Omron H3DS Series, Руководство пользователя

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B-48
Common to All Timers
H3DS
Precautions
■
Changing of Setting
!Caution
Do not change the time scale or operating mode, while the Timer
is in operation or malfunction could result.
■
Power Supplies
The H3DS Series is provided with a transformerless power supply
system. An electric shock may be received if the input terminal is
touched while power is being supplied.
Use the bar terminal for wiring the H3DS. 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 H3DS 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.
Make sure that the voltage is applied within the specified range, oth-
erwise the internal elements of the Timer may be damaged.
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.
Be sure that the capacity of the power supply is large enough, other-
wise the Timer may not start due to inrush current (approx. 3 A) that
may flow for an instant when the Timer is turned on.
For the power supply of an input device of the H3DS-ML @ , use an
isolating transformer, of which the primary and secondary windings
are mutually isolated and the secondary winding is not grounded.
■
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 (except for the H3DS-XL
@ ), the life of internal
components may be shortened due to an excessive rise in the inter-
nal temperature.
Switching Current vs. Ambient
Temperature
(When Mounting Two or More H3DS
Units Side-by-Side)
• H3DS-ML
@
/-SL
@
/-AL-
@
• H3DS-FL @ /-GL @
■
Input/Output
Relationship between Input and Power
Supply Circuits (H3DS-ML
@ )
Since the input circuit and the power supply circuit are configured
independently, the input circuit can be turned on or off irrespective of
the on/off state of the power supply.
It must be noted that a voltage equivalent to the power supply voltage
is applied to the input circuit.
When connecting a relay or a 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 supply.
A1
A2
B1
H3DS-ML @
Circuit
Power supply
Rectifier circuit
Isolation transformer is required.
Start
input
H3DS H3DS H3DS
t: Mounting clearance (mm)
DIN track
H3DS H3DS H3DS
t t
0
30
40
50
60
70
1 2 3 4 5
Load current (A)
Mounting clearance:
0 mm
Mounting clearance:
5 mm
Maximum range of
operating ambient
temperature
Ambient temperature (
°
C)
0
30
40
50
60
70
1 2 3 4 5
Load current (A)
Mounting clearance:
0 mm
Mounting clearance:
5 mm
Maximum range of
operating ambient
temperature
Ambient temperature (
°
C)
Mounting clearance:
10 mm
B1 A1
A2
AC/DC
power
supply
Input circuit
Power supply
circuit