P2CF-08 datasheet(21/22 Pages) OMRON

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Solid-state Multi-functional Timer

H3CR-A

B-129

Precautions (H3CR-A)

Note: The undermentioned is common for all H3CR-A models.

I Power Supplies

For the power supply of an input device of the H3CR-A

@/-A@S/-AP,

use an isolating transformer with the primary and secondary wind-

ings mutually isolated and the secondary winding not grounded.

Example: H3CR-A

The H3CR-A

@/-A@S/AP’s power supply terminal 2 is a common ter-

minal for input signals to the Timer. Do not disconnect the wires on

terminal 2, otherwise the internal circuitry of the Timer will be dam-

aged.

Make sure that the voltage is applied within the specified range, oth-

erwise the internal elements of the Timer may be damaged.

I 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-cir-

cuiting due to a sneak current to the transformerless power supply. If

a relay or transistor is connected to two or more Timers, the input ter-

minals 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.

It is impossible to provide two independent power switches as shown

below regardless of whether or not the Timers are different in phase.

5, 6, 7

H3CR-A

Power supply

Isolation transformer is required.

Input device

Input

terminal

5, 6, 7

G, S, R

H3CR-A

Input terminal

Power supply

H3CR-A

Power supply

Incorrect

Correct

Short-circuit current

Contact or transistor for

external input signal

Input

terminal

Input

terminal

Input

terminal

Input

terminal

Power supply

Input

terminal

Input

terminal

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