LT4H
DIN 48 SIZE
DIGITAL TIMER
UL File No.: E122222
C-UL File No.: E122222
LT4H
Features
48
1.890
48
1.890
64.5
2.539
mm
inch
Pin type
Screw terminal type
• 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.
• Simple Operation
Seesaw buttons make operating the
unit even easier than before.
• 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.
• Conforms to IP66’s Weather
Resistant Standards
The water-proof panel keeps out water
and dirt for reliable operation even in
poor environments.
• 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.
• Changeable Panel Cover
Also offers a black panel cover to meet
your design considerations.
• Compliant with UL, c-UL and CE.
Product types
Time range
Operating mode
Output
Operating voltage
Power down insurance
Terminal type
8 pins
100 to 240 V AC
11 pins
Screw terminal
8 pins
Relay
(1 c)
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)
Transistor
(1 a)
24 V AC
11 pins
Screw terminal
8 pins
12 to 24 V DC
Available
100 to 240 V AC
11 pins
Screw terminal
8 pins
11 pins
Screw terminal
8 pins
24 V AC
11 pins
Screw terminal
8 pins
12 to 24 V DC
* A rubber gasket (ATC18002) and a mounting frame
(AT8-DA4)
are included.
11 pins
Screw terminal
Part number
LT4H8-AC240V
LT4H-AC240V
LT4H-AC240VS
LT4H8-AC24V
LT4H-AC24V
LT4H-AC24VS
LT4H8-DC24V
LT4H-DC24V
LT4H-DC24VS
LT4HT8-AC240V
LT4HT-AC240V
LT4HT-AC240VS
LT4HT8-AC24V
LT4HT-AC24V
LT4HT-AC24VS
LT4HT8-DC24V
LT4HT-DC24V
LT4HT-DC24VS
Part names
Time delay indicator
TIMER
(Countdown time display)
DIP switches
ON
1
2
3
4
5
6
7
8
Elapsed time display
Set time display
Controlled output indicator
Reset indicator
Lock indicator
RESET
OP.
RST
LOCK
h
m
UP
s
Time units display
Up keys
LOCK
Reset switch
Lock switch
LT4H
Down keys
DOWN
09/2009
(Same for screw terminal type and 8-pin type)
14
LT4H
Specifications
Type
Item
Rated operating voltage
Rated frequency
Rated power consumption
Rated control capacity
Time range
Time counting direction
Rating
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)
Life
Electrical (contact)
Allowable operating voltage range
Breakdown voltage
(Initial value)
Electrical
Insulation resistance
(Initial value)
Operating voltage reset
time
Temperature rise
Functional
Destructive
Functional
Shock
resistance
Destructive
Ambient temperature
Ambient humidity
Air pressure
Ripple rate
Vibration
resistance
1.0x10 ope. (At rated control voltage)
5
Relay output type
Transistor output type
AC type AC/DC type
DC type
AC type AC/DC type
DC type
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
24 V AC/DC
24 V AC/DC
50/60 Hz common
50/60 Hz common
—
—
Max. 10 V A
Max. 10 V A
Max. 3 W
Max. 3 W
5 A, 250 V AC (resistive load)
100 mA, 30 V DC
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 k ; Residual voltage: Max. 2 V
Open impedance: 100k or 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. 10 overwriting)
5
Time
accuracy
(max.)
