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017A/ENGD-#S-TFI95GB
Installation and Maintenance Manual
Solid State Auto-Switch Series D-H7A1, D-H7A2,
D-H7BA, D-H7B, D-H7BW, D-H7NW, D-H7PW
For future reference, please keep this manual in a safe place
This manual should be read in conjunction with the current product catalogue
Safety Instructions
2. Only trained personnel should operate pneumatically
operated machinery and equipment.
These safety instructions are intended to prevent a hazardous situa-
Compressed air can be dangerous if an operator is unfamiliar
tion and/or equipment damage. These instructions indicate the level
with it. Assembly, handling or repair of pneumatic systems should
of potential hazard by label of "Caution", "Warning" or "Danger".
be performed by trained and experienced operators.
To ensure safety, be sure to observe ISO4414
(Note1)
, JIS B 8370
(Note2)
and other safety practices.
3. Do not service machinery/equipment or attempt to
Note 1: ISO 4414: Pneumatic fluid power – Recommendations for the
remove component until safety is confirmed.
application of equipment to transmission and control systems.
1) Inspection and maintenance of machinery/equipment should
Note 2: JIS B 8370: Pneumatic system axiom.
only be performed after confirmation of safe locked-out
control positions.
CAUTION :
2) When equipment is to be removed, confirm the safety process
Operator error could result in injury or
as mentioned above. Switch off air and electrical supplies and
equipment damage.
exhaust all residual compressed air in the system.
3) Before machinery/equipment is re-started, ensure all safety
WARNING :
Operator error could result in serious
measures to prevent sudden movement of cylinders etc.
injury or loss of life.
(Bleed air into the system gradually to create back-pressure,
i.e. incorporate a soft-start valve).
DANGER :
In extreme conditions, there is a
possible result of serious injury or loss of life.
4. Contact SMC if the product is to be used in any of the
following conditions:
1) Conditions and environments beyond the given specifica-
WARNING
tions, or if product is used outdoors.
2) Installations in conjunction with atomic energy, railway, air
1. The compatibility of pneumatic equipment is the respon-
navigation, vehicles, medical equipment, food and beverage,
sibility of the person who designs the pneumatic system
recreation equipment, emergency stop circuits, press
or decides its specifications.
applications, or safety equipment.
Since the products specified here are used in various operating
3) An application which has the possibility of having negative
conditions, their compatibility for the specific pneumatic system
effects on people, property, or animals, requiring special
must be based on specifications or after analysis and/or tests to
safety analysis.
meet your specific requirements.
CAUTION
Ensure that the air supply system is filtered to 5 micron.
1. Product specification
Model number
D-H7A1
D-H7NW
D-H7A2
Wiring style
Three wire type
Output style
NPN type
PNP type
Application
IC, Relay, PLC
Source voltage
DC5·12·24V (DC4.5~28V)
Current consumption
10mA or less
Load voltage
DC28V or less
––
Load current
40mA or less
80mA or less
Internal voltage drop
1.5V or less
0.8V or less
Leak current
100µA or less at DC24V
Operating time
1ms or less
Operating
One colour
Two colour
One colour
indicator lamp*
Proof impact
1000m/s
50M Ω or more at DC500V mega
Insulation resistance
Proof voltage
AC1000V for 1 minute (lead wire, between cases)
Ambient temperature
-10~60°C
Protection structure
IEC529 standard IP67, JISC0920
*
One colour: Red diode lights when ON
Two colour: Operating position······Red diode lights
Optimum operating position······Green diode lights
Installation
lowing conditions before operation, and note that the internal voltage
drop and leak current have a considerable influence on the serial and
Actuators
parallel connection of the 2-wire solid state switch.
WARNING
Leak current influence
I.E Voltage generated to the load when the power is turned off.
