Panasonic LT4H/-L User manual

Features
1. Bright and Easy-to-Read Display
A brand new bright 2-color back light
LCD display. The easy-to-read screen in
any location makes checking and setting
procedures a cinch.
2. Simple Operation
Seesaw buttons make operating the unit
even easier than before.
3. Short Body of only 64.5 mm 2.539
inch (screw terminal type) or 70.1 mm
2.760 inch (pin type)
With a short body, it is easy to install in
even narrow control panels.
4. Conforms to IP66’s Weather
Resistant Standards
The water-proof panel keeps out water
and dirt for reliable operation even in
poor environments.
5. Screw terminal (M3.5) and Pin
Types are Both Standard Options
The two terminal types are standard
options to support either front panel
installation or embedded installation.
6. Changeable Panel Cover
Also offers a black panel cover to meet
your design considerations.
7. Compliant with UL, c-UL and CE.
48
1.890
48
1.890
64.5
2.539
Pin type Screw terminal type
Time range Operating mode Output Operating voltage Power down insurance Terminal type Part number
9.999 s (0.001 s~)
99.99 s (0.01 s~)
999.9 s (0.1 s~)
9999 s (1 s~)
99 min 59 s (1 s~)
999.9 min (0.1 min~)
99 h 59 min (1 min~)
999.9 h (0.1 h~)
Power ON delay (1)
Power ON delay (2)
Signal ON delay
Signal OFF delay
Pulse One-shot
Pulse ON-delay
Signal Flicker
Totalizing ON-delay
(8 modes)
Relay
(1 c)
Transistor
(1 a)
100 to 240 V AC
24 V AC
100 to 240 V AC
24 V AC
12 to 24 V DC
12 to 24 V DC
Available
11 pins
Screw terminal
11 pins
Screw terminal
11 pins
Screw terminal
11 pins
Screw terminal
LT4H-AC240V
8 pins LT4H8-AC240V
LT4H-AC240VS
LT4H-AC24V
8 pins LT4H8-AC24V
LT4H-AC24VS
LT4HT-AC240V
8 pins LT4HT8-AC240V
LT4HT-AC240VS
LT4HT-AC24V
8 pins LT4HT8-AC24V
LT4HT-AC24VS
11 pins
Screw terminal
11 pins
Screw terminal
LT4H-DC24V
8 pins LT4H8-DC24V
LT4H-DC24VS
LT4HT-DC24V
8 pins LT4HT8-DC24V
LT4HT-DC24VS
Product types
UL File No.: E122222
C-UL File No.: E122222
LT4H Timers
mm inch
* A rubber gasket (ATC18002) and a mounting frame (AT8-DA4) are included.
DIN 48 SIZE
DIGITAL TIMER LT4H/-L
Timers
RoHS Directive compatibility information
http://www.nais-e.com/
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

Part names
DOWN
UP
LOCK
RESET
smh
LOCK
RST
OP.
LT4H
TIMER
Time delay indicator
Elapsed time display
Set time display
Time units display
Up keys
Down keys
Controlled output indicator
Reset indicator
Lock indicator
Reset switch
Lock switch
(Countdown time display)
ON
87654321
DIP switches
(Same for screw terminal type and 8-pin type)
LT4H/-L
Features
1. Economically priced in anticipation
of market needs.
• Economically priced to provide
excellent cost performance.
2. Display is a bright reflective-type
LCD.
3. Inherits all of the characteristics of
the LT4H digital timer.
• Seesaw switches ensure easy
operation.
• IP66 environmental protection.
• Shortened body (70.1 mm 2.760 inch
underhead).
4. Compliant with UL, c-UL and CE.
48
1.890
48
1.890
64.5
2.539
UL File No.: E122222
C-UL File No.: E122222
LT4H-L Timers
mm inch
Product types
Time rangeProduct name Operating mode Output Operating voltage Power down
insurance Terminal type Part number
9.999 s (0.001 s~)
99.99 s (0.01 s~)
999.9 s (0.1 s~)
9999 s (1 s~)
99 min 59 s (1 s~)
999.9 min (0.1 min~)
99 h 59 min (1 min~)
999.9 h (0.1 h~)
LT4H-L
digital timer
Power ON delay (1)
Power ON delay (2)
Signal ON delay
Signal OFF delay
Pulse One-shot
Pulse ON-delay
Signal Flicker
Totalizing ON-delay
(8 modes)
Relay
(1 c)
Transistor
(1 a)
100 to 240 V AC
24 V AC/DC
100 to 240 V AC
24 V AC/DC
12 to 24 V DC
12 to 24 V DC
Available 8 pins
LT4HL8-AC240V
LT4HL8-AC24V
LT4HLT8-AC240V
LT4HLT8-AC24V
LT4HL8-DC24V
LT4HLT8-DC24V
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

