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5. How to Connect Wires
WARNING
• Wiring work must be carried out by a person with basic electrical
knowledge and practical experience.
• Be sure to turn OFF the power supply to the controller before
wiring to avoid an electric shock. Use a tester or similar device
to ensure that no power is being supplied to a cable to be
connected.
• For the wiring cable, the temperature rating is 75 °C or more.
• As a safety measure, always install a circuit breaker (an IEC
60947-compatible product, 5 A, 100 V or 220 V AC) in an easily
accessible location near the instrument. Moreover, provide
indication that the switch is a device for turning off the power to
the instrument.
• Install the power cable keeping a distance of more than 1 cm
from other signal wires.
• The power cable is required to meet the IEC standards concerned or
the requirements of the area in which the instrument is being installed.
• Wiring should be installed to conform to NEC (National Electrical
Code: ANSI/NFPA-70) or the wiring construction standards in
countries or regions where wiring will be installed.
• Since the insulation provided to each relay output terminal is
Functional insulation, provide Reinforced insulation to the
external of the device as necessary. (Refer to the drawing below.)
This product
Functional
insulation
A safety
voltage circuit
A safety
voltage circuit
This product
Reinforced insulation
Reinforced insulation
Functional
insulation
A hazardous
voltage circuit
A hazardous
voltage circuit
A safety
voltage circuit
A safety
voltage circuit
This product
Reinforced insulation
Reinforced insulation
Functional
insulation
A hazardous
voltage circuit
A hazardous
voltage circuit
A hazardous
voltage circuit
A hazardous
voltage circuit
CAUTION
• When connecting two or more crimp-on terminal lugs to the
single terminal block, bend the crimp-on terminal lugs before
tightening the screw.
• Note that the wiring of two or more crimp-on terminal lugs to the
single high-voltage terminal of the power supply and relay, etc.
does not comply with the safety standard.
CAUTION
• Provide electricity from a single-phase power supply. If the
power is noisy, install an isolation transformer on the primary
side, and use a line filter on the secondary side. When measures
against noise are taken, do not install the primary and secondary
power cables close to each other.
• If there is a risk of external lightning surges, use a lightning
arrester etc.
• For TC input, use shielded compensating lead wires for wiring.
For RTD input, use shielded wires that have low conductor
resistance and cause no significant differences in resistance
between the three wires.
• Since the control output relay has a life span (resistance load of
100,000 times), use the auxiliary relay to perform ON/OFF control.
• The use of inductance (L) loads such as auxiliary relays, motors
and solenoid valves causes malfunction or relay failure; always
insert a CR filter for use with alternating current or a diode for
use with direct current, as a spark-removal surge suppression
circuit, into the line in parallel with the load.
• After completing the wiring, the terminal cover is recommended
to use for the instrument.
● Recommended Crimp-on Terminal Lugs
(A)
(F)
(ød
)
5.5 3.3
Recommended tightening torque: 0.6 N·m
Applicable wire size: Power supply wiring 1.25 mm
2
or more
Applicable terminal lug Applicable wire size mm
2
(AWG#)
(φ d)
(A)
(F)
M3
0.25 to 1.65 (22 to 16)
3.3
5.5
4.2
● Cable Specifications and Recommended Cables
Purpose
Name and Manufacturer
Power supply, relay contact outputs
600 V Grade heat-resistant PVC insulated wires, JIS C
3317(HIV), 0.9 to 2.0 mm
2
Thermocouple
Shielded compensating lead wires, JIS C 1610
For thermocouple input (PV input and remote input with direct
input), shielded compensating lead wire of cross-sectional area
less than or equal to 0.75 mm
2
is recommended. If the cross-
sectional area is wide, the reference junction compensation
error may be large.
RTD
Shielded wires (three/four conductors), UL2482 (Hitachi Cable)
Other signals (other than contact output)
Shielded wires
Other signals (contact output)
Unshielded wires
RS-485 communication
Shielded wires
Recommended tightening torque: 0.5 to 0.6 N·m
DC Relay Wiring
R
External DC power supply
Relay
UT32A
UT’s contact
Diode
(Mount it directly
to the relay coil
terminal (socket).)
Relay
(Use one with a relay coil rating
less than the UT’s contact rating.)
AC Relay Wiring
UT32A
R
UT’s contact
CR filter
(Mount it directly
to the relay coil
terminal (socket).)
External AC power supply
Relay
(Use one with a relay coil
rating less than the UT’s
contact rating.)
6. Terminal Wiring Diagrams
CAUTION
• Do not use an unassigned terminal as the relay terminal.
Do not use a 100-240 V AC power supply for the 24 V AC/DC
model; otherwise, the instrument will malfunction.
■ UT32A
(Suffix code: Type1=-R)
PV input
TC input
RTD input
Voltage (mV, V) input
A
+
-
+
-
Current (mA) input
+
-
B
b
(Equipped
as standard)
Control output
Relay contact output
NC
NO
COM
Contact rating: 250 V AC, 3 A
30 V DC, 3 A (resistance load)
111
201
202
203
204
207
208
101
102
103
104
105
106
107
108
109
110
101
-112
201
-212
101
102
103
202
203
201
202
203
202
203
203
204
PV
(Equipped
as standard)
Contact output
External contact output (relay)
AL2
AL1
Relay contact rating: 240 V AC, 1 A
30 V DC, 1 A (resistance load)
Alarm-2 output
(PV low limit)
Alarm-1 output
(PV high limit)
Common
Common
UT
106
107
108
109
ALM
OUT
Factory default:
PV input type is
undefined.
Current/voltage pulse output
0-20 mA DC,
4-20 mA DC,
Voltage pulse (12 V)
+
-
Control output
(Suffix code: Type1=-V or -C)
207
208
OUT
112
Power supply
24 V AC/DC power supply
-
+
100-240 V AC power supply
Allowable range:
100-240 V AC (+10%/-15%)
(free voltage)
50/60 Hz shared
N
L
(24 V AC/DC power supply:
Option code /DC)
110
111
110
111
112
112
N
L
+
24 V DC loop power supply
21.6-28.0 V DC
(Max. 30 mA DC)
-
24 V DC loop power supply
(Option code /LP)
305
306
LPS24
RS-485
SDB(+)
SDA(-)
RDB(+)
RDA(-)
SG
RS-485 communication
(Suffix code: Type 2=1)
301
302
303
304
305
RS485
RS-485
RSB(+)
RSA(-)
SG
RS-485 communication/24 V DC loop power supply
+
24 V DC loop power supply
21.6-28.0 V DC
(Max. 30 mA DC)
-
301
302
303
305
306
RS485/LPS24
(Suffix code: Type 2=1 and option code /LP)
301
302
303
304
305
306
E1-terminal area
