Relay Output Circuit - Delta AH500 series Hardware Manual

AH5 00 Hardw are Manu al
3. The TRIAC output

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.

The relay output circuit
Direct-current power supply
①
Emergency stop: An external switch is used.
②
Fuse: To protect the output circuit, a fuse having a breaking capacity within the range
③
between 5 A and 10 A is connected to the common terminal.
Alternating-current power supply
④
Load through which the
alternating current flows
120VAC Resistive
3000
30VDC Inductive(t=7ms)
2000
240VAC Inductive(cos
1000
120VAC Inductive(cos =0.4)
500
300
200
100
30VDC
Inductive
50
(t=40ms)
30
20
0.1
0.2 0.3 0.5
Contact Current(A)
= 0.4)
ψ
ψ
0.7 1 2
5 - 2 5