Panasonic KW4M, Руководство пользователя

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20
6-3-3 Pulse measurement
◇
Main unit wiring diagrams
＜
Pin type
＞ ＜
Screw terminal type
＞
◇
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
CEO
=20V min. I
C
=20mA min. I
CBO
=6
μ
A max
Use transistors with a residual voltage of less than 1.5V when the
transistor is ON.
※
Short-circuit impedance should be less than 1k
Ω
.
(When the impedance is 0
Ω
, drain current is approx. 5mA.)
The open-circuit impedance should be more than 100k
Ω
.
・
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.
Eco-POWER
METER
(＋)
（－）
Insulated
transformer
Input equipment
(sensor etc.)
AC power supply
(Fig.A)
Good example
Eco-POWER
METER
(＋)
（－）
Insulated
transformer
Input equipment
(sensor etc.)
Eco-POWER
METER
(＋)
（－）
Auto transformer
AC Power supply AC Power supply
(Fig.B) No Good example
Do not ground the secondary side.
Do not use an auto-transformer.
Input equipment
(sensor etc.)
Screw terminal
⑤ ②
Pin
⑪ ⑧
Screw terminal
⑤ ②
Pin
⑪ ⑧