± (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 m (at 1 A 6 V DC)
Ag alloy/Au flash
Min. 2x10 ope. (Except for switch operation parts)
7
[
Operating voltage: 85 to 110%
Temperature: –10 to +55°C
+14 to +131°F
Min. input signal width: 1ms
Timed-out 1 Form A (Open collector)
—
—
—
]
Contact
Min. 10 ope. (At rated control voltage)
7
85 to 110 % of rated operating voltage
2,000 Vrms for 1 min: Between live and dead metal parts (11-pin)
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 input and output
1,000 Vrms for 1 min: Between contacts
Min. 100 M : Between live and dead metal parts
Between live and dead metal parts
Between input and output (At 500V DC)
Min. 100 M : Between input and output (At 500V DC)
Between contacts
Max. 0.5 s
Max. 65° C
—
(under the flow of nominal operating current at nominal voltage)
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)
Min. 98 m
321.522 ft./s
(4 times on 3 axes)
Min. 294 m
964.567 ft./s
(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
—
20 % or less
—
20 % or less
8-pin/11-pin/screw terminal
IP66 (front panel with rubber gasket)
2
2
Mechanical
Operating
conditions
Connection
Protective construction
Applicable standard
Safety standard
EN61812-1
(EMI)EN61000-6-4
Radiation interference electric field strength
Noise terminal voltage
(EMS)EN61000-6-2
Static discharge immunity
RF electromagnetic field immunity
EMC
EFT/B immunity
Surge immunity
Conductivity noise immunity
Power frequency magnetic field immunity
Voltage dip/Instantaneous stop/Voltage fluctuation immunity
Pollution Degree 2/Overvoltage Category II
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)
09/2009
15
Digital
Timers
LT4H
Dimensions
• LT4H digital timer
Screw terminal type
(Flush mount)
Digital
Timers
48
1.890
TIMER
(units: mm
inch)
Tolerance: 1.0
.039
Pin type
(Flush mount/Surface mount)
5.5
.217
55.6
2.189
14.5
.571
5.5
.217
64.5
2.539
OP.
RST
LOCK
RESET
LOCK
h
m
UP
s
44.5
1.752
44.5
1.752
LT4H
DOWN
7.5
.295
7.5
.295
• Dimensions for embedded installation (with adapter installed)
Screw terminal type
Pin type
Rubber gasket
ATC18002 (supplied)
TIMER
Panel
Mounting frame
for flush mount
AT8-DA4 (supplied)
Rubber gasket
ATC18002 (supplied)
TIMER
Panel
Mounting frame 8-pin type
for flush mount (8p cap AD8-RC
AT8-DA4 (supplied) sold separately)
11-pin type
(11p cap AT8-DP11
sold separately)
48
1.890
OP.
RST
LOCK
RESET
LOCK
h
m
UP
s
50
1.969
66
2.598
44.5
1.752
48
1.890
OP.
RST
LOCK
RESET
LOCK
h
m
UP
s
50
1.969
66
2.598
LT4H
DOWN
LT4H
DOWN
48
1.890
1
.039
63.5
2.500
48
1.890
1
.039
90
3.543
• Dimensions for front panel installations
DIN rail terminal block
(8-pin type AT8-DF8K
sold separately)
(11-pin type AT8-DF11K
sold separately)
• 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).
80 min.
3.150
1.772
+.024
0
• For connected installations
45
+0.6
0
1.772
+.024
0
45
+0.6
0
A
A = (48
n – 2.5)
+0.6
0
Device installation rail
AT8-DLA1
(sold separately)
95.5
(90.0)
3.760
(3.543)
45
+0.6
0
1.772
+.024
0
80 min.
3.150
(
) dimension is for 8-pin type.
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.
Terminal layouts and wiring diagrams
• 8-pin type
Relay output type
N.C.
Start
Transistor output type
Start
• 11-pin type
Relay output type
Reset
Start
Stop
Lock
N.C.
5 6 7
4
3
2
8
9
10
N.O.
Transistor output type
Reset
Start
Stop
Lock
N.O.
Reset
4 5
3
2
–
Reset
4 5
3
2
1 8
6
7
+
–
6
7
+
5 6 7
4
3
2
8
9
10
1 8
1 11
1 11
Operating
voltage
Operating
voltage
–
Operating
voltage
+
–
Operating
voltage
+
• Screw terminal type
Relay output type
Reset
Start
Stop
Lock
6
7
8
9
10
N.C.
