Page 1
48
1.890
48
1.890
64.5
2.539
LT4H-W
02/2003
DIN 48 SIZE
DIGITAL TIMER
LT4H-W
UL File No.: E122222
CSA File No.: LR39291
mm inch
8 Pin type 11 Pin type Screw terminal
type
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 999min 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 and Pin Type 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. Conforms With EMC and Low
Voltage Directives
Conforms with EMC directives
(EN50081-2/EN50082-2) and low
-voltage directives (VDE0435/Part 2021)
for CE certification vital for use in
Europe.
9. Good performance
All this at an affordable price to provide
you with unmatched cost performance.
PRODUCT TYPES
Time range Operation mode Output Operation voltage Power down insurance Terminal Part No.
8 pin LT4HW8-AC240V
Relay
(1 c)
99.99s
999.9s
9999s
99min59s
999.9min
99h59min
999.9h
9999h
* A rubber gasket (ATC18002) and a mounting frame (AT8-DA4) are included.
Pulse input:
• Delayed one shot
• OFF-start flicker
• ON-start flicker
Integrating input:
• Delayed one shot
• OFF-start flicker
• ON-start flicker
Transistor
(1 a)
100-240 V AC
24 V AC / 24 V DC
12-24 V DC
Available
100-240 V AC
24 V AC / 24 V DC
12-24 V DC
11 pin LT4HW-AC240V
Screw LT4HW-AC240VS
8 pin LT4HW8-AC24V
11 pin LT4HW-AC24V
Screw LT4HW-AC24VS
8 pin LT4HW8-DC24V
11 pin LT4HW-DC24V
Screw LT4HW-DC24VS
8 pin LT4HWT8-AC240V
11 pin LT4HWT-AC240V
Screw LT4HWT-AC240VS
8 pin LT4HWT8-AC24V
11 pin LT4HWT-AC24V
Screw LT4HWT-AC24VS
8 pin LT4HWT8-DC24V
11 pin LT4HWT-DC24V
Screw LT4HWT-DC24VS
44
Page 2
PART NAMES
Fourth digit First digit
T1
Controlled output indicator
Lock indicator
Reset switch
Set/Lock switch
SET/LOCK
RESET
LOCK
OP.
T2
T1/T2 Operation display
Display for change-over
TIMER
T1
T2
Set time display
Time units display
Up keys
Down keys
DOWN
UP
hms
(Subtraction elapsed
time display)
Elapsed time display
LT4H-W
between T1/T2 settings
(
Same for 8-pin and screw terminal type
)
1
DIP switches
2345678
ON
02/2003
SPECIFICATIONS
Item
Operating voltage
100 to 240 V AC, 24 V AC
Frequency
Power consumption
Control capacity (resistive)
Time range
Time counting direction
Rating
Operation mode
Signal, Reset, Stop input
Lock input
Input signal
Indication
Power failure memory
method
Time
accuracy
(max.)
Operating time fluctuation
Temperature error
Voltage error
Setting error
Contact arrangement
Contact
Initial contact resistance
Contact material
Life
Mechanical
Electrical
Operating voltage range
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
Electrical
Initial breakdown voltage
Initial insulation resistance
(At 500 V DC)
Operating voltage reset
time
Temperature rise
Functional
Destructive
Functional
Destructive
Mechanical
Vibration
resistance
Shock
resistance
Ambient temperature
Operating
conditions
Ambient humidity
Air pressure
Ripple rate
Connection
Protective construction
Note: 1) the 24 V AC type can be operated also with 24 V DC.
