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PRECAUTIONS IN USING THE PM4H SERIES
1. Input connections (PM4H-A type)
3) Terminal
-
(screw terminal x - c )
3) Connection of non-contact input (Pin
1) Be sure not to use terminal
as the
should be connected as the start input.
type example)
common terminal of the input signal as
Connect terminals
-
(screw terminal
(voltage input)
shown in Fig. A. Otherwise, the internal
x - v ) for reset signal input. Connect ter-
Fig. A
6 input)
circuit of the timer may be damaged.
Use terminal as the common terminal
as shown in Fig. B.
Contact input
(or non-contact
5 7
minals - (screw terminal x - b ) for
stop signal input. Be sure not to connect
with other terminals and apply excessive
voltage. The internal circuit will be dam-
aged.
4) The input wiring other than the power
Internal circuit
with photoelectric
sensor, etc.
Q
1mA
5
2
6
7
(The start input
is turned on.)
[Example of
start input]
No good
Operating
voltage
Fig. B
2
10
Contact input
supply circuit should avoid these condi-
tions, high-voltage wiring and parallel
wiring with power wire. Wire in short with
using the shielding wire or metal wiring
tube.
Even if the open collector is not used,
input is also possible from the non-con-
tact circuit of 6 to 30V DC. In this case,
the start input is turned on when the sig-
nal is turned from H to L.
Good
5
2
6
7
10
(or non-contact
input)
5) For start, reset and stop input, use
gold-plated contact with high reliability.
Since contact bouncing causes errors in
The residual voltage must be 0.6V or
less when Q is on. On the AC type, an
insulated transformer is required as the
Operating
voltage
If the circuits is connected as in Fig. C,
the start, use an input contact less
bounce time.
6) Keep the minimum signal input time
over 0.05 s.
power supply for the photoelectric sen-
sor, etc. (power supply for the input
devices).
Note: Keep the minimum input signal time of
the internal circuits must be broken. Be
sure to connect the circuit as in Fig. D.
2. Input signal conditions
each signal to 0.05s or more.
(PM4H-A type)
3. Checking the contacts before use
Fig. C
10
1) Connection of contact input (Pin type
(PM4H-F only)
No good
6
T
2
example
5
6
7
When the power ON time is less than the
minimum power application time, the
contacts may remain in an ON state, so
the state of the contacts should be
checked before use. When the contacts
Fig. D
10
2
are in an ON state, activating them once
will return them to their normal state (the
Good
6
T
2
Use gold-plated contacts with high-relia-
bility. The bounce time at the contacts
OFF state after time-out). (Be aware that
relay characteristics may result in the
causes errors in the timer operation time.
Accordingly, use start input contact
whose bounce time is short. The resis-
contacts being in that same ON state if
exposed to excessive vibration and
impact during transport.)
2) When one input signal is simultane-
tance when shorted should be less than
ously applied to more than one timer, be
sure to avoid the wiring shown in Fig. E.
Otherwise, the short-circuit current will
flow and cause damage. Be sure to align
the polarity of the power supply as
shown in Fig. F.
Fig. E
Input
1k ? , and when open resistance should
be more than 100k ? .
For the screw terminal type, connect the
terminal x to the each input signal.
2) Connection of non-contact input (Pin
type example)
(open-collector)
4. Time setting
To set the time, turn the set dial to a
desired time within the range.
Instantaneous output will be on when the
dial is set to “0”.
When the instantaneous output is used,
the dial should be set under “0” range.
(Instantaneous output area)
Note) When power supply is on, the time
No good
2
2
terminal
10
Input
terminal
10
Power
supply
5
2
6
7
range, setting time and operation mode
cannot be changed.
Turn off the power supply or a reset sig-
nal is applied to set the new operation
mode.
Fig. F
Contact or
non-contact input
Input
Apply the open-collector connection. The
characteristics of the transistor used
If the position is not stable, the timer
might mis-operate.
Good
2
2
terminal
10
Input
terminal
10
Power
supply
must be V CEO =10V or more, I C =10mA or
more, and I CBO =6μA or less. Additionally,
the input impedance must be 1k ? or
less, and the residual voltage must be
0.6V or less.
For the screw terminal type, connect the
terminal x to the each input signal.
32
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