Relationship Between Input And Power Supply Circuits (H3Cr-A/-As); Relationship Between Input And Power Supply Circuits (H3Cr-Ap); Common To All H3Cr-A Models - Omron H3CR Manual

Relationship between Input and Power
Supply Circuits (H3CR-A@/-A@S)
An appropriate input is applied to the input signal terminals of the
H3CR-A@/-A@S 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 Timer will be damaged.
Incorrect
AC or DC
power supply
Correct
AC or DC
power supply
Do not connect a relay or any other load between input terminals,
otherwise the internal circuit of the Timer will be damaged due to the
high-tension voltage applied to the input terminals.
Ry
AC or DC
power supply
Input
contact
Relationship between Input and Power
Supply Circuits (H3CR-AP)
H3CR-AP
AC/DC
power
supply
Input circuit
Since the input circuit and the power supply circuit are configured
independently, the input circuit can be turned ON or OFF irrespective
of the ON/OFF state of the power supply.
It must be noted that a voltage equivalent to the power supply voltage
is applied to the input circuit.
10
H3CR-A
5, 6, 7
G, S, R
Input terminal
2
10
5, 6, 7
G, S, R
Input terminal
H3CR-A
2
10
H3CR-A
5, 6, 7
G, S, R
Input terminal
2
Power supply
circuit
If a relay or transistor is connected to two or more Timers, the input
terminals of those Timers 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
6
7
6
7
Correct Contact or transistor for
external input signal
6
H3CR-AP
7
6
H3CR-AP
7

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 affected. Pay particular atten-
tion when using shielded cables.
The H3CR-A@S transistor output is isolated from the internal cir-
cuitry by a photocoupler. Therefore, either NPN or PNP output is
possible.
Solid-state Multi-functional Timer
10
H3CR-AP
Power supply
2
10
Short-circuit current
H3CR-AP
2
10
Power supply
2
Short-circuit current
10
2
H3CR-A
23