AC type
50/60 Hz common
Max. 10 V A
99.99s, 999.9s, 9999s, 99min59s, 999.9min, 99h59min, 999.9h, 9999h (selected by DIP switch)
± (0.005% + 50 ms) in case of power on start
± (0.005% + 20 ms) in case of reset or input signal start
7
2.0 × 10
1.0 × 105ope. (At rated control voltage)
Min. 100 MΩ: Between input and output
—
Ralay output type
1)
5 A, 250 V AC
DC type
12 to 24 V DC
—
Max. 3 W
100 to 240V AC, 24V AC
50/60 Hz common
Max. 10 V A
Transistor output type
AC type DC type
1)
100 mA, 30 V DC
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)
Min. input signal width: 20 ms
Open collector input Input impedance: Max. 1 kΩ; Residual voltage: Max. 2V
Open impedance: 100 kΩ or less, Max. energized voltage: 40 V DC
7-segment LCD, Elapsed value (backlight red LED), Setting value (backlight yellow LED)
5
EEP-ROM (Min. 10
overwriting)
Operating voltage: 85% to 110%
Temperature: –10°C to +55°C +14°F 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
ope. (Except for switch operation parts)
Timed-out 1 Form A (Open collector)
—
—
—
7
ope. (At rated control voltage)
1.0 × 10
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
Between live and dead metal parts
Between contacts
Min. 100 MΩ: Between live and dead metal parts
Between input and output
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
Min. 294 m 964.567 ft./s
2
(4 times on 3 axes)
2
(5 times on 3 axes)
–10° C to 55° C +14° F to +131° F
Max. 85 % RH
860 to 1,060 h Pa
20 % or less — 20 % or less
8-pin/11-pin/screw terminal
IP66 (front panel with rubber gasket)
LT4H-W
12 to 24 V DC
—
Max. 3 W
45
Page 3
5.5
7.5
.295
UP
m
DOWN
T1
T2
RESET
SET/LOCK
OP.
LOCK
h
T1
T2
TIMER
s
LT4H-W
48
1.890
44.5
1.752
44.5
1.752
7.5
.295
64.5
.217
2.539
5.5 55.6 14.5
.217 2.189 .571
(
Same for 8-pin type
)
installation panel
Rubber gasket
ATC18002 (supplied
)
SET/LOCK
48
1.890
DOWN
LOCK
TIMER
T1
48
1.890
48
1.890
1.890
50
1.969
RESET
OP.
T2
UP
hm
T1
T2
s
LT4H-W
1
63.5
2.500
66
2.598
50
1.969
66
2.598
1
TIMER
RESET
SET/LOCK
44.5
1.752
installation frame for
AT8-DA4 (supplied
)
48
DOWN
LT4H-W
T1
h
LOCK
T1
T2
OP.
T2
sm
UP
Rubber gasket
ATC18002 (supplied
)
installation 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
embedded installations
embedded installations
installation frame for
( ) dimension is for 8-pin type.
(90.0)
95.5
(3.543)
3.760
AT8-DLA1
(
sold separately
)
Device installation rail
(
11-pin type ATC18004
sold separately
)
DIN rail terminal block
(
8-pin type ATC18003
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):
5
81
Signal
Reset
3
2
4
COM
NO
6
7
NC
Operation
voltage
(–) (+)
18
6
7
3
2
45
Signal
Reset
(–) (+)
Operation
voltage
11
1
Reset
Stop
Lock
Signal
4
2
3
5
6
8
9
10
7
COM
NO
NC
(+)
Operation
(–)
voltage
2
4
3
11
1
10
6
5
7
8
9
Reset
Stop
Lock
Signal
(–)(+)
Operation
voltage
Lock
9
4
721638
NC
COM
NO
5
10
Reset
Signal
Stop
(+) (–)
Operation
voltage
12
67
34
89510
Lock
Reset
Signal
Stop
(–)(+)
voltage
Operation
LT4H-W
02/2003
DIMENSIONS (units: mm inch)
• LT4H-W digital timer
Screw-down terminal type
(embedded installation)
• Dimensions for embedded installation (with adapter installed)
Screw-down terminal type Pin type
Pin type (embedded installation/
front panel installation)
•
Dimensions for front panel installations• Installation panel cut-out dimensions
• For connected installations
The standard panel cut-out dimensions are shown
below. Use the installation frame (AT8-DA4) and
rubber gasket (ATC18002).
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 LAYOUT AND WIRING
• 8-Pin type
Relay output type Transistor output type Relay output type Transistor output type
• Screw terminal type
Relay output type Transistor output type
• 11-Pin type
46
Note) For connecting the output leads of the transistor output type, refer to
5) Transistor output on page 40.
Page 4
123
DIP switches
45678
ON
RESET
UP
11
10
SET/LOCK
DOWN
9
8
6
5
4
3
T2
OP.
