Power Supply Connection - Omron NT-series Operation Manual

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Power Supply Connection

Note
Reference
Caution
Connect a 24 VDC power supply to the power input terminals.
2
Use 2 mm or thicker wires to prevent voltage drop. Twist the wires together for
wiring.

Make sure you connect the power supply wires with the correct polarity.

Do not connect AC power to the DC terminals.

If the power supply voltage does not conform to the stipulated rating, it could
destroy the terminal or burn internal circuits.

If complying with EC directives (low voltage directives), observe the following
points:
Use a power supply with reinforced insulation to supply power to the PT.
If using the EL display type, embed the rear part of the PT in a control panel
so that, after the product has been made ready for installation, the user
cannot touch any part of it apart from the part where PT operations are per-
formed (the front panel).
24 VDC
+
When using an C200H direct communication the NT600S must be started up be-
fore the host. For details, refer to "Switching the Power ON/OFF When Using
C200H Direct" (page 62). When not using C200H direct communication, there are
no restrictions on the order in which power supplies are switched ON and OFF.

Noise prevention
The NT600S has a noise preventive feature against the power supply line noise.
To further reduce noise, connect a noise filter to the power line. This will drasti-
cally reduce the ground noise.

Power supply
In order to comply with EC directives, use a SELV power supply.
Applicable power supply specifications are as follows.
Item
Power supply voltage
Allowable power supply
voltage fluctuation range
Power supply capacity

Parts used for connection
For the connection to the power supply terminal block, twisted wires of 2 mm
greater cross sectional area and M 3.5 size crimp terminals must be used.
Use crimp terminals to connect the power supply to the power input terminals.
Recommended crimp terminals for M3.5 are given below.
Tighten the screws on the terminal block to a torque of 0.8 N·m.
Breaker
24 VDC Power Supply
Value
24 VDC
20.4 VDC to 26.4 VDC
(24 VDC --15%, +10%)


ST121(B)-EV 15W over
Section 2-2


ST211(B)-EV 25W over
2
or