Mitsubishi Electric FX3U-232ADP User Manual page 7

*3 The total load current of resistance loads per common terminal
should be the following value or less.
- 1 output point/common terminal : 2A
- 4 output points/common terminal : 8A
- 8 output points/common terminal : 8A
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.
3G
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 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
20VA.
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
0.2A/100V AC
20VA 3 million times
0.1A/200V AC
0.35A/100V AC
35VA 1 million times
0.17A/200V AC
0.8A/100V AC
80VA 2 hundred thousand times
0.4A/200V 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
Y0
DC power
supply
Fuse
COM0
Load
Y1
AC power
supply
Fuse
COM1
PLC
3.5.4 Cautions in external wiring
As for the details of Instructions for connecting input devices, refer to
the following manual.
→ Refer to FX Series User's Manual - Hardware Edition.
3G
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 in this product. 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.
Use a diode (for commutation) having the following
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
Electrostatic capacity Approx. 0.1μF
Approx. 100 to 200Ω
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
3G Series User's Manual - Hardware Edition.
3.6.1 Transistor output specifications
Item Specification
FX -14MT 6 points (8 points)
3G
FX -8EYT 8 points
2N
Number FX -24MT 10 points (16 points)
3G
of
FX -40MT ,
3G
output
FX -32ET , 16 points
2N
points
FX -16EYT
2N
FX -60MT ,
3G
24 points
FX -48ET
2N
Refer to FX 3G Series
Output connecting type User's Manual
- Hardware Edition
FX - MT/ES(-A),
3G
FX - MT/DS,
3G
FX - ET,
2N
Transistor(Sink)
FX 2N -48ET-D,
FX - EYT,
2N
Output
FX -8EYT-H
2N
form
FX - MT/ SS
3G
FX 2N - ET-ESS/UL,
Transistor(Source)
FX -48ET-DSS,
2N
FX - EYT-ESS/UL
2N
External power supply 5 to 30V DC
FX - MT ,
3G
FX - ET,
2N
FX - ET- , *2
2N
0.5A/point
Resist
FX - EYT,
2N
ance
FX - EYT-ESS/UL
2N
load
*3
FX -8EYT-H
2N 1A/point
*2
FX -16EYT-C
2N 0.3A/point
Max.
load
FX - MT ,
3G
FX - ET,
2N
FX - ET- , *4
2N 12W/24V DC
Induct
FX - EYT,
2N
ive
FX - EYT-ESS/UL
2N
load
*3
FX -8EYT-H
2N 24W/24V DC
*4
FX -16EYT-C
2N 7.2W/24V DC
−
Min. load
Open circuit leakage current 0.1mA or less/30V DC
ON voltage 1.5V or less
Item
Y000,
FX -
3G
Y001
14MT ,
FX -
3G
Y002 or
24MT
more
OFF
Y000 to
FX -
3G
→
Y002
40MT ,
ON
FX -
3G
Y003 or
60MT
more
*1
Input/output extension
units/blocks
Respon
se time
*1
Y000,
FX -
3G
Y001
14MT ,
FX -
3G
Y002 or
24MT
more
ON
Y000 to
FX -
→ 3G
Y002
40MT ,
OFF
FX -
3G
Y003 or
60MT
more
Input/output extension
units/blocks
Circuit insulation
Display of output operation
*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 or less.
- 4 output points/common terminal : 0.8A
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.
3G
*3 The response time is as follows in the FX
- OFF→ON : 0.2ms or less/1A
- ON→OFF : 0.4ms or less/1A
*4 The total of inductive loads per common terminal should be the
following value or less.
- 1 output point/common terminal : 12W/24V DC
- 4 output points/common terminal : 19.2W/24V 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.
3G
3.6.2 External Wiring of Transistor Output
1. External Wiring of Sink Output Type
Load
Y0
DC power
Fuse
supply
COM0
Load
Y1
DC power
Fuse
supply
COM1
Specification
5μs or less/10mA or more
(5 to 24V DC)
0.2ms or less/200mA
or more (at 24V DC)
5μs or less/10mA or more
(5 to 24V DC)
0.2ms or less/200mA
or more (at 24V DC)
0.2ms or less/200mA
or more (at 24V DC)
5μs or less/10mA or more
(5 to 24V DC)
0.2ms or less/200mA
or more (at 24V DC)
5μs or less/10mA or more
(5 to 24V DC)
0.2ms or less/200mA
or more (at 24V DC)
0.2ms or less/200mA
or more (at 24V DC)
Photocoupler insulation
LED on panel lights when
photocoupler is driven.
-8EYT-H
2N
PLC