Life Of Relay Output Contact; Example Of Relay Output Wiring; Cautions In External Wiring; Transistor Output Specifications - Mitsubishi Electric FX3U-128M series Hardware Manual
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- Startup and maintenance precautions (2 pages) ,
- Programming manual (948 pages) ,
- User manual (532 pages)
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*
(
1) Each value inside ( ) indicates the number of occupied points.
*
(
2) The total load current of resistance loads per common
terminal should be the following value.
-
1 output point/common terminal: 2 A or less
-
4 output points/common terminal: 8 A or less
-
8 output points/common terminal: 8 A or less
As for the number of outputs per common terminal, refer to
“Chapter 4 interpretation of partition” and the following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
3.5.2
Life of relay output contact
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 standard life of the contact used for Inductive loads, such as
contactors and solenoid valves, is 500 thousand operations at
20 VA.
The following table shows the approximate life of the relay based
on the results of our operation life test.
Test condition: 1 sec.ON / 1 sec.OFF.
Load capacity
Contact life
0.2 A/100 V AC
20 VA
3 million times
0.1 A/200 V AC
0.35 A/100 V AC
35 VA
1 million times
0.17 A/200 V AC
0.8 A/100 V AC
2 hundred thousand
80 VA
times
0.4 A/200 V AC
The product life of relay contacts becomes considerably shorter
than the above conditions when the rush overcurrent is shut
down.
For countermeasures while using inductive loads,
refer to Subsection 3.5.4.
Some types of inductive loads generate rush current 5 to 15 times
the stationary current at activation. Make sure that the rush
current does not exceed the current corresponding to the
maximum specified resistance load.
2) Lamp load
Lamp loads generally generate rush current 10 to 15 times the
stationary current. Make sure that the rush current does not
exceed the current corresponding to the maximum specified
resistance load.
3) Capacitive load
Capacitive loads can generate rush current 20 to 40 times the
stationary current. Make sure that the rush current does not
exceed the current corresponding to the maximum specified
resistance load. Capacitive loads such as capacitors may be
present in electronic circuit loads including inverters.
For the maximum specified resistance load,
refer to Subsection 3.5.1.
3.5.3
Example of relay output wiring
Load
Y000
Y001
Fuse
COM1
24 V DC
Load
Y010
Y011
Fuse
COM2
PLC
100 V AC
3.5.4
Cautions in external wiring
For cautions in external wiring, refer to the following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
Protection circuit for load short-circuiting
When a load connected to the output terminal short-circuits, the
printed circuit board may be burnt out. Fit a protective fuse on the
output circuit.
Protection circuit of contact when inductive load is used
An internal protection circuit for the relays is not provided for the
relay output circuit. It is recommended to use inductive loads with
built-in protection circuits. When using loads without built-in
protection circuits, insert an external contact protection circuit, etc.
to reduce noise and extend the product life.
1) DC circuit
Connect a diode in parallel with the load.
U s e a d i o d e ( f o r c o m m u t a t i o n ) h a v i n g t h e f o l l o w i n g
specifications.
Item
Standard
Reverse voltage
5 to 10 times the load voltage
Forward current
Load current or more
2) AC circuit
Connect the surge absorber (combined CR components such as
a surge killer and spark killer, etc.) parallel to the load.
Select the rated voltage of the surge absorber suitable to the
output used. Refer to the table below for other specifications.
Item
Standard
Approx. 0.1 F
Electrostatic capacity
Approx. 100 to 200
Resistance value
Interlock
Loads, such as contactors for normal and reverse rotations, that
must not be turned on simultaneously should have an interlock in the
PLC program and an external interlock.
Common mode
Use output contacts of the PLC in the common mode.