Type
Item
Ralay output type
AC type AC/DC type
100 to 240 V AC, 24 V AC,
24 V AC/DC
50/60 Hz common
Max. 10 V A
5 A, 250 V AC (resistive load)
9.999 s, 99.99 s, 999.9 s, 9999 s, 99 min 59 s, 999.9 min, 99 h 59 min, 999.9 h (selected by DIP switch)
Addition (UP)/Subtraction (DOWN)
(2 directions selectable by DIP switch)
A (Power ON delay 1), A2 (Power ON delay 2), B (Signal ON delay), C (Signal OFF delay), D (Pulse one-shot),
E (Pulse ON delay), F (Signal Flicker), G (Totalizing ON delay) (selectable by DIP switch)
Min. input signal width: 1 ms, 20 ms (2 directions by selected by DIP switch) (The 8-pin type does not have a stop input.)
Min. input signal width: 20 ms (The 8-pin type does not have a lock input.)
Open collector input Input impedance: Max. 1 kΩ; Residual voltage: Max. 2 V
Open impedance: 100kΩor less, Max. energized voltage: 40V DC
7-segment LCD (LT4H, LT4H-L common), Elapsed value (backlight red LED), Setting value (backlight yellow LED)
EEP-ROM (Min. 105overwriting)
±(0.005 % + 50 ms) in case of power on start
±(0.005 % + 20 ms) in case of input signal start
Operating voltage: 85 to 110%
Temperature: –10 to +55°C +14 to +131°F
Min. input signal width: 1ms
Timed-out 1 Form C
100 mΩ(at 1 A 6 V DC)
Ag alloy/Au flash
Min. 2 ×107ope. (Except for switch operation parts)
1.0 ×105ope. (At rated control voltage)
85 to 110 % of rated operating voltage
2,000 Vrms for 1 min: Between live and dead metal parts (Pin type)
2,000 Vrms for 1 min: Between input and output
2,000 Vrms for 1 min: Between live and dead metal parts (11-pin)
2,000 Vrms for 1 min: Between input and output
1,000 Vrms for 1 min: Between contacts
Between live and dead metal parts
Min. 100 MΩ:Between input and output (At 500V DC)
Between contacts
Min. 100 MΩ:Between live and dead metal parts
Between input and output (At 500V DC)
Max. 0.5 s
10 to 55 Hz: 1 cycle/min single amplitude of 0.35 mm .014 inch (10 min on 3 axes)
10 to 55 Hz: 1 cycle/min single amplitude of 0.75 mm .030 inch (1 h on 3 axes)
Timed-out 1 Form A (Open collector)
—
—
—
Min. 107ope. (At rated control voltage)
12 to 24 V DC
—
Max. 3 W
100 to 240 V AC, 24 V AC,
24 V AC/DC
50/60 Hz common
Max. 10 V A
100 mA, 30 V DC
12 to 24 V DC
—
Max. 3 W
DC type
Transistor output type
AC type AC/DC type DC type
Rating
Time
accuracy
(max.)
Contact
Life
Electrical
Mechanical
Operating
conditions
Rated operating voltage
Rated frequency
Rated power consumption
Rated control capacity
Time range
Time counting direction
Operation mode
Start/Reset/Stop input
Lock input
Input signal
Indication
Power failure memory
method
Operating time fluctuation
Temperature error
Voltage error
Setting error
Contact arrangement
Contact resistance (Initial value)
Contact material
Mechanical (contact)
Electrical (contact)
Allowable operating voltage range
Breakdown voltage
(Initial value)
Insulation resistance
(Initial value)
Operating voltage reset
time
Max. 65° C
(under the flow of nominal operating current at nominal voltage)
—Temperature rise
Functional
Destructive
Vibration
resistance
Min. 98 m 321.522 ft./s2(4 times on 3 axes)
Min. 294 m 964.567 ft./s2(5 times on 3 axes)
–10° C to 55° C +14° F to +131° F
Max. 85 % RH (non-condensing)
860 to 1,060 h Pa
—
8-pin/11-pin/screw terminal
IP66 (front panel with rubber gasket)
20 % or less — 20 % or less
Functional
Destructive
Ambient temperature
Ambient humidity
Air pressure
Ripple rate
Connection
Protective construction
Shock
resistance
Specifications
[]
LT4H/-L
Applicable standard
Safety standard EN61812-1 Pollution Degree 2/Overvoltage Category II
EMC
(EMI)EN61000-6-4
Radiation interference electric field strength
Noise terminal voltage
(EMS)EN61000-6-2
Static discharge immunity
RF electromagnetic field immunity
EFT/B immunity
Surge immunity
Conductivity noise immunity
Power frequency magnetic field immunity
Voltage dip/Instantaneous stop/Voltage fluctuation immunity
EN55011 Group1 ClassA
EN55011 Group1 ClassA
EN61000-4-2 4 kV contact
8 kV air
EN61000-4-3 10 V/m AM modulation (80 MHz to 1 GHz)
10 V/m pulse modulation (895 MHz to 905 MHz)
EN61000-4-4 2 kV (power supply line)
1 kV (signal line)
EN61000-4-5 1 kV (power line)
EN61000-4-6 10 V/m AM modulation (0.15 MHz to 80 MHz)
EN61000-4-8 30 A/m (50 Hz)
EN61000-4-11 10 ms, 30% (rated voltage)
100 ms, 60% (rated voltage)
1,000 ms, 60% (rated voltage)
5,000 ms, 95% (rated voltage)
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

Dimensions
• LT4H digital timer
(units: mm inch)
Tolerance: ±1.0 ±.039
Terminal layouts and Wiring diagrams
• 8-pin type
Relay output type Transistor output type
Relay output type Transistor output type
• Screw terminal type
• Dimensions for embedded installation (with adapter installed)
•
Dimensions for front panel installations • Installation panel cut-out dimensions
The standard panel cut-out dimensions are shown
below. Use the mounting frame (AT8-DA4) and rub-
ber gasket (ATC18002).
• For connected installations
Note) 1: The installation panel thickness should be between 1
and 5 mm .039 and .197 inch.
Note) 2: For connected installations, the waterproofing ability
between the unit and installation panel is lost.
LT4H
TIMER
RESET
LOCK
UP
hms
OP.
RST
LOCK
DOWN
48
1.890
5.5
.217 55.6 2.189 14.5 .571
7.5
.295
44.5
1.752
7.5
.295
5.5
.217 64.5
2.539
44.5
1.752
Screw terminal type
(Flush mount)
Screw terminal type Pin type
Pin type
(Flush mount/Surface mount)
LT4H
TIMER
RESET
LOCK
UP
DOWN
OP.
RST
LOCK hms
Mounting frame
for flush mount
AT8-DA4 (supplied)
1
.039
44.5
1.752
Rubber gasket
ATC18002 (supplied)
Panel
63.5
2.500
48
1.890
66
2.598
50
1.969
48
1.890
LT4H
TIMER
UP
OP.
RST
LOCK
DOWN
LOCK
RESET
smh
Mounting frame
for flush mount
AT8-DA4 (supplied)
Panel
Rubber gasket
ATC18002 (supplied)
1
.039
11-pin type
(11p cap AT8-DP11
sold separately)
8-pin type
(8p cap AD8-RC
sold separately)
48
1.890 90 3.543
48
1.890 66 2.598
50
1.969
DIN rail terminal block
(8-pin type AT8-DF8K
sold separately)
(11-pin type AT8-DF11K
sold separately)
Device installation rail
AT8-DLA1
(sold separately)
95.5
(90.0)
3.760
(3.543) ( ) dimension is for 8-pin type.
80 min.
3.150
80 min.
3.150
45+0.6
01.772+.024 0
45+0.6
0
1.772+.024
0
A
A = (48 ×n – 2.5) +0.6
0
45+0.6
0
1.772+.024
0
8
5
17
6
2
34
Operating
voltage
–+
N.O.
N.C.
Start
Reset
Operating
voltage
–+
8
5
17
6
2
34
Start
Reset
• 11-pin type
Relay output type Transistor output type
Operating
voltage
–+
N.O.
N.C.
3
5
4
211110
9
8
7
6
Reset
Lock
Start
Stop
Operating
voltage
–+
3
5
4
211110
9
8
7
6
Reset
Lock
Start
Stop
Operating
voltage
+–
54321
109876
N.O.
N.C.
Reset
Lock
Start
Stop
Operating
voltage
+–
54321
109876
Reset
Lock
Start
Stop
LT4H/-L
Note) For connecting the output leads of the transistor output type, refer to
5) Transistor output on page 48.
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

