H3CR
H3CR
53
Precautions (H3CR-H)
Note: The undermentioned is common for all H3CR-H models.
Power Supplies
The H3CR-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.
With the H3CR-H
j
RL, for the power supply of an input device, use
an isolating transformer, of which the primary and secondary wind-
ings are mutually isolated and the secondary winding is not
grounded.
Input terminal
H3CR-H
j
RL
Power supply
Isolation transformer is required.
Input device
10
2
4*
7
1*
5
7*
2*
*
:H3CR-H8RL
Input/Output (H3CR-H
j
RL)
An appropriate input is applied to the input signal terminal of the Tim-
er when the input terminal for the input signal is short-circuited. Do
not attempt to connect any input terminal to any terminal other than
the input terminal or to apply voltage across other than the specified
input terminals or the internal circuits of the Timer may be damaged.
The H3CR-H
j
RL uses transformerless power supply. When con-
necting a relay or 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 input is made simultaneously from one input contact or a transistor
to the H3CR-H and a Timer whose common input terminals are
used as power terminals, such as the H3CR-A, a short-circuit cur-
rent will be generated. Either input through isolated contacts, or iso-
late the power supply for one of the Timers.
H3CR-H
j
RL
Short-circuit current
*: H3CR-H8RL
H3CR-A
10
7*
2
2*
10
2
R.
S.
7
6
G.
5
4*
5
1*
7
Wiring
The H3CR-H has a high impedance circuit. Therefore, the H3CR-H
may not be reset if the H3CR-H is influenced by inductive voltage. In
order to eliminate any influence of inductive voltage, the wires con-
nected to the H3CR-H must be as short as possible and should not
be installed alongside power lines. If the H3CR-H 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
µ
F and a resis-
tance of approximately 120
Ω
or a bleeder resistor between the
power supply terminals. If there is any residual voltage due to cur-
rent leakage, connect a bleeder resistor between the power supply
terminals.
Operation
An interval of 3 s minimum is required to turn on the H3CR-H after
the H3CR-H is turned off. If the H3CR-H is turned on and off repeat-
edly with an interval of shorter than 3 s, the internal parts of the
H3CR-H may deteriorate or the H3CR-H may malfunction.
Power
Output
state 1
3 s min.
Output
state 2
After the forced reset function of the H3CR-H is activated, an inter-
val of 3 s minimum is required to activate the forced reset function
again. If the forced reset function is activated repeatedly with an in-
terval of shorter than 3 s, the internal parts of the H3CR-H may dete-
riorate and the H3CR-H may malfunction.
Power
Reset
input
3 s min.
Output
3 s min.
If it is required that the output be turned on repeatedly with an inter-
val of shorter than 3 s, consider use of the H3CR-A in mode D (sig-
nal OFF-delay).
Others
If the H3CR-H is dropped or experiences some other kind of shock,
because a latching relay is used for output, contacts may be
reversed or go into a neutral state. If the H3CR-H is dropped, recon-
firm correct operation.
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