To eliminate the possibility of magnetic interference between switch-
es, please ensure that, when two or more actuators are used, in
Voltage generated = Auto-switch leak current x load resistance. If this
parallel, they are kept at least 40mm apart.
voltage exceeds the OFF voltage of the load, it is possible that the load
may stay ON. In order to match the condition of the controller-input
Mid-stoke position sensing
unit and leak current, then auto-switch leak current must be less than
Exercise caution when attempting to detect the piston at mid-position,
input unit OFF current.
without stopping, as the switch detection time may be too short,
particularly at relatively high actuator speeds. Detectable max. piston
Internal voltage drop
speed can be obtained by the following formula:
Should an internal voltage drop occur, then the load supply voltage
will also drop as the switch operates. (Load supply voltage = Source
V (mm/s) = Auto switch operating range (mm)
voltage – Internal voltage drop).
Load operating time (m/s)
When the load supply voltage becomes lower than the switch ON
voltage, the load may not operate correctly.
Where possible keep all wiring as short as possible.
WARNING
CAUTION
Incorrect load voltage
If the 2-wire type solid state auto-switch has a large internal voltage
Although the switch will operate correctly, even if the load current is
drop, and leakage current is also high, it is possible that the load may
below the limit of the specification, the indicator light will be
not operate correctly due to incorrect load spec. Please confirm the fol-
'dimmed'. If the load current falls to 3mA, or lower, the operation may
Problem
Condition
Stay OFF
(sometimes ON)
Indicator
lamp lights
Normal
2 wires/
3 wires
3 wires
Wiring
(output) check
Normal
Abnormal
A
Load spec. check
Load spec. check
D-H7BW
D-H7PW
D-H7B
D-H7BA
A
. . .Switch output parts failure (replace)
Two wire type
B
. . .Correct wiring
––
24V DC Relay, PLC
C
. . .Replace switch 2 wires
––
––
Fig 1
DC24V (DC10~28V)
5~40mA or less
4V or less
not start.
0.8mA or less at DC24V
Ensure that, if using a load that can generate a surge voltage ie. Relay
or Solenoid valve, a built-in surge protection circuit is installed.
Two colour
One colour
Two colour
If an auto-switch is to be used to generate an inter-lock signal, which
2
requires high reliability, then instigate mechanical protection, or place
another switch, double inter-lock style, together. Ensure the correct
operation of this Inter-lock frequently.
Ensure, when installing this product, that enough space is
available for maintenance to be carried out.
CAUTION
Do not subject this product to any form of impact damage.
Do not lift an actuator, fitted with an auto-switch, by the switch lead,
as stress may be applied to the inside of the switch.
Ensure auto-switch mounting screw is tightened to the correct torque
(see Mounting of switch bracket).
Adjust the auto-switch so that the ON position coincides with the cen-
tre of the operating area. If the switch is set to one side or the other
of this centre position then inconsistent operation will occur.
Wiring
Do not apply repeated bending or tensile forces to the
connecting wiring as this may cause disconnection. Bend radius is
approximately R40mm or more.
Connect the load before applying power to the switch, failure to do so
may cause excess current to damage the switch.
Ensure wiring is carried out correctly. Not all wiring modes have pro-
tection and the switch may be damaged.
Separate signal lines from power/high voltage lines to prevent 'noise'.
Ensure all wiring is correctly and fully insulated.
WARNING
DO NOT USE THIS SWITCH IN AN EXPLOSIVE ATMOSPHERE.
Do not use this switch in high magnetic fields, as this will damage the
switch and actuator magnet.
Do not use this switch in water-laden atmospheres, oil or chemical
laden atmospheres.
Stay ON
(sometimes OFF)
Indicator
lamp lights
Stay OFF
Normal
Stay OFF
Source voltage
2 wires/
or load voltage
3 wires
Normal
Abnormal
3 wires
2 wires
2 wires
Load spec.
