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Installation Section 3-1
Power Supply
The applicable power supply specifications are as follows.
Parts Used for Connection
Note For the connection to the power supply terminal block, twisted wires of 2 mm
2
or greater cross sectional area and M3.5 size crimp terminals must be used.
Tighten the screws on the terminal block to a torque of 0.8 N
⋅m.
Recommended Terminals
Note Conformance to Shipbuilding Standard
• Cover the entire PT with electromagnetic shielding, and ground the elec-
tromagnetic shielding to the control panel with copper tape or other elec-
trically conductive tape.
Recommended electromagnetic shielding: E09F100 or E09R13502P
Manufacturer: Seiwa Electric MFG, Co., Ltd.
• Use gaskets or other materials to completely shield all openings and
other gaps in the control panel.
• Use copper tape or other electrically conductive tape to shield gaps
between the cutout and the PT before securing the PT in place.
• To suppress noise terminal voltage, perform installation under the follow-
ing conditions. It is recommended to use the following product for the DC
power supply.
Recommended Power Supply model: S82K-03024
Manufacturer: OMRON
3-1-4 Grounding
The NT631/NT631C has a functional ground terminal ( ).
Carry out wiring under the following conditions.
Item Value
Power supply 24 VDC
Allowable power supply voltage
fluctuation range
20.4 to 26.4 VDC (24 VDC –15% to +10%)
Power supply voltage capacity NT631-ST211 (B)-EV2:
30 W or more (Power supply warm-up time
within 200 ms.)
NT631C-ST141 (B) /ST153 (B)-EV3:
18 W or more
Maker Type
(fork type)
Type
(round type)
Applicable Wire
(stranded wire)
Japan Solderless Terminal MFG 2-YS3A 2-3.5
2.0 to 2.63 mm
2
Fuji Terminal 2-YAS3.5 V2-S3.5
Nichifu Terminal 2Y-3.5 2-3.5
Fork type Round type
7 mm max. 7 mm max.