H3CA

15

Input/Output

The operation of the output contacts varies with the operation

specifications. Before making connections, check the operation

specifications and operating conditions using the application

examples provided.

The H3CA-A and H3CA-FA do not use transformers. Simultaneous

inputting power from two or more power supplies to separate timers

or counters from a single input contact or transistor is not possible.

For the power supply of an input device, use an isolating transformer,

of which the primary and secondary windings are mutually isolated

and the secondary winding is not grounded.

A transformer is not used in the power supplies for the H3CA-A and

H3CA-FA. You can therefore receive an electrical shock by touching

the input terminals when the power supply voltage is being applied.

Take adequate precautions to protect against electrical shock.

Inputs to input signal terminals are made by shorting the individual

input terminals to the common terminal (terminal 3 for the H3CA-A or

terminal (X) for the H3CA-FA). Internal circuits may be damaged if

connections are made to any other terminals or if voltages are

applied.

If contacts are used to short the terminals, they will be switching a

low voltage (approximately 5 VDC) and current (approximately

100

µA). You must therefore use high-reliability contacts with a

contact resistance of 1 k

Ω or less when shorted and residual voltage

of 1 V maximum when shorted.

The reset input will take priority if both the set and reset inputs are

turned ON simultaneously.

Others

Holding relays are used for outputs on the H3CA-A Series. Dropping

the Unit or otherwise subjecting it to shock can cause the relay to

reverse or to move to the center position.

How to Mount the Timer on Mounting

Track

When mounting a H3CA-FA Timer on a socket mounting track,

observe the following procedures:

Mounting

First hook portion A of the timer to an edge of the track and then

depress the timer in direction B.

Dismounting

Pull out portion C with a round-blade screwdriver and remove the

timer from the mounting track.

H3CA-A/-FA

Input

terminal

Power supply

Circuit

Isolation transformer is required.

B

A

C

In the interest of product improvement, specifications are subject to change without notice.

ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.

To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.