Setting the operation mode, time range, and time
Setting procedure 1) Setting the operation mode and time range
Set the operation mode and time range with the DIP switches on the side of the LT4H timer.
DIP switches
Setting procedure 2) Setting the time
Set the set time with the keys (UP and DOWN keys) on the front of the LT4H timer.
DIP switch
Item DIP switch No.
123
ON ON ON A: Power on delay 1
OFF OFF OFF A2: Power on delay 2
ON OFF OFF B: Signal on delay
OFF ON OFF C: Signal off delay
ON ON OFF D: Pulse One shot
OFF OFF ON E: Pulse On delay
ON OFF ON F: Signal Flicker
OFF ON ON G: Totalizing On delay
Table 1: Setting the operation mode
Table 2: Setting the time range
Operation mode
Operation mode Refer to table 1
1
2
3
Minimum input reset, start, and
stop signal width 20 ms 1 ms
*4
Time delay direction Addition
Subtraction 5
Time range Refer to table 2
6
7
8
ONOFF
DIP switch No.
678
ON ON ON 0.001 s to 9.999 s
OFF OFF OFF 0.01 s to 99.99 s
ON OFF OFF 0.1 s to 999.9 s
OFF ON OFF 1 s to 9999 s
ON ON OFF 0 min 01 s to 99 min 59 s
OFF OFF ON 0.1 min to 999.9 min
ON OFF ON 0 h 01 min to 99 h 59 min
OFF ON ON 0.1 h to 999.9 h
Time range
Notes: 1) Set the DIP switches before installing the timer.
2) When the DIP SW setting is changed, turn off the power once.
3) The DIP switches are set as ON before shipping.
ON
12345678
DIP switches
(Same for screw terminal type)
QElapsed time display
WSet time display
ETime delay indicator
RControlled output indicator
TReset indicator
YLock indicator
UTime units display
IUP keys
Changes the corresponding digit of the
set time in the addition direction
(upwards)
ODOWN keys
Changes the corresponding digit of the
set time in the subtraction direction
(downwards)
PRESET switch
Resets the elapsed time and the output
{LOCK switch
Locks the operation of all keys on the unit
9
8
7
2
3
4
5
6
11
10
DOWN
UP
LOCK
RESET
sm
1
h
LOCK
RST
OP.
TIMER
LT4H
• Changing the set time
1. It is possible to change the set time
with the up and down keys even dur-
ing time delay with the timer.
However, be aware of the following
points.
1) If the set time is changed to less than
the elapsed time with the time delay set
to the addition direction, time delay will
continue until the elapsed time reaches
full scale, returns to zero, and then
reaches the new set time. If the set time
is changed to a time above the elapsed
time, the time delay will continue until the
elapsed time reaches the new set time.
2) If the time delay is set to the subtrac-
tion direction, time delay will continue
until “0” regardless of the new set time.
2. If the set time is changed to “0,” the
unit will operate differently depending
on the operation mode.
1) If the operation mode is set to A
(power on delay 1) or A2 (power on
delay 2), the output will turn on when the
power supply is turned on. However, the
output will be off while reset is being
input.
2) In the other modes, the output turns
on when the start is input. When the
operation mode is C (signal off delay), D
(Pulse one shot), or F (Signal flicker),
only when the start input is on does the
output turn on. Also, when the reset is
being input, the output is off.
Front display section
* The 8-pin type does not have the stop input, so that the dip
switch can be changed over between reset and start inputs.
The signal range of the lock input is fixed (minimum 20 ms).
LT4H/-L
• Power failure memory
The EEPROM is used for power failure memory. It has a life of Min. 105over-writings.
The EEPROM is overwriting with the following timing.
* Be aware that the contents of EEPROM for all modes will be overwritten when power is turned OFF during input to external lock terminals Rto Eand to .
Such an action does not exist by doing lock operation from the front.
67
Output mode Overwrite timing
Power ON delay (2) A2 When power is OFF
Addition G Change of preset value or start, reset input
When power is OFF after being ON
Other modes When power is OFF after changing preset value
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

Operation mode T: Set time t1, t2, t3, ta<T
Operation type
Power on delay (1)
Explanation Time chart
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Clears elapsed time value and starts time
delay at power ON.
• After timer completion, stops at the display of
the set value (addition), or stops at “0” (sub-
traction).
• Ignores start input.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
A
Power on delay (2)
A2
Signal on delay
B
Signal off delay
C
Stop
Reset
Output
Power supply
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Tt1
t2 t1+t2=T
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Tt1t2
t1+t2=T
Stop
Reset
Output
Power supply
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Tt1 t2 t1+t2=T
Stop
Start
Reset
Output
Power supply
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Tta tb t
T>ta+tb T>t
Stop
Start
Reset
Output
Power supply
123
ON ON ON
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Elapsed time value does not clear at power
ON. (power outage countermeasure func-
tion)
• The output remains ON even after the power
is cut and restarted.
• After timer completion, stops at the display of
the set value (addition), or stops at “0” (sub-
traction).
• Ignores start input.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
123
OFF OFF OFF
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Clears elapsed time value at power ON.
• Time delay starts at start ON and elapsed
time value or output resets at start OFF.
• Instantaneous time delay start at reset OFF
and power ON while start is ON.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
• In order to have the time delay start at power
ON or reset at power OFF, short out the start
input beforehand.
123
ON OFF OFF
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Clears elapsed time value at power ON.
• Output control ON at start ON and time delay
start at start OFF.
• Elapsed time value clears when start goes ON
again during time delay.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
123
OFF ON OFF
LT4H/-L
Notes: 1) Each signal input (start, reset, stop, and lock) is applied by shorting their input terminal to the common terminal (terminal Qfor the 8-pin type, terminal Efor
the 11-pin type, and terminal for the screw terminal type).
2) The 8-pin type does not have a stop input or lock input.
6
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

