Omron H3DE, Manual

B-82

Solid-state Timer 

H3DE (Common)

Precautions (Common)

Note:

The undermentioned is common for all H3DE models.

■

Changing of Setting

 !Caution

Do not change the time unit, time scale, operating mode, or output
type selector switch while the Timer is in operation or malfunction
could result.

■

Mounting and Dismounting

The H3DE should be mounted as horizontally as possible.

When mounting the H3DE on a socket mounting track, hook portion
(A) of the Timer to an edge of the track first, and then depress the
Timer in the direction of (B).

When dismounting the H3DE, pull out portion (C) with a flat-blade
screwdriver and remove the Timer from the mounting track.

The H3DE can be mounted and dismounted with ease if a distance
of 30 mm or more is kept between the H3DE and the top surface of
other equipment located below the H3DE.

■

Power Supplies

The H3DE Series is provided with a transformerless power supply
system. An electric shock may be received if the input terminal or the
output type selector switch is touched while power is being supplied.

Use the bar terminal for wiring the H3DE. Using a stranded-wire ter-
minal may cause a short-circuit due to a stray wire entering into the
Timer.

Both AC and DC power supplies can be connected to the power
input terminals without regarding polarity. 

With the H3DE only, a DC power supply must be connected to the
power input terminals as designated according to the polarity of the
terminals.

A DC power supply can be connected if its ripple factor is 20% or
less and the mean voltage is within the rated operating voltage range
of the Timer.

Connect the power supply voltage through a relay or switch in such a
way that the voltage reaches a fixed value at once or the Timer may
not be reset or a timer error could result.

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.

The H3DE-H has a large inrush current; provide sufficient power
supply capacity. If the power supply capacity is too small, there may
be delays in turning ON the output.

■

Installation

If the load current is continuously being supplied to the Timer for a
long period of time, be sure to provide the mounting clearance as
shown in the figure below. If used under the conditions other than
those specified below, the life of internal components may be short-
ened due to an excessive rise in the internal temperature.

(A)

(B)

(C)

30 mm min.

Rail stopper

B1

A1

A2

H3DE

Power supply

Circuit

Isolation transformer is required.

Rectifier circuit

Start 
input

t

t

DIN track

t: Mounting clearance (mm)

H3DE

H3DE

H3DE