Delta AH500 series Manual Page 198

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Chapter 5 Wiring
5-40
5.5.2.2 Relay Output Circuit
Relay terminals have no polarity. They can be applied to alternating current which passes through a load, or
direct current which passes through a load. The maximum current which can passes through every relay
terminal is 2 A, and the maximum current which can passes through every common terminal is 5 A. The lifetime
of a relay terminal varies with the working voltage, the load type (the power factor cosψ), and the current
passing through the terminal. The relation is shown in the life cycle curve below.
Contact Current(A)
20
0.5
0.1
0.2
30
50
0.3 0.7
12
200
300
500
100
1000
2000
3000
O
p
e
r
a
t
i
o
n
(
X
1
0
)
3
120VAC Resistive
30VDC Inductive(t=7ms)
240VAC Inductive(cos 0.4)
ψ
=
120VAC Inductive(cos =0.4)
ψ
30VDC
Inductive
(t=40ms)
Relay output circuit
Direct-current power supply
Emergency stop: An external switch is used.
Fuse: To protect the output circuit, a fuse having a breaking capacity in the range of 5 A to 10 A is
connected to the common terminal.
Alternating-current power supply
A relay or a solenoid valve is used as a DC load. A diode is connected in parallel to absorb the surge
voltage which occurs when the load is OFF.
V DC power supply
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