Operation type
Pulse One-shot
Explanation Time chart
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Clears elapsed time value at power ON.
• Time delay starts and output control ON at
start ON.
• Turns output control OFF and clears elapsed
time value at time-up.
• Ignores start input during time delay.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
• In order to have the time delay start at power
ON or reset at power OFF, short out the start
input beforehand.
D
Pulse On delay
E
Signal Flicker
F
Totalizing On delay
G
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
T T t1 t2
ta
T=t1+t2
T>ta
t
Stop
Start
Reset
Output
Power supply
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Tt2
T=t1+t2
T Tt1
Stop
Start
Reset
Output
Power supply
T>ta
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
t1 t1
T=t1+t2 T=t1+t2
tat2 t2 T
T T
Stop
Start
Reset
Output
Power supply
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Tt1 t2 t3 ta
T=t1+t2+t3 T>ta
Stop
Start
Reset
Output
Power supply
123
ON ON OFF
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Clears elapsed time value at power ON.
• Time delay starts at start ON.
• Ignores start input during time delay.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
• In order to have the time delay start at power
ON or reset at power OFF, short out the start
input beforehand.
123
OFF OFF ON
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Clears elapsed time value at power ON.
• Time delay starts at start ON.
• Ignores start input during time delay.
• Output control reverses, elapsed time value
clears, and timer delay starts at timer comple-
tion.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
• In order to have the time delay start at power
ON or reset at power OFF, short out the start
input beforehand.
123
ON OFF ON
• Set the operation mode
section of the DIP switches
(no.’s 1, 2, and 3) on the
side of the timer as shown.
• Elapsed time value does not clear at power
ON. (power outage countermeasure function)
• The output remains ON even after the power
is off and restarted.
• Stops delay time operation at stop ON.
Restarts delay time operation at stop OFF.
123
OFF ON ON
LT4H/-L
Notes: 1) Each signal input (start, reset, stop, and lock) is applied by shorting their input terminal to the common terminal (terminal Qfor the 8-pin type, terminal Efor
the 11-pin type, and terminal for the screw terminal type).
2) The 8-pin type does not have a stop input or lock input.
6
T: Set time t1, t2, t3, ta<T
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

Product types
Features
1. Wide time range
The operation time range covers from
0.01 sec. to 9999 hours.
The individual setting can be performed
on each of 1 and 2 timers.
99.99s 99min59s 99h59min
999.9s 999.9min 999.9h
9999s 9999h
2. Bright and Easy-to-Read Display
A brand new bright 2-color back light
LCD display. The easy-to-read screen in
any location makes checking and setting
procedures a cinch.
3. Simple Operation
Seesaw buttons make operating the unit
even easier than before.
4. Short Body of only 64.5 mm 2.539
inch (screw terminal type) or 70.1 mm
2.760 inch (pin type)
With a short body, it is easy to install in
even narrow control panels.
5. Conforms to IP66’s Weather
Resistant Standards
The water-proof panel keeps out water
and dirt for reliable operation even in
poor environments.
6. Screw terminal (M3.5) and Pin
Types are Both Standard Options
The two terminal types are standard
options to support either front panel
installation or embedded installation.
7. Changeable Panel Cover
Also offers a black panel cover to meet
your design considerations.
8. Compliant with UL, c-UL and CE.
9. Low Price
All this at an affordable price to provide
you with unmatched cost performance.
48
1.890
48
1.890
64.5
2.539
8-pin type 11-pin type Screw terminal
type
Time range Operating mode Output Operating voltage Power down insurance Terminal type Part number
99.99s
999.9s
9999s
99min59s
999.9min
99h59min
999.9h
9999h
Pulse input:
• Delayed one shot
• OFF-start flicker
• ON-start flicker
Integrating input:
• Delayed one shot
• OFF-start flicker
• ON-start flicker
Relay
(1 c)
100 to 240 V AC
Available
8 pins LT4HW8-AC240V
11 pins LT4HW-AC240V
Screw terminal LT4HW-AC240VS
24 V AC
8 pins LT4HW8-AC24V
11 pins LT4HW-AC24V
Screw terminal LT4HW-AC24VS
12 to 24 V DC
8 pins LT4HW8-DC24V
11 pins LT4HW-DC24V
Screw terminal LT4HW-DC24VS
Transistor
(1 a)
100 to 240 V AC
8 pins LT4HWT8-AC240V
11 pins LT4HWT-AC240V
Screw terminal LT4HWT-AC240VS
24 V AC
8 pins LT4HWT8-AC24V
11 pins LT4HWT-AC24V
Screw terminal LT4HWT-AC24VS
12 to 24 V DC
8 pins LT4HWT8-DC24V
11 pins LT4HWT-DC24V
Screw terminal LT4HWT-DC24VS
UL File No.: E122222
C-UL File No.: E122222
mm inch
LT4H-W
* A rubber gasket (ATC18002) and a mounting frame (AT8-DA4) are included.
DIN 48 SIZE
DIGITAL TIMER LT4H-W
Timers
RoHS Directive compatibility information
http://www.nais-e.com/
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

