in which the secondary side is not grounded with the primary and
secondary sides insulated, in order to prevent interference of the power supply circuit when
connecting the external input circuit. Be sure not to use an auto-transformer.
AC Power supply
Do not ground the secondary side.
20
＜ Pin type ＞
=6μA max
CBO
Good example
AC power supply
(Fig.B) No Good example
Insulated
Input equipment
transformer
(sensor etc.)
(＋)
（－）
Eco-POWER
METER
＜Screw terminal type＞
(Fig.A)
Insulated
Input equipment
transformer
(sensor etc.)
(＋)
（－）
Eco-POWER
METER
AC Power supply
Auto transformer
Eco-POWER
METER
Do not use an auto-transformer.
⑤ ②
Screw terminal
⑪ ⑧
Pin
⑤ ②
Screw terminal
⑪ ⑧
Pin
Input equipment
(sensor etc.)
(＋)
（－）