Panasonic LT4H240ACJ Time Delay Relay, Timer, 1 voltage-free changeover contact 100 - 240 Vac IP66 LT4H240ACJ Data Sheet
Product codes
LT4H240ACJ
49
PRECAUTIONS DURING USAGE
1. Terminal wiring
1) When wiring the terminals, refer to the
terminal layout and wiring diagrams and
be sure to perform the wiring properly
without errors.
2) When using the instrument with an
embedded installation, the screw-down
terminal type is recommended. For the
pin type, use either the rear terminal
block (AT8-RR) or the 8P cap (AD8-RC)
for the 8-pin type, and the 11P cap (AT8-
DP11) for the 11-pin type. Avoid
soldering directly to the round pins on
the unit.
When using the instrument with a front
panel installation, use the DIN rail termi-
nal block (ATC18003) for the 8-pin type
and the DIN rail terminal block
(ATC18004) for the 11-pin type.
3) After turning the unit off, make sure
that any resulting induced voltage or
residual voltage is not applied to power
supply terminals W through U (8-pin
type) W through P (11-pin type) or
and
1) When wiring the terminals, refer to the
terminal layout and wiring diagrams and
be sure to perform the wiring properly
without errors.
2) When using the instrument with an
embedded installation, the screw-down
terminal type is recommended. For the
pin type, use either the rear terminal
block (AT8-RR) or the 8P cap (AD8-RC)
for the 8-pin type, and the 11P cap (AT8-
DP11) for the 11-pin type. Avoid
soldering directly to the round pins on
the unit.
When using the instrument with a front
panel installation, use the DIN rail termi-
nal block (ATC18003) for the 8-pin type
and the DIN rail terminal block
(ATC18004) for the 11-pin type.
3) After turning the unit off, make sure
that any resulting induced voltage or
residual voltage is not applied to power
supply terminals W through U (8-pin
type) W through P (11-pin type) or
and
(screw-down terminal type). (If
the power supply wire is wired parallel to
the high voltage wire or power wire, an
induced voltage may be generated
between the power supply terminals.)
4) Have the power supply voltage pass
through a switch or relay so that it is
applied at one time. If the power supply
is applied gradually, the counting may
malfunction regardless of the settings,
the power supply reset may not function,
or other such unpredictable occurrence
may result.
the high voltage wire or power wire, an
induced voltage may be generated
between the power supply terminals.)
4) Have the power supply voltage pass
through a switch or relay so that it is
applied at one time. If the power supply
is applied gradually, the counting may
malfunction regardless of the settings,
the power supply reset may not function,
or other such unpredictable occurrence
may result.
2. Input connections
The power circuit has no transformer.
When an input signal is fed to two or
more timers at once, do not arrange the
power circuit in an independent way.
If the timer is powered on and off inde-
pendently as shown in Fig. A, the timer's
internal circuitry may get damaged.Be
careful never to allow such circuitry.
(Figs. A, B and C show the circuitry for
the 11-pin type.)
The power circuit has no transformer.
When an input signal is fed to two or
more timers at once, do not arrange the
power circuit in an independent way.
If the timer is powered on and off inde-
pendently as shown in Fig. A, the timer's
internal circuitry may get damaged.Be
careful never to allow such circuitry.
(Figs. A, B and C show the circuitry for
the 11-pin type.)
2
1
If independent power circuitry must be
used, keep the input contacts or transis-
tors separate from each other, as shown
in Fig. B.
used, keep the input contacts or transis-
tors separate from each other, as shown
in Fig. B.
When power circuitry is not independent,
one input signal can be fed to two or more
counters at once, as shown in Fig. C.
one input signal can be fed to two or more
counters at once, as shown in Fig. C.
3. Input and output
1) Signal input type
(1) Contact point input
Use highly reliable metal plated contacts.
Since the contact point’s bounce time
leads directly to error in the timer opera-
tions, use contacts with as short a
bounce time as possible. Also, select a
minimum input signal width of 20 ms.
1) Signal input type
(1) Contact point input
Use highly reliable metal plated contacts.
Since the contact point’s bounce time
leads directly to error in the timer opera-
tions, use contacts with as short a
bounce time as possible. Also, select a
minimum input signal width of 20 ms.
(2) Non-contact point input
Connect with an open collector. Use
transistors whose characteristics satisfy
the criteria given below.
V
Connect with an open collector. Use
transistors whose characteristics satisfy
the criteria given below.
V
CEO
= 20 V min.
I
C
= 20 mA min.
I
CBO
= 6µA max.
Also, use transistors with a residual volt-
age of less than 2 V when the transistor
is on.
age of less than 2 V when the transistor
is on.
8 pin type
Screw terminal type
1
—
—
4
3
11 pin type
3
4
5
6
7
6
7
8
9
10
Reset input
Signal input
Stop input
Lock
input
input
Reset input
DC12 to 40V
Q
(The above example is for reset input)
8 pin type
Screw terminal type
1
—
—
4
3
11 pin type
3
4
5
6
7
6
7
8
9
10
Reset input
Signal input
Stop input
Lock
input
input
8 pin type
Screw terminal type
1
—
—
4
3
11 pin type
3
4
5
6
7
6
7
8
9
10
LT4H series CAUTIONS FOR USE
* The short-circuit impedance should be
less than 1 k
less than 1 k
Ω.
[When the impedance is 0 W, the current
coming from the input 1 and input 2 ter-
minals is approximately 12 mA, and from
the reset input and lock input terminals is
approximately 1.5 mA.]
coming from the input 1 and input 2 ter-
minals is approximately 12 mA, and from
the reset input and lock input terminals is
approximately 1.5 mA.]
Also, the open-circuit impedance should
be more than 100 k
be more than 100 k
Ω.
* As shown in the diagram below, from a
non-contact point circuit (proximity
switches, photoelectric switches, etc.)
with a power supply voltage of between
12 and 40 V, the signal can be input
without using an open collector transis-
tor. In the case of the diagram below,
when the non-contact point transistor Q
switches from off to on (when the signal
voltage goes from high to low), the sig-
nal is input.
switches, photoelectric switches, etc.)
with a power supply voltage of between
12 and 40 V, the signal can be input
without using an open collector transis-
tor. In the case of the diagram below,
when the non-contact point transistor Q
switches from off to on (when the signal
voltage goes from high to low), the sig-
nal is input.
2) The input mode and output mode
change depending on the DIP switch set-
tings. Therefore, before making any con-
nections, be sure to confirm the opera-
tion mode and operation conditions cur-
rently set.
3) For the power supply of the input
device, use a single-phase or double-
phase insulated power transformer. The
second-phase side must not be grounded.
change depending on the DIP switch set-
tings. Therefore, before making any con-
nections, be sure to confirm the opera-
tion mode and operation conditions cur-
rently set.
3) For the power supply of the input
device, use a single-phase or double-
phase insulated power transformer. The
second-phase side must not be grounded.
LT4H Timer
Input
terminals
Circuit
Rectifier circuits
Power
supply
supply
Insulated transformer
is necessary
is necessary
10
2
3
(Fig. A)
Input contact
point or transistor
point or transistor
2
3
10
Power
supply
supply
Input
terminal
terminal
terminal
Input
10
2
3
3
2
10
(Fig. B)
Input contact
point or transistor
point or transistor
Power
supply
supply
point or transistor
Input contact
terminal
Input
terminal
Input
(Fig. C)
Power
supply
supply
3
3
Input contact
point or transistor
point or transistor
10
2
10
2
terminal
Input
terminal
Input
02/2003