N.O.
Transistor output type
Reset
Start
Stop
Lock
6
7
8
9
10
1
2
3
4
5
1
2
3
4
5
+
Operating
voltage
–
Operating
+
voltage
–
Note) For connecting the output leads of the transistor output type, refer to
5) Transistor output on page 26.
09/2009
16
LT4H
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 switch
OFF
ON
Refer to table 1
DIP switch No.
1
2
3
ON
ON
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
ON
OFF
OFF
OFF
ON
ON
OFF
ON
OFF
ON
ON
Item
1
2
3
*4
Operation mode
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
Operation mode
Minimum input reset, start, and
stop signal width
20 ms
1 ms
5
Time delay direction
Addition Subtraction
6
Time range
Refer to table 2
7
8
* 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).
DIP switches
ON
1
2
3
4
5
6
7
8
Table 2: Setting the time range
DIP switch No.
Time range
6
7
8
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
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.
(Same for screw terminal type)
Setting procedure 2) Setting the time
Set the set time with the keys (UP and DOWN keys) on the front of the LT4H timer.
Front display section
Q
Elapsed time display
W
Set time display
E
Time delay indicator
R
Controlled output indicator
T
Reset indicator
Y
Lock indicator
U
Time units display
3
TIMER
I
UP keys
1
2
4
5
6
RESET
UP
OP.
RST
LOCK
Changes the corresponding digit of
the set time in the addition direction
(upwards)
h
m
s
O
DOWN keys
7
8
10
LOCK
Changes the corresponding digit of
the set time in the subtraction direction
(downwards)
11
9
LT4H
DOWN
P
RESET switch
Resets the elapsed time and the output
{
LOCK switch
Locks the operation of all keys on the unit
• 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 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.
• Power failure memory
The EEPROM is used for power failure memory. It has a life of Min. 10
5
over-writings.
The EEPROM is overwriting with the following timing.
Output mode
Power ON delay (2) A2
Addition G
Other modes
Overwrite timing
When power is OFF
Change of preset value or start, reset input
When power is OFF after being ON
When power is OFF after changing preset value
* Be aware that the contents of EEPROM for all modes will be overwritten when power is turned OFF during input to external lock terminals
R
to
E
and
7
to
6
.
Such an action does not exist by doing lock operation from the front.
09/2009
17
Digital
Timers
DIP switches
Table 1: Setting the operation mode
LT4H
Operation mode
Operation type
Explanation
• Set the operation mode
1
2
3
section of the DIP switches
ON ON ON
(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.
Time chart
T: Set time t1, t2, t3, ta<T
Digital
Timers
Power supply
Output
Reset
Stop
ON
OFF
T
ON
OFF
ON
OFF
ON
OFF
t1
t2
t1+t2=T
Power on delay (1)
A
Power on delay (2)
A2
• Set the operation mode
1
2
3
section of the DIP switches
OFF OFF OFF
(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 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.
Power supply
Output
Reset
Stop
ON
OFF
T
ON
OFF
ON
OFF
ON
OFF
t1
t2
t1+t2=T
Signal on delay
B
• Set the operation mode
1
2
3
section of the DIP switches
ON OFF OFF
(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.
Power supply
Output
Reset
Stop
Start
ON
OFF
T
ON
OFF
ON
OFF
ON
OFF
ON
OFF
t1
t2
t1+t2=T
Signal off delay
C
• Set the operation mode
1
2
3
section of the DIP switches
OFF ON OFF
(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.
Power supply
Output
Reset
Stop
Start
ON
OFF
T>ta+tb
ON
OFF
ON
OFF
ON
OFF
ON
OFF
T>t
ta
tb
t
T
Notes:
1) Each signal input (start, reset, stop, and lock) is applied by shorting their input terminal to the common terminal (terminal
Q
for the 8-pin type, terminal
E
for
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.
09/2009
18
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