3.6
Transistor output specifications and example of
external wiring
As for the details of the transistor output specifications and external
wiring, refer to the following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
3.6.1
Transistor output specifications
Item
Specification
FX
-16MT/,
3U
8 points
FX
-8EYT
2N
FX
-32MT/,
3U
FX
-32ET,
16 points
2N
Number
FX
-16EYT
2N
of
FX
-48MT/,
3U
output
24 points
FX
-48ET
2N
points
FX
-64MT/
32 points
3U
FX
-80MT/
40 points
3U
FX
-128MT/ES(S)
64 points
3U
Refer to FX
Series
3U
Output connecting type
User's Manual -
Hardware Edition
FX
-MT/S(-A),
3U
FX
-ET,
2N
FX
-48ET-D,
Transistor (Sink)
2N
FX
-EYT,
2N
Output
FX
-8EYT-H
2N
form
FX
-MT/SS,
3U
FX
-ET-ESS/UL,
2N
Transistor (Source)
FX
-48ET-DSS,
2N
FX
-EYT-ESS/UL
2N
External power supply
5-30 V DC
FX
-MT/,
3U
FX
-ET,
2N
*
0.5 A/point (
1)
FX
-ET-,
2N
Resis
FX
-EYT,
2N
tance
FX
-EYT-ESS/UL
2N
load
*
1 A/point (
2)
FX
-8EYT-H
2N
*
0.3 A/point (
3)
FX
-16EYT-C
2N
Max.
load
FX
-MT/,
3U
FX
-ET,
2N
*
12 W/24 V DC (
4)
FX
-ET-,
2N
Induc
FX
-EYT,
2N
tive
FX
-EYT-ESS/UL
2N
load
*
24 W/24 V DC (
5)
FX
-8EYT-H
2N
*
7.2 W/24 V DC (
6)
FX
-16EYT-C
2N
Min. load
-
Open circuit leakage current
0.1 mA or less/30 V DC
ON voltage
1.5 V or less
Item
Specification
5 s or less/10 mA
Y000 to
Y002
or more (5-24 V DC)
Main unit
OFF
Y003 or
0.2 ms or less/200 mA
more
or more (at 24 V DC)
ON
Input/output extension
0.2 ms or less/200 mA
*
units/blocks (
7)
or more (at 24 V DC)
Response
time
5 s or less/10 mA
Y000 to
Y002
or more (5-24 V DC)
Main unit
ON
Y003 or
0.2 ms or less/200 mA
more
or more (at 24 V DC)
OFF
Input/output extension
0.2 ms or less/200 mA
*
units/blocks (
7)
or more (at 24 V DC)
Output circuit insulation
Photocoupler insulation
LED on panel lights when
Output operation display
photocoupler is driven.
*
(
1) The total load current of resistance loads per common
terminal should be the following value.
-
1 output point/common terminal: 0.5 A or less
-
4 output points/common terminal: 0.8 A or less
-
8 output points/common terminal: 1.6 A or less
As for the number of outputs per common terminal, refer to
“Chapter 4 interpretation of partition” and the following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
*
(
2) The total load current of resistance loads per common
terminal should be the following value.
-
4 output points/common terminal: 2 A or less
As for the number of outputs per common terminal, refer to the
following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
*
(
3) The total load current of resistance loads per common
terminal should be the following value.
-
16 output point/common terminal: 1.6 A or less
As for the number of outputs per common terminal, refer to the
following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
*
(
4) The total of inductive loads per common terminal should be
the following value.
-
1 output point/common terminal: 12 W or less/24 V DC
-
4 output points/common terminal: 19.2 W or less/24 V DC
-
8 output points/common terminal: 38.4 W or less/24 V DC
As for the number of outputs per common terminal, refer to
“Chapter 4 interpretation of partition” and the following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
*
(
5) The total of inductive loads per common terminal should be
the following value.
-
4 output points/common terminal: 48 W or less/24 V DC
As for the number of outputs per common terminal, refer to the
following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
*
(
6) The total of inductive loads per common terminal should be
the following value.
-
16 output points/common terminal: 38.4 W or less
As for the number of outputs per common terminal, refer to the
following manual.
Refer to FX
Series User's Manual - Hardware Edition.
3U
*
(
7) The response time is as follows in the FX
-8EYT-H.
2N
-
OFFON: 0.2 ms or less/1 A
-
ONOFF: 0.4 ms or less/1 A
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