Part names
Specifications
Type
Item
Ralay output type
AC type
100 to 240 V AC, 24 V AC
50/60 Hz common
Max. 10 V A
5 A, 250 V AC
99.99s, 999.9s, 9999s, 99min59s, 999.9min, 99h59min, 999.9h, 9999h (selected by DIP switch)
Addition (UP)/Subtraction (DOWN)
(2 directions selectable by DIP switch)
Pulse input: Delayed one shot, OFF-start flicker or ON-start flicker
Integrating input: Delayed one shot, OFF-start flicker or ON-start flicker
Min. input signal width: 1 ms, 20 ms (2 directions by selected by DIP switch) (The 8 pin type does not have a stop input.)
Min. input signal width: 20 ms (The 8-pin type does not have a lock input.)
Open collector input Input impedance: Max. 1 kΩ; Residual voltage: Max. 2V
Open impedance: 100 kΩor less, Max. energized voltage: 40 V DC
7-segment LCD, Elapsed value (backlight red LED), Setting value (backlight yellow LED)
EEP-ROM (Min. 105overwriting)
±(0.005% + 50 ms) in case of power on start
±(0.005% + 20 ms) in case of input signal start
Timed-out 1 Form C
100 mΩ(at 1 A 6 V DC)
Ag alloy/Au flash
Min. 2 ×107ope. (Except for switch operation parts)
Min. 105ope. (At rated control voltage)
85 to 110 % of rated operating voltage
2,000 Vrms for 1 min: Between live and dead metal parts (Pin type only)
2,000 Vrms for 1 min: Between input and output
2,000 Vrms for 1 min: Between live and dead metal parts (11-pin type only)
2,000 Vrms for 1 min: Between input and output
1,000 Vrms for 1 min: Between contacts
Between live and dead metal parts
Min. 100 MΩ:Between input and output (At 500V DC)
Between contacts
Min. 100 MΩ:Between live and dead metal parts
Between input and output (At 500V DC)
Max. 0.5 s
10 to 55 Hz: 1 cycle/ min single amplitude of 0.35 mm .014 inch (10 min on 3 axes)
10 to 55 Hz: 1 cycle/ min single amplitude of 0.75 mm .030 inch (1 h on 3 axes)
Timed-out 1 Form A (Open collector)
—
—
—
Min. 107ope. (At rated control voltage)
12 to 24 V DC
—
Max. 3 W
100 to 240V AC, 24V AC
50/60 Hz common
Max. 10 V A
100 mA, 30 V DC
12 to 24 V DC
—
Max. 3 W
DC type
Transistor output type
AC type DC type
Rating
Time
accuracy
(max.)
Contact
Life
Electrical
Mechanical
Operating
conditions
Rated operating voltage
Rated frequency
Rated power consumption
Rated control capacity
Time range
Time counting direction
Operation mode
Start/Reset/Stop input
Lock input
Input signal
Indication
Power failure memory
method
Operating time fluctuation
Temperature error
Voltage error
Setting error
Contact arrangement
Contact resistance (Initial value)
Contact material
Mechanical (contact)
Electrical (contact)
Allowable operating voltage range
Breakdown voltage
(Initial value)
Insulation resistance
(Initial value)
Operating voltage reset
time
Max 65° C
(under the flow of nominal operating current at nominal voltage)
—
Temperature rise
Functional
Destructive
Vibration
resistance
Min. 98 m 321.522 ft./s2(4 times on 3 axes)
Min. 294 m 964.567 ft./s2(5 times on 3 axes)
–10° C to 55° C +14° F to +131° F
Max. 85 % RH (non-condensing)
860 to 1,060 h Pa
—
8-pin/11-pin/screw terminal
IP66 (front panel with rubber gasket)
20 % or less — 20 % or less
Functional
Destructive
Ambient temperature
Ambient humidity
Air pressure
Ripple rate
Connection
Protective construction
Shock
resistance
T2
T1
T2
DOWN
T1
UP
SET/LOCK
RESET
smh
LOCK
OP.
TIMER
LT4H-W
Fourth digit First digit
Controlled output indicator
Lock indicator
Reset switch
Set/Lock switch
T1/T2 Operation display
Display for change-over
Set time display
Time units display
Up keys
Down keys
(Subtraction elapsed
time display)
Elapsed time display
between T1/T2 settings
(Same for 8-pin and screw terminal type)
1
DIP switches
2345678
ON
LT4H-W
Operating voltage: 85% to 110%
Temperature: –10°C to +55°C +14°F to +131°F
Min. input signal width: 1ms
[]
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

Dimensions
• LT4H-W digital timer
(units: mm inch)
Tolerance: ±1.0 ±.039
• Dimensions for flush mount (with adapter installed)
• Dimensions for front panel installations • Installation panel cut-out dimensions
The standard panel cut-out dimensions are shown
below. Use the mounting frame (AT8-DA4) and rub-
ber gasket (ATC18002).
• For connected installations
Note) 1: The installation panel thickness should be between 1
and 5 mm .039 and .197 inch.
Note) 2: For connected installations, the waterproofing ability
between the unit and installation panel is lost.
LT4H-W
SET/LOCK
DOWN
T2
T1
LOCK
TIMER
RESET
T2
OP.
T1
m
UP
hs
48
1.890
44.5
1.752 44.5
1.752
7.5
.295
5.5 55.6 14.5
.217 2.189 .571
(Same for 8-pin type)
5.5 64.5
.217 2.539
7.5
.295
Screw terminal type
(Flush mount)
Screw terminal type Pin type
Pin type
(Flush mount/Surface mount)
UP
DOWN
SET/LOCK
RESET
TIMER
LOCK
T2
OP.
T1
T2
T1
mh s
LT4H-W
SET/LOCK
RESET
TIMER
T2
T2
LOCK
T1
OP.
T1
DOWN
UP
LT4H-W
mhs
Panel
Rubber gasket
ATC18002 (supplied)
48
1.890
48
1.890 48 1.890
1.890
50
1.969
1 63.5
2.500
66
2.598
50
1.969 66
2.598
1
44.5
1.752
Mounting frame
AT8-DA4 (supplied)
48
Rubber gasket
ATC18002 (supplied)
Panel
AT8-DA4 (supplied)
90
3.543
(11p cap AT8-DP11
sold separately)
(8p cap AD8-RC
sold separately)
11-pin type
8-pin type
for flush mount for flush mount
Mounting frame
( ) dimension is for 8-pin type.
(90.0)
95.5
(3.543)
3.760
AT8-DLA1
(sold separately)
Device installation rail
(11-pin type AT8-DF11K
sold separately)
DIN rail terminal block
(8-pin type AT8-DF8K
sold separately)
80min.
3.150min.
80min.
3.150min.
45 0
+0.6
1.772 0
+.024
45 0
+0.6
1.772 0
+.024
45 0
+0.6
1.772 0
+.024
A=(48 ×n – 2.5)+0.6
0 A=(1.890 ×n – .098)+.024 0
A
When n timers are continuously installed, the dimension
(A) is calculated according to the following formula (n:
the number of the timers to be installed):
LT4H-W
Applicable standard
Safety standard EN61812-1 Pollution Degree 2/Overvoltage Category II
EMC
(EMI)EN61000-6-4
Radiation interference electric field strength
Noise terminal voltage
(EMS)EN61000-6-2
Static discharge immunity
RF electromagnetic field immunity
EFT/B immunity
Surge immunity
Conductivity noise immunity
Power frequency magnetic field immunity
Voltage dip/Instantaneous stop/Voltage fluctuation immunity
EN55011 Group1 ClassA
EN55011 Group1 ClassA
EN61000-4-2 4 kV contact
8 kV air
EN61000-4-3 10 V/m AM modulation (80 MHz to 1 GHz)
10 V/m pulse modulation (895 MHz to 905 MHz)
EN61000-4-4 2 kV (power supply line)
1 kV (signal line)
EN61000-4-5 1 kV (power line)
EN61000-4-6 10 V/m AM modulation (0.15 MHz to 80 MHz)
EN61000-4-8 30 A/m (50 Hz)
EN61000-4-11 10 ms, 30% (rated voltage)
100 ms, 60% (rated voltage)
1,000 ms, 60% (rated voltage)
5,000 ms, 95% (rated voltage)
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

