Omron H3CR-AS - Page 51

H3CR
H3CR
53
Relationship between Input and Power Supply
Circuits (H3CR-Aj/-AjS)
An appropriate input is applied to the input signal terminals of the
H3CR-Aj/-AjS
when one of the input terminals is short-circuited
with the common terminal (terminal 2) for the input signals. Never
use
terminal 10 as the common terminal for this purpose, otherwise
the internal circuit of the T imer will be damaged.
H3CR-A
10
2
Input terminal
5, 6, 7
G, S, R
Incorrect
Input terminal
5, 6, 7
G, S, R
Correct
H3CR-A
10
2
Do not connect a relay or any other load between input terminals,
otherwise
the internal circuit of the T imer will be damaged due to the
high-tension voltage applied to the input terminals.
Input
contact
AC or DC
power supply
H3CR-A
10
2
Input terminal
5, 6, 7
G, S, R
Ry
Relationship between Input and Power Supply
Circuits (H3CR-AP)
Input circuit
Power supply
circuit
AC/DC
power
supply
H3CR-AP
Since the input circuit and the power supply circuit are configured
independently,
the input circuit can be turned ON or OFF irrespec -
tive
of the ON/OFF state of the power supply .
It must be noted that a voltage equivalent to the power supply volt -
age
is applied to the input circuit.
If a relay or transistor is connected to two or more T imers, the input
terminals of those T imers must be wired properly so that they will not
be different in phase or the terminals will be short-circuited to one
another
(refer to the figures below).
Incorrect
Contact or transistor for
external input signal
H3CR-AP
Power supply
H3CR-AP
Short-circuit current
10
6
7
2
10
6
7
2
Correct
Contact or transistor for
external input signal
Power supply
H3CR-AP
H3CR-AP
Short-circuit current
10
6
7
2
10
6
7
2
Common to All H3CR-A Models
With the H3CR-AP , input wires must be as short as possible. If the
floating capacity of wires exceeds 1,200 pF (approx. 10 m for cables
with 120 pF/m), the operation will be af fected. Pay particular atten -
tion
when using shielded cables.
The H3CR-AjS transistor output is isolated from the internal cir-
cuitry by a photocoupler. Therefore, either NPN or PNP output is
possible.