Mitsubishi FX3UC Series, Руководство пользователя

Страница: 395 / 458

389
FX
3UC
Series Programmable Controllers
User’s Manual - Hardware Edition
12 Test Operation, Adjustment, Maintenance and Troubleshooting
12.4 Maintenance
11
Mem
ory
Cass
ette/B
attery
12
Te
st
R
un,
M
aint
enanc
e,
Troubleshoot
ing
A
Ve
rs
ion
In
fo
rm
atio
n
B
Per
for
m
ance
Specif
icati
ons
C
S
pec
ia
l D
evices
(M80
00 -,
D
800
0 -)
D
In
str
uct
ion List
E
C
har
ac
te
r-code
F
D
isconti
nued
m
odels
12.4 Maintenance
12.4.1 Periodic inspection
Consumable components resulting in a shorter product life are not built in this PLC. However, the following
components have a limited life.
Standard life of FX
3U
-32BL: 5 years (at ambient temperature of 25
°
C (77
°
F ))
[Free guarantee period: 1 year after delivery or up to 18 months after manufacture]
→
For frequency of replacement, refer to Subsection 11.5.4.
• Check that the temperature in the panel is not abnormally increased by other heat generating bodies or
direct sunlight.
• Check that dust or conductive dust has not entered the panel.
• Check for loosening of wiring and other abnormalities.
12.4.2 Product life of relay contacts
The product life of relay contacts varies considerably 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.
1) Input/output extension blocks
→
For the applicable models, refer to Subsection 1.4.2.
The standard life of contacts used for Inductive loads, such as contactors and solenoid valves, is 500,000
operations at 20 VA.
The following table shows the approximate life of a relay based on the results of an operation life test.
Test condition: 1 sec. ON/1 sec. OFF
Part Life
Model FX
3U
-32BL battery
Standard life: 5 years (at ambient temperature of 25
°
C (77
°
F))
[Guarantee for 1 year]
Load capacity Contact life
20VA
0.2A/100V AC
3,000,000 times
0.1A/200V AC
35VA
0.35A/100V AC
1,000,000 times
0.17A/200V AC
80VA
0.8A/100V AC
200,000 times
0.4A/200V AC