For Input Connection; For Output Connection - Panasonic KW8M User Manual

3.3 For input connection

◇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. 7mA.)
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.
(Note)
Operating power supply input part and measured voltage input are 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.
Operating power supply
Measured voltage input
Do not ground the secondary side.

3.4 For Output connection

Since the transistor output is insulated from the internal circuit by a photo-coupler, it can be used both
as a NPN output and PNP (equal value) output.
NPN output Pulse (+)
・Wire up to 100m for output connection.
If it is long, it may not work correctly due to floating capacitance of wire.
=6μA max
CBO
Operating power supply
Measured voltage input
(Fig.B) No Good example
Insulated
Input equipment
transformer
(sensor etc.)
(＋)
(－)
Eco-POWER
METER
Eco-POWER METER
Pulse (－)
6
7
Load
+ -
Power supply for Load
KW8M Eco-POWER METER (1A/5ACT input type)
(Fig.A)
Good example
Insulated
Input equipment
transformer
(sensor etc.)
(＋)
(－)
Eco-POWER
METER
Operating power supply
Measured voltage input
Auto transformer
Eco-POWER
METER
Do not use an auto-transformer.
PNP output Pulse (+)
9
⑤
⑤
Input equipment
(sensor etc.)
(＋)
(－)
Eco-POWER METER
Pulse (－)
6
7
Load
+ -
Power supply for Load
④
④