Omron H3CR-A, Руководство пользователя

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H3CR H3CR
52
Precautions (H3CR-A)
Note: The undermentioned is common for all H3CR-A models.
Power Supplies
For the power supply of an input device of the H3CR-A
j
/-A
j
S/-AP,
use an isolating transformer with the primary and secondary wind-
ings mutually isolated and the secondary winding not grounded.
Example: H3CR-A
H3CR-A
Input
terminal
Power supply
Isolation transformer is required.
Input device
S, G, R
5, 6, 7
2
10
2
The H3CR-A
j
/-A
j
S/AP’s power supply terminal 2 is a common
terminal for input signals to the Timer. Do not disconnect the wires
on terminal 2, otherwise the internal circuitry of the Timer will be
damaged.
H3CR-A
Input terminal
5, 6, 7
G, S, R
10
2
Make sure that the voltage is applied within the specified range,
otherwise the internal elements of the Timer may be damaged.
Input/Output
Relationship between Input and Power Supply
Circuits (except for H3CR-A8E)
The H3CR-A (except for H3CR-A8E) uses transformerless power
supply. When connecting a relay or transistor as an external signal
input device, pay attention to the following points to prevent short-
circuiting due to a sneak current to the transformerless power sup-
ply. 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 differ in phase, otherwise the terminals will be short-circuited
to one another.
Input
terminal
Power supply
H3CR-A
Input
terminal
Contact or transistor for
external input signal
Input
terminal
Power supply
Input
terminal
Incorrect
Correct
Short-circuit current
It is impossible to provide two independent power switches as
shown below regardless of whether or not the Timers are different in
phase.
Input
terminal
Power supply
Input
terminal