KW8M Eco-POWER METER (1A/5ACT input type)
9
⑤
④
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
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. 7mA.)
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.
(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.
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.
・
Wire up to 100m for output connection.
If it is long, it may not work correctly due to floating capacitance of wire.
⑤
④
Eco-POWER
METER
(
＋
)
(
－
)
Insulated
transformer
Input equipment
(sensor etc.)
Operating power supply
Measured voltage input
(Fig.A)
Good example
Eco-POWER
METER
(
＋
)
(
－
)
Eco-POWER
METER
Auto transformer
(Fig.B) No Good example
Do not ground the secondary side.
Do not use an auto-transformer.
Operating power supply
Measured voltage input
Operating power supply
Measured voltage input
Insulated
transformer
Input equipment
(sensor etc.)
Input equipment
(sensor etc.)
(
＋
)
(
－
)
Load
Power supply for Load
-
+
NPN output
Eco-POWER METER
Pulse (
－
)
Pulse (+)
PNP output
-
+
Eco-POWER METER
Power supply for Load
Pulse (
－
)
Pulse (+)
6
Load
7
6
7
