H3CA

H3CA

13

s CHECK INPUT

ON-Delay Operation

When a no-voltage input signal is applied to the timer during

the lapse of a set time, the remaining set time will become 0

and the timer will enter the next control state. Also, while the

Check Signal is applied, the elapsed time measurement of the

set time is not performed. The Check input is especially useful

where ON-delay override may be desirable.

t - a = less than set time

Reset

3 - 7

(X-B1)

Power

2 - 10

(A1-A2)

Start

3 - 6

(X-C1)

Control

9 - 11

output NO

(15-18)

Check

3 - 4

(X-E1)

Reset

3 - 7

(X-B1)

Power

2 - 10

(A1-A2)

Start

3 - 6

(X-C1)

Control

9 - 11

output NO

(15-18)

Check

3 - 4

(X-E1)

t + set time

t - a = less than set time

Repeat Cycle Operation

The Check input signal in Repeat cycle mode allows

the timer to be used like a binary flip-flop or alternating

relay. Set an unattainable time, such as 999 hours.

Apply the no-voltage Check input to shift output status

from ON to OFF, or vice-versa. Jumper terminals 3 and 6

(X and C1) to short the start function. The Check input

then controls the output relay like a flip-flop or alternating

relay. This may be used to alternate wear on main and

secondary equipment such as pumps.

t-a

Installation

s PROPER INPUT CONNECTIONS (H3CA-A, H3CA-FA)

The neutral or common of the power supply is connected

to terminal 2 (A2) of the timer. Terminal 10 (A1) should be

connected to the "hot" or positive of the power supply. Do

not apply voltage to Check, Gate, Start and Reset inputs.

These are no-voltage type inputs.

......

•

•

•

Power

supply

AC or DC

Input contact

Load

2 (A2)

10 (A1)

8

9

11

•

↓

↑

•

4, 5, 6, 7

C, G, S, R

H3CA-A

(H3CA-FA)

s PROPER OUTPUT CONNECTIONS

Design your control circuit using the output relay contacts to

switch the load. Never switch a load with the contact that

is being used as an input signal. The timer's circuitry may

be damaged.

s PARALLEL CONNECTIONS

Parallel connection of two or more Omron Timers is possible

as shown by the diagram to the right.

This will allow the simultaneous start or restart of multiple

timers using a single switch for the Start Input and a single

switch for the Reset Input.

It is possible to wire only up to 4 timers in this manner. Wiring

more than 4 results in poor performance due to excessive

voltage drop.

Reset

Start

Com

Com

H3CA-A

Timer

H3CA-A

Timer

10

11

9

1

2

3

4

5

6

7

8

10

11

9

1

2

3

4

5

6

7

8