FX2NC Series Programmable Controllers
Outputs 6.
6-7
6.2.1
Product life of relay contacts
The product life of relay contacts considerably varies depending on the load type used. Take
care that loads generating reverse electromotive force or rush current may cause poor contact
or deposition of contacts which may lead to considerable reduction of the contact product life.
1) Inductive load
Inductive loads generate large reverse electromotive force between contacts at shutdown
which may cause arcing. At a fixed current consumption, as the power factor (phase
between current and voltage) gets smaller, the arc energy gets larger.
The test results in table 6.5 were gathered from a 1 sec ON/OFF test cycle.
Please note that the over current induced by in-rush greatly reduces the relay contacts life.
The rated life for an inductive AC load such as a contactor or solenoid valve is 500,000
operations at 20VA.
Summary of Contents for MELSEC FX2NC-16MT-D/UL
Page 1: ...D UL HARDWARE MANUAL FX2NC D UL SERIES PROGRAMMABLE CONTROLLERS ...
Page 12: ...FX2NC Series Programmable Controllers Introduction 1 ...
Page 40: ...FX2NC Series Programmable Controllers Introduction 1 1 28 MEMO ...
Page 42: ...FX2NC Series Programmable Controllers Terminal layouts 2 ...
Page 48: ...FX2NC Series Programmable Controllers Installation notes 3 ...
Page 70: ...FX2NC Series Programmable Controllers Power supply 4 ...
Page 78: ...FX2NC Series Programmable Controllers Inputs 5 ...
Page 88: ...FX2NC Series Programmable Controllers Inputs 5 5 10 MEMO ...
Page 90: ...FX2NC Series Programmable Controllers Outputs 6 ...
Page 108: ...FX2NC Series Programmable Controllers Outputs 6 6 18 MEMO ...
Page 110: ...FX2NC Series Programmable Controllers Diagnostics 7 ...
Page 126: ...FX2NC Series Programmable Controllers Diagnostics 7 7 16 MEMO ...
Page 128: ...FX2NC Series Programmable Controllers Diagnostics 8 ...
Page 130: ...FX2NC Series Programmable Controllers Discontinued model 8 8 2 MEMO ...
Page 131: ......