LT4H-W
Terminal layouts and Wiring diagrams
• 8-Pin type
Relay output type Transistor output type Relay output type Transistor output type
• 11-Pin type
N.C.
N.O.
8
5
17
6
2
34
(–) (+)
Operating
voltage
Start
Reset
8
5
17
6
2
34
(–) (+)
Operating
voltage
Start
Reset
Operating
voltage
N.O.
N.C.
3
5
4
211110
9
8
7
6
Reset
Start
Stop
Lock
–+
3
5
4
211110
9
8
7
6
Operating
voltage
–+
Reset
Start
Stop
Lock
Relay output type Transistor output type
• Screw terminal type
54321
109876
N.O.
N.C.
Operating
voltage
Reset
Start
Stop
Lock
+–
54321
109876
Reset
Start
Stop
Lock
Operating
voltage
+–
Note) For connecting the output leads of the transistor output type, refer to
5) Transistor output on page 48.
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

LT4H-W
Setting the operation mode and time range
Setting procedure 1) Setting the time range (Timer T1/Timer T2)
Set the time range with the DIP switches on the side of the LT4H-W timer.
Setting procedure 2) Setting the operation mode
Set the operation mode with the keys on the front of the LT4H-W timer.
Front display section
DIP switch
Item DIP switch No.
1 2 3
ON ON ON 0.01 s to 99.99 s
OFF OFF OFF 0.1 s to 999.9 s
ON OFF OFF 1 s to 9999 s
OFF ON OFF 0 min 01 s to 99 min 59 s
ON ON OFF 0.1 min to 999.9 min
OFF OFF ON 0 h 01 min to 99 h 59 min
ON OFF ON 0.1 h to 999.9 h
OFF ON ON 1 h to 9999 h
Table 1: Setting the time range (Timer T1)
Table 2: Setting the time range (Timer T2)
Time range
Time range
(Timer T1)Refer to table 1
1
2
3
Minimum input reset, start, and
stop signal width 20 ms 1 ms
*4
Time delay direction Addition
Subtraction 5
Time range
(Timer T2)Refer to table 2
6
7
8
ONOFF
DIP switch No.
6 7 8
ON ON ON
OFF OFF OFF
ON OFF OFF
OFF ON OFF
ON ON OFF
OFF OFF ON
ON OFF ON
OFF ON ON
Time range
Notes: 1) Set the DIP switches before installing the timer.
2) When the DIP SW setting is changed, turn off the power once.
3) The DIP switches are set as ON before shipping.
* The 8-pin type does not have the stop input, so that the dip
switch can be changed over between reset and start inputs.
The signal range of the lock input is fixed (minimum 20 ms).
123
DIP switches
45678
ON
QElapsed time display
WSet time display
ET1/T2operation indicator
RT1/T2setting value
selectable indicator
TControlled output
indicator
YLock indicator
UTime units display
IUP keys
Changes the corresponding digit of the set time in the addition direc-
tion (upwards)
ODOWN keys
Changes the corresponding digit of the set time in the subtraction
direction (downwards)
PRESET switch
Resets the elapsed time and the output
{SET/LOCK switch
Changes over the display between T1/T2settings, sets the operation
mode, checks the operation mode and locks the operation of each key
(such as up, down or reset key).
T2
T1
T2
DOWN
T1
UP
SET/LOCK
RESET
smh
LOCK
OP.
LT4H-W
TIMER
11
10
6
5
4
9
8
7
2
1
3
Fourth digit First digit
1) Setting or changing the operation mode
(1) When the UP or DOWN key at the first digit is pressed with the SET/LOCK
switch pressed, the mode is changed over to the setting mode.
(2) Now release the SET/LOCK switch.
(3) The operation mode in the setting mode is changed over sequentially in the left or right direction by pressing the UP or DOWN key at the first digit, respectively.
(4) The operational mode displayed at present is set by pressing the RESET switch, and the display returns to the normal condition.
2) Setting (changing) the time
(1) Pressing the SET/LOCK key switches the set value display between T1 and T2. Display the timer (T1 or T2) which is to be set (or changed).
(2) After displaying the timer (T1 or T2) which is to be set, press the UP or DOWN key to change the time.
• Checking the operation mode
When the UP or DOWN key at the second digit is pressed with the SET/LOCK switch pressed, the operational mode can be checked.
The display returns to the normal condition after indicating the operational mode for about two seconds. (While the display indicates the operational mode for about two
seconds, the other indicators continue to operate normally.)
• Setting the lock
When the UP or DOWN key at the fourth digit is pressed with the SET/LOCK switch pressed, all keys on the unit are locked.
The timer does not accept any of UP, DOWN and RESET keys.
To release the lock setting, press the UP or DOWN key at the fourth digit again with the set/lock switch pressed.
* Operational mode, adding and subtracting and minimum input signal range cannot be set at T1and T2, respectively.
• Changing over the T1/T2setting display
The T1/T2 setting display is changed over by pressing the SET/LOCK switch. (This operation gives no effect on the other operations. The set time and elapsed time
(residual time) at T1are linked with those at T2.)
• Changing the set time
1) It is possible to change the set time with the UP and DOWN keys even during time delay with the timer. However, be aware of the following points.
(1) If the set time is changed to less than the elapsed time with the time delay set to the addition direction, time delay will continue until the elapsed time reaches full
scale, returns to zero, and then reaches the new set time. If the set time is changed to a time above the elapsed time, the time delay will continue until the elapsed
time reaches the new set time.
(2) If the time delay is set to the subtraction direction, time delay will continue until “0” regardless of the new set time.
2) When the set times at T1and T2are set to 0, the output becomes ON only while the start input is carried out. However, while the reset input is carried out, the output
becomes OFF.
Ex: Setting operation mode display
(PULSE-A example)
Pulse input
OFF-start
Repeating operation
Pulse input
OFF-start
One operation
Pulse input
ON-start
Repeating operation
Integrating input
OFF-start
One operation
Integrating input
ON-start
Repeating operation
OFF-start
Repeating operation
Integrating input
0.01 s to 99.99 s
0.1 s to 999.9 s
1 s to 9999 s
0 min 01 s to 99 min 59 s
0.1 min to 999.9 min
0 h 01 min to 99 h 59 min
0.1 h to 999.9 h
1 h to 9999 h
(same for screw terminal type and 8-pin type.)
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

