KT (AKT2,4,7,8,9,4H,4B)
15
Communication Function Connection Diagram (PLC Connection Diagram)
3. KT4H/4B series
NOTICE ON OPERATION
1. KT2, 4, 8 and 9 series 2. KT7 series
Notes: 1. Terminating Resistors (Terminators)
The KT series has a built-in pull-up resistor or pull-down resistor, which
serves as the terminating resistor. For this reason, do not connect the
terminating resistor on the communication line.
2. Please use a RJ-116 polarized type modular connector.
Please use a cable that is suitable for a modular connector.
Shielded cable
RS-485
KT4
YA (–)
YB (+)
COM
13
14
15
KT8 , 9
YA (–)
YB (+)
COM
11
14
17
KT4
YA (–)
YB (+)
COM
13
14
15
KT2
YA (–)
YB (+)
COM
10
11
12
KT2
YA (–)
YB (+)
COM
10
11
12
KT8 , 9
YA (–)
YB (+)
COM
11
14
17
PLC
(–)
(+)
Communicatin cable
No.0
No.1
KT7
No.30
Terminal
3
to YB (+)
Terminal
4
to YA (–)
PLC
(–)
(+)
Shielded cable
RS-485
KT4H
16
YA (−)
17
YB (+)
18
COM
KT4H
16
YA (−)
17
YB (+)
18
COM
PLC
(−)
(+)
Notes:
1. To prevent current flow along shield sections, ground one end of the shield line. (If both ends of the
shield section are grounded, a closed circuit with the earth will form and electricity flowing through the
shield line will cause increased susceptibility to noise.)
2. Terminating Resistors (Terminators)
The KT4H series has a built-in pull-up resistor or pull-down resistor. For this reason, do not connect the
terminating resistor on the communication line.
1. NOTICE ON SITE SELECTION
This instrument is intended to be used in
the following environment (IEC61010-1)
Overvoltage category II, Pollution degree
2
Mount the controller in a place with:
1) A minimum of dust, and an absence of
corrosive gases
2) No flammable, explosive gases
3) Few mechanical vibrations or shocks
4) No exposure to direct sunlight, an
ambient temperature of 0 to 50°C (32 to
122°F) that does not change rapidly
(When installing inside a panel, make
particular allowance for heat dissipation.
Avoid installation in situations such as
above equipment that generates heat.)
5) Locations in which temperature rapidly
changes may cause condensation.
6) Locations or atmospheres in which
gasoline, thinners, alcohol, or other
organic solvents are present, or in which
ammonia, sodium hydroxide, or other
strong alkaline substances may adhere.
7) Locations susceptible to direct impact
or the transmission of vibrations, or
where splashing with water is possible.
8) In the proximity of equipment in which
large switching surges occur or near
high-voltage cables, high-voltage
equipment, power lines, power
equipment, ham radio transmitters, or
equipment containing these or similar
devices.
9) An ambient non-condensing humidity
of 35 to 85%RH
10) No large capacity electromagnetic
switches or cables through which large
current is flowing
11) No water, oil or chemicals or where
the vapors of these substances can come
into direct contact with the controller
2. NOTICE ON THE WIRING
1) The terminal block of KT4, 8, 9, 4H, 4B
series are designed to be wired from the
left side (KT2 series are designed to be
wired from the upper and lower direction).
The lead wire must be inserted from the
left side of the terminal, and fastened by
the terminal screw. Use a solderless
terminal with insulation sleeve that fits to
the M3 screw.
2) Terminal fastening torque is approxi-
mately 0.6N·m to 1.0N·m (KT4, 8, 9, 4H
and 4B).
For KT7 series by M3.0 screw is less
than 0.5N·m and by M2.0 screw 0.25N·m
respectively.
3) Use a thermocouple and
compensating lead wire according to the
input specification of the controller.
4) Use a 3-wire system of RTD according
to the input specification of the controller.
5) This controller has no built-in power
switch, circuit breaker or fuse. Therefore,
it is necessary to install them in the circuit
near the external controller.
(Recommended fuse: Time-lag fuse,
rated voltage 250V AC, rated current 2A)
6) In the case of 24V AC/DC power
supply, do not confuse the polarity when
it is DC.
7) With the relay contact output type, use
an auxiliary electromagnetic switch
externally according to the capacity of the
load to protect the built-in relay contact.
8) When wiring, keep input wire
(thermocouple, RTD, etc.) away from AC
source and load wire to avoid external
interference.
9) Turn the power supply to the
instrument off before wiring or checking.
Working or touching the terminal with the
power switched on may result in Electric
Shock which could cause severe injury or
death.
Wire-
pressed
terminal
Company
name
Part number
Fastening
torque
Fork type
NICHIFU
Co., Ltd.
1.25Y-3
0.6 N⋅m,
Max.
1.0 N⋅m.
J.S.T. Mfg.
Co., Ltd.
VD1.25-B3A
Round
type
NICHIFU
Co., Ltd.
1.25-3
J.S.T. Mfg.
Co., Ltd.
V1.25-3
3.2mm dia. 3.2mm
Max. 5.8mm Max. 5.8mm
.126inch dia. .126inch
.228inch .228inch
