Delta AH500 Hardware Operation Manual page 230

4.8.2.2 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, the time
constant t(L/R)), and the current passing through the terminal. The relation is shown in the life cycle curve
below.

Relay output circuit
①
Direct-current power supply
②
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
③
connected to the common terminal.
④
Alternating-current power supply
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)
C h a p t e r 4 I n s t a l l i n g H a r d wa r e a n d W i r i n g
ψ = 0.4)
ψ
0.7 1 2
4 - 6 3