LT4H-W
Delayed
one shot
A
: Pulse input
PULSE : Integrating input INTEGRATION
• The pulse input mode starts the operation by starting the
start input.
• When using the unit by starting it with the power on, short-
circuit the start terminal (8-pin: Qto R, 11-pin: Eto Yand
screw terminal: to ).
96
• Each signal input such as start, reset, stop and lock inputs is applied by short-circuiting its input terminal and common terminal
(8-pin type: terminal Q, 11-pin type: terminal Eand screw terminal: terminal ) respectively.
• The 8-pin type does not have a stop input or lock input.
6
• The integrating input mode is operated by the integrated
time of the start input. In other word, the timer operates only
when the start input is performed.
• When the elapsed value is cleared by the reset input, the
output is reset.
• When using the unit by starting it with the power on, short-
circuit the start terminal (8-pin: Qto R, 11-pin: Eto Yand
screw terminal: to ).
96
OFF-start/1 operation t1<T1, t2<T2
APULSE
Power
Output
Reset
Start
Stop
T1 T2 ta
ta+tb=T1
tctb td t1
tc+td=T2
T1 t2
supply
OFF-start/1 operation t1<T1, t2<T2
AINTEGRATION
tb
Stop
Start
Reset
Output
Power
ta T1tc td te tf tg th
ta+tb=T1
t1
tc+td=T2 tg+th=T2
t2
te+tf=T1
supply
OFF-start
flicker
B
OFF-start/repeating operation t1<T1, t2<T2
BPULSE
tc
Power
Output
Stop
Reset
Start
T2T1 T2T1 ta tb td t1 T1 t2
ta+tb=T1 tc+td=T2
supply
OFF-start/repeating operation t1<T1, t2<T2
BINTEGRATION
tb
Start
Reset
Stop
Output
ta
Power
T1
tc+td=T2
tetc td tf tg T2T1th t1
ta+tb=T1
t2
tg+th=T2te+tf=T1
supply
ON-start flicker
C
Remarks
and notes
ON-start/repeating operation t1<T1, t2<T2
CPULSE
Start
Reset
Stop
Output
Power
supply
ta+tb=T1 tc+td=T2
ta tb tc td t1 t2T1T1 T2 T1 T2
ON-start/repeating operation t1<T1, t2<T2
CINTEGRATION
tb
Stop
Start
Reset
Output
Power
ta
tc+td=T2
T1tf tgtc td te t1th T1 T2
ta+tb=T1 tg+th=T2
t2
te+tf=T1
supply
OPERATION MODE
• Elapsed value cleared when power is turned on.
• Time limit start initiated when start input goes on; start input ignored if time limit interval
is in progress.
• Elapsed value cleared when one operation has been completed.
• Elapsed value not cleared when power is turned on (power failure backup function).
• When power is turned back on, same status is maintained for output as that previous
to power going off.
• Elapsed value cleared when one operation has been completed.
• Elapsed value cleared when power is turned on.
• Time limit start initiated when start input goes on; start input ignored if time limit interval
is in progress.
• Elapsed value not cleared when power is turned on (power failure backup function).
• When power is turned back on, same status is maintained for output as that previous
to power going off.
• Elapsed value cleared when power is turned on.
• Time limit start initiated when start input goes on; start input ignored if time limit interval
is in progress.
• Elapsed value not cleared when power is turned on (power failure backup function).
• When power is turned back on, same status is maintained for output as that previous
to power going off.
All Rights Reserved © COPYRIGHT Matsushita Electric Works, Ltd.

47
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
flush mounting, the screw-down terminal
type is recommended. For the pin type,
use either the rear terminal block
(AT78041) or the 8P cap (AD8-RC) for
the 8-pin type, and the rear terminal
block (AT78051) or the 11P cap (AT8-
DP11) for the 11-pin type. Avoid solder-
ing directly to the round pins on the unit.
When using the instrument with a front
panel installation, use the DIN rail termi-
nal block (AT8-DF8K) for the 8-pin type
and the DIN rail terminal block (AT8-
DF11K) 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 Wthrough U(8-pin
type) Wthrough P(11-pin type) or
and (screw 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.
2. Input connections
The power circuit has no transformer
(power and input terminals are not insu-
lated). 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.
When power circuitry is not independent,
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.
(2) Non-contact point input
Connect with an open collector. Use
transistors whose characteristics satisfy
the criteria given below.
VCEO = 20 V min.
IC= 20 mA min.
ICBO = 6µA max.
Also, use transistors with a residual volt-
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
Start input
Stop input
Lock
input
Reset input
12 to 40V DC
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
Start input
Stop input
Lock
input
8-pin type
Screw terminal type
1——4 3
11-pin type 3 4 5 6 7
6 7 8 9 10
PRECAUTIONS IN USING THE LT4H SERIES
* The short-circuit impedance should be
less than 1 kΩ.
[When the impedance is 0 Ω, the current
coming from the start input and stop
input terminals 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 kΩ.
* 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.
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) The LT4H series use power supply
without a transformer (power and input
terminals are not insulated). In connect-
ing various kinds of input signals, there-
fore, use a power transformer in which
the primary side is separated from the
ungrounded secondary side as shown in
Fig. A, for the power supply for a sensor
and other input devices so that short-cir-
cuiting can be prevented.
10
2
3
(Fig. A)
Input contact
point or transistor
2
3
10
Power
supply
Input
terminal
terminal
Input
10
2
3
3
2
10
(Fig. B)
Input contact
point or transistor
Power
supply
point or transistor
Input contact
terminal
Input
terminal
Input
(Fig. C)
Power
supply
3
3
Input contact
point or transistor
10
2
10
2
terminal
Input
terminal
Input

