Omron H3DE Manual page 33

Switching Current vs. Ambient Temperature
(When Mounting Two or More H3DE Units
Side-by-Side)
70
60
50
40
30
20
0 1 2 3
■ Input/Output
Relationship between Input and Power
Supply Circuits
B1
AC/DC
power
Input circuit
supply
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.
If a relay or transistor is connected to two or more Timers, the input
terminals of those Timers must be wired properly so that they will not
be different in phase or the terminals will be short-circuited to one
another (refer to the figures below).
Mounting clearance:
50 mm
Mounting
clearance: 10 mm
Maximum range of
operating ambient
temperature
Mounting
clearance: 5 mm
Mounting
clearance: 0 mm
Load current (A)
4 5
A1
Power supply
circuit
A2
Contact or transistor for
external input signal
B1
Incorrect
Short-circuit
current
B1
Contact or transistor for
external input signal
B1
Correct
Short-circuit
current
B1
The H3DE Series is provided with a transformerless power supply
system.
■ Input Wires
The input wires must be as short as possible. If the floating capacity
of wires exceeds 2,000 pF (approx. 17 m for cables with 120 pF/m),
the operation will be affected. Pay particular attention when using
shielded cables.
■ Wiring (H3DE-H)
The H3DE has a high impedance circuit. Therefore, the H3DE may
not be reset if the H3DE is influenced by inductive voltage. In order to
eliminate any influence of inductive voltage, the wires connected to
the H3DE must be as short as possible and should not be installed
alongside power lines. If the H3DE is influenced by inductive voltage
that is 30% or more of the rated voltage, connect a CR filter with a
capacitance of approximately 0.1 F and a resistance of approxi-
mately 120 or a bleeder resistor between the power supply termi-
nals. If there is any residual voltage due to current leakage, connect
a bleeder resistor between the power supply terminals.
H3DE (Common)
Solid-state Timer
A1
H3DE
Power supply
A2
A1
H3DE
A2
A1
H3DE
Power supply
A2
A1
H3DE
A2
B-83