LOCK
T1
T2
TIMER
T1
LT4H-W
shm
2
7
1
Fourth digit First digit
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
LT4H-W
02/2003
SETTING THE OPERATION MODE, TIMER RANGE, AND TIME
Setting procedure 1) Setting the operation mode and timer range (Timer T1/Timer T2)
Set the operation mode and timer range with the DIP switches on the side of the unit.
DIP switches
Item
1
2
3
Minimum input reset, signal, and
*4
5
6
7
8
* The 8-pin type does not have the stop input, so that the dip
switch can be changed over between reset and signal inputs.
The signal range of the lock input is fixed (minimum 20 ms).
Time range
stop signal width
Time delay direction Addition
Time range
(Timer T
(Timer T
)
1
)
2
DIP switch
ONOFF
Refer to table 1
20 ms 1 ms
Subtraction
Refer to table 2
Table 1: Setting the timer range (Timer T1)
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 2: Setting the timer range (Timer T2)
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
Note: Set the DIP switches before installing the unit.
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
The new settings
are valid after power
OFF ON
Timer range
Timer range
Setting procedure 2) Setting the time
Set the set time with the keys on the front of the unit.
Front display section
Q Elapsed time display
W Set time display
E T1/T2operation indicator
R T1/T2setting value
selectable indicator
T Controlled output
indicator
Y Lock indicator
U Time units display
1) Setting or changing the operational 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 key.
(3) The operational 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.
I UP keys
Changes the corresponding digit of the set time in the addition direction (upwards)
O DOWN keys
Changes the corresponding digit of the set time in the subtraction
direction (downwards)
P RESET switch
Resets the elapsed time and the output
{ Set/lock switch
Changes over the display between T1/T2settings, sets the operational
mode, checks the operational mode and locks the operation of each
key (such as up, down or reset key).
Ex: Setting mode display
(4) The operational mode displayed at present is set by pressing the RESET key, and the display returns to the normal condition.
2) Checking the operational 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.)
3) 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 T
and T2, respectively.
1
4) 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 T
are linked with those at T2.)
1
• 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 T
becomes OFF.
and T2are set to 0, the output becomes ON only while the signal input is carried out. However, while the reset input is carried out, the output
1
47
Page 5
Power
Output
Reset
Signal
Stop
T1 T2
ta
ta+tb=T1
tctb td t1
tc+td=T2
T1 t2
supply
tb
Stop
Signal
Reset
Output
Power
ta T1tc td te tf tg th
ta+tb=T1t1tc+td=T2 tg+th=T2
t2
te+tf=T1
supply
tc
Power
Output
Stop
Reset
Signal
T2T1 T2T1 ta tb td t1 T1 t2
ta+tb=T1 tc+td=T2
supply
tb
Signal
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
tc
Signal
Reset
Stop
Output
Power
T2T1 T2T1 tbta
ta+tb=T1
T1 t2t1td
tc+td=T2
supply
tb
Stop
Signal
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
LT4H-W
02/2003
A
Delayed
one shot
B
OFF-start
flicker
PULSE
: Pulse input
OFF-start/1 operation t1<T1, t2<T
APULSE
OFF-start/repeating operation t1<T1, t2<T
BPULSE
INTEGRATION
2
2
AINTEGRATION
OFF-start/repeating operation t1<T1, t2<T
BINTEGRATION
: Integrating input
OFF-start/1 operation t1<T1, t2<T
2
2
C
ON-start flicker
Remarks
and notes
ON-start/repeating operation t1<T1, t2<T
CPULSE
2
• The pulse input mode starts the operation by starting the signal input.
• When using the unit by starting it with the power on, shortcircuit the signal terminal (8-pin: Q to R, 11-pin: E to Y
and screw: to ).
96
• The integrating input mode is operated by the integrated
time of the signal input. In other word, the timer operates only
when the signal input is performed.
• When the elapsed value is cleared by the reset input, the
output is reset.
ON-start/repeating operation t1<T1, t2<T
CINTEGRATION
• When using the unit by starting it with the power on, shortcircuit the signal terminal (8-pin: Q to R, 11-pin: E to Y and
screw: to ).