48
Noise wave form (noise simulator)
Rise time: 1 ns
Pulse width: 1 µs, 50 ns
Polarity: ±
Cycle: 100 cycles/second
5) When connecting the operating power
supply, make sure that no leakage cur-
rent enters the timer. For example, when
performing contact protection, if set up
like that of fig. A, leaking current will
pass through C and R, enter the unit,
and cause incorrect operation. The fig. B
shows the correct setup.
• Surge wave form
[± (1.2 ×50) µs uni-polar full wave voltage]
100
90
50
30
00 1.2
Time (µs)
Surge voltage (%)
50
Peak
T
T
CR
(Fig. A)
(Fig. B)
Operating power supply
Leakage current
R
C
Operating power supply
Load’s
power supply
Inductive load
LT4H timer
Diode rating:
IF(forward current): 1 A
VR(reverse voltage): 600 V
Once the wiring to be used is completely
installed and prior to installing this timer,
confirm that there is complete insulation
between the wires connected to the
power terminals (2 each) and the wires
connected to each input terminal. If the
power and input lines are not insulated, a
short-circuit may occur inside the timer
and result in internal damage.
In addition, when moving your equipment
to a new installation location, confirm
that there is no difference in environmen-
tal conditions as compared to the previ-
ous location.
4) The input signal is applied by the
shorting of each input terminal with the
common terminal (terminal Qfor 8-pin
types, terminal Efor 11-pin types and
terminal for screw terminal types).
Never connect other terminals or volt-
ages higher than 40V DC, because it
may destroy the internal circuitry.
5) Transistor output
(1) Since the transistor output is insulat-
ed from the internal circuitry by a pho-
tocoupler, it can be used as an NPN
output or PNP (equal value) output.
(The above example is 11-pin type)
6
Load
Load’s power supply
LT4H timer
{OI
As NPN output
Load
Load’s power supply
LT4H timer
As PNP output
{OI
(2) Use the diode connected to the out-
put transistor’s collector for absorbing
the reverse voltage from induced loads.
6) When wiring, use shielded wires or
metallic wire tubes, and keep the wire
lengths as short as possible.
7) For the load of the controlled output,
make sure that it is lower than the rated
control capacity.
4. Operation of LT4H digital timer
1) Turning on and off the power supply
while operating in A2* (Power on delay
2) or G (Totalizing On delay) will result in
a timer error to be generated due to the
characteristics of the internal circuitry.
Therefore, use the start input or stop
input.
* Not related to the start input.
2) When controlling the timer by turning
on the power supply, use only A (Power
on delay 1) or A2 (Power on delay 2).
Use of other modes in this situation will
result in timer errors. When using the
other modes, control the timer with the
start input or stop input.
5. Operation mode and time range set-
ting
The operation mode and time range can
be set with the DIP switches on the side
of the timer. Make the DIP switch set-
tings before installing the timer on the
panel.
The operation mode of LT4H-W series
can be set with the keys and switches on
the front of the timer.
6. Conditions of usage
1) Avoid locations subject to flammable
or corrosive gases, excessive dust, oil,
vibrations, or excessive shocks.
2) Since the cover of the timer is made of
polycarbonate resin, avoid contact with
or use in environments containing methyl
alcohol, benzene, thinners, and other
organic solvents; and ammonia, caustic
sodas, and other alkaline substances.
3) If power supply surges exceed the val-
ues given below, the internal circuits may
become damaged. Be sure to use surge
absorbing element to prevent this from
happening.
4) Regarding external noise, the values
below are considered the noise-resistant
voltages. If voltages rise above these
values, malfunctions or damage to the
internal circuitry may result, so take the
necessary precautions.
Operating voltage Surge voltage (peak value)
AC type 6,000V
DC type
24V AC type 1,000V
Power supply terminals Input
terminals
AC type DC type
24V AC type
Noise
voltage 1,500V 1,000V 600V
Note: With the 8-pin type, there is no diode
between points Iand O.
PRECAUTIONS IN USING THE LT4H SERIES
(e.g., sensor)
Timer
Timer
AC power supply
(e.g., sensor)
Input device
Insulation transformer
Timer
Insulation transformer
(Fig. B) Bad example
AC power supply
(Fig. A) Good example
AC power supply
Input device
(+)
(–)
(–)
Input device
(e.g., sensor)
Alternative
current flow
Single coil transformer
(+)
(–)
(+)
(–)
(–)
(–)

49
Display Contents
Malfunctioning CPU. Enter reset input, RESET
key, or restart unit.
The values at start-up before the CPU
malfunction occurred.
0
Malfunctioning memory. See
note.
OFF
Output condition Restoration procedure Preset values after restoration
7. Self-diagnosis function
If a malfunction occurs, one of the following displays will appear.
Note: Includes the possibility that the EEPROM’s life has expired.
6) Long periods of continuous operation
in the time-up completed condition (one
month or more) will result in the weaken-
ing of the internal electrical components
from the generated heat and, therefore,
should be avoided. If you do plan to use
the unit for such continuous operation,
use in conjunction with a relay as shown
in the circuit in the diagram below.
7. Acquisition of CE marking
Please abide by the conditions below
when using in applications that comply
with EN61812-1.
1) Overvoltage category III,
pollution level 2
2) This timer employs a power supply
without a transformer, so the power and
input signal terminals are not insulated.
(1) When a sensor is connected to the
input circuit, install double insulation on
the sensor side.
(2) In the case of contact input, use dual-
insulated relays, etc.
3) The load connected to the output con-
tact should have basic insulation.
This timer is protected with basic insula-
tion and can be double-insulated to meet
EN/IEC requirements by using basic
insulation on the load.
4) Please use a power supply that is pro-
tected by an overcurrent protection
device which complies with the EN/IEC
standard (example: 250 V 1 A fuse, etc.).
5) You must use a terminal socket or
socket for the installation. Do not touch
the terminals or other parts of the timer
when it is powered. When installing or
un-installing, make sure that no voltage
is being applied to any of the terminals.
6) Do not use this timer as a safety cir-
cuit. For example when using a timer in a
heater circuit, etc., provide a protection
circuit on the machine side.
R
R
T
T
RR
Relay Timer Receive output
from contact
at relay R
PRECAUTIONS IN USING THE LT4H SERIES