96
• Each signal input such as signal, 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 E and screw terminal: terminal ) respectively.
6
• The 8-pin type does not have a stop input or lock input.
2
48
Page 6
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
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
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
LT4H Timer
Input
terminals
Circuit
Rectifier circuits
Power
supply
Insulated transformer
is necessary
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
02/2003
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 (AT8DP11) 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 terminal 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.
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 independently 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
If independent power circuitry must be
used, keep the input contacts or transistors separate from each other, as shown
in Fig. B.
* The short-circuit impedance should be
less than 1 kΩ.
[When the impedance is 0 W, the current
coming from the input 1 and input 2 terminals is approximately 12 mA, and from
the reset input and lock input terminals is
When power circuitry is not independent,
one input signal can be fed to two or more
counters at once, as shown in Fig. C.
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
1
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 transistor. 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 signal is input.
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 operations, use contacts with as short a
bounce time as possible. Also, select a
minimum input signal width of 20 ms.
2) The input mode and output mode
change depending on the DIP switch settings. Therefore, before making any connections, be sure to confirm the operation mode and operation conditions currently set.
3) For the power supply of the input
device, use a single-phase or doublephase insulated power transformer. The
(2) Non-contact point input
second-phase side must not be grounded.
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 voltage of less than 2 V when the transistor
is on.
49
Page 7
Peak value
0
0 1.2 50
30
50
90
100
Time (µs)
Surge voltage (%)
T
T
CR
(Fig. A)
(Fig. B)
Operation power supply
Leakage current
R
C
Operation power supply
R
R
T
T
R
R
Relay Timer
Receive output
from contact
at relay R
Load’s
power supply
Inductive load
LT4H timer
Diode rating:
I
F (forward current): 1 A
V
R (reverse voltage): 600 V
4) The input signal is applied by the
Load
Load’s power supply
LT4H timer
{OI
As NPN output
Load
Load’s power supply
LT4H timer
As PNP output
{OI
02/2003
shorting of each input terminal with the
common terminal (terminal Q for 8-pin
types, terminal E for 11-pin types and
terminal for screw-down terminal
6
types). Never connect other terminals or
voltages higher than DC 40 V, because it
may destroy the internal circuitry.
5) Transistor output
(1) Since the transistor output is insulat-
ed from the internal circuitry by a photocoupler, it can be used as an NPN
output or PNP (equal value) output.
(The above example is 11-pin type)
Note: With the 8-pin type, there is no diode
between points I and O.
(2) Use the diode connected to the output transistor’s collector for absorbing
the reverse voltage from induced loads.
6) When wiring, use shielded wires or
8) Turning on and off the power supply
while operating in A2* (Power on delay)
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 signal input or stop
input.
* Not related to the signal input.
9) 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
signal input or stop input.
10) The operation mode and time range
can be set with the DIP switches on the
side of the timer. Make the DIP switch
settings before installing the timer on the
panel.
4. 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 unit 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 values 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.
Power supply terminals
DC type
24V AC type
Noise
voltage
AC type
1,500V 1,000V 600V
Noise wave form (noise simulator)
Rise time: 1 ns
Pulse width: 1 µs, 50 ns
Polarity: ±
Cycle: 100 cycles/second
Input
terminals
5) When connecting the operation power
supply, make sure that no leakage current enters the counter. For example,
when performing contact protection, if
set up like that of diagram A, leaking current will pass through C and R, enter the
unit, and cause incorrect operation.
Diagram B shows the correct setup.
Operating voltage
AC type 6,000V
DC type
24V AC type
• Surge wave form
[± (1.2 × 50) µs uni-polar full wave voltage]
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.
5. Self-diagnosis function
If a malfunction occurs, one of the following displays will appear.
Display Contents
Note: Includes the possibility that the EEPROM’s life has expired.
50
Malfunctioning CPU.
Malfunctioning memory. See
note.
Surge voltage (peak value)
1,000V
6) Long periods of continuous operation
in the count-up completed condition (one
month or more) will result in the weakening
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.
Output condition Restoration procedure Preset values after restoration
The values at start-up before the CPU
OFF
Enter reset, RESET key,
or restart unit.
malfunction occurred.
0
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