Replace the
Load spec.
check
switch
check
Normal
Abnormal
Normal
Abnormal
Normal
B
A
C
D
E
B
B
A
. . .ON voltage > Load voltage - Internal voltage drop
. . .OFF current > Leak current
. . . .Switch failure
D
E
. . . .Replace cylinder. Detectable magnet field inadequate (No magnet)
3 wires
. . . .Replace PLC input board or replace switch 2 wire
F
Do not use this switch in conditions where temperatures are outside
of the switch operating Spec.
Protect the switch from weld spatter and accumulation of iron dust etc.
Maintenance
To avoid incorrect operation periodic maintenance should be carried out.
•
Check tightness of mounting screw regularly to prevent possible
movement of the switch from its set position.
•
Regularly check condition of the wiring. Repair insulation damage
immediately or replace the switch.
•
If a red LED is showing this indicates that the switch has moved
from the set position. Re-adjust the switch until the green LED is
showing (this is the optimum position).
CAUTION
If detection failure occurs i.e. LED remains ON follow the faultfinding
chart above (Fig 1).
For applications involving contact with water, elasticity, and welding,
contact your nearest SMC Office. (See at the end of this Manual.)
If the hysteresis, between the ON and OFF position of the switch is
incorrect please consult SMC.
Hysteresis
Piston moving
ON position
direction
Piston moving
direction
OFF position
Fig 2
3 wire type NPN output
DC(+)
Brown (Red)
OUT
Switch
Load
Black (White)
DC(-)
Blue (Black)
2 wire type (Sink output)
Stay ON
OUT(+)
Load
Brown (Red)
Switch
Power
source
OUT(-)
Blue (Black)
Fig 4
Exterior dimensions
D-H7A1/H7A2/H7B
Indicator lamp
Abnormal
9
29
4. 6
4. 3
ø3. 5
A
F
D
10. 5
Most sensitive position
D-H7BW/H7NW/H7PW/H7BA
3 wires
Indicator lamp
9
29
4. 6
ø3. 5
4. 3
Fig 3
Basic wiring (Fig 4)
Lead wire colour in brackets indicates products complying with IEC.
Connection with PLC (sequence controller)
Depending on the PLC input specification, the output design of 3 wire
type switches and 2 wire type switches differ. (See below)
PLC input specification
3 wire output type
Sink input
NPN output
Source input
PNP output
Mounting of switch bracket
Hysteresis
Each actuator has a specified mounting bracket to mount the switch
to the actuator. The type of bracket depends on the following:
•
Type of actuator, and tube O.D. Please consult the current
actuator catalogue for details.
When fitting an auto-switch for the first time please ensure that the
actuator is fitted with a magnet and that the brackets are correct for
the actuator type.
3 wire type PNP output
DC(+)
Brown (Red)
OUT
Load
Switch
Power
Power
Black (White)
source
source
DC(-)
Blue (Black)
2 wire type (Source output)
OUT(+)
Power
Brown (Red)
source
Switch
OUT(-)
Load
Blue (Black)
Appropriate tightening torque
Autoswitch
Autoswitch set screw
M3X0. 5x14l
Autoswitch mounting band
(with bracket)
Fig 5
M3 mounting screw correct tightening torque is 0.8~1.0 Nm
(8.2~10.2
kgf.cm)S
Setting the switch detection position
Position the actuator at its stroke end.
Single colour display
Move the auto-switch into the centre of the operating range and
ensure that the red LED is ON.
Two colour display
Move the Auto-switch into the centre of the operating range and
ensure that the green LED is ON.
ON
OFF
Green
Red
Red
Operating range
Fig 6
Detecting actuator stroke end
Refer to dimensions A & B in the actuator catalogue.
CAUTION
D-H7BA (Improved water resistant type)
Although this switch has improved properties with regard to oil and
water resistance, it should not be exposed to cutting oil, which con-
tains additives, high-pressure water jets or extremes of temperature.
CAUTION
2 wire connecting type
In all cases do not clean with a solvent solution.
Sink output mode
When you enquire about the product, please contact the following
Source output mode
SMC Corporation:
ENGLAND
Phone 01908-563888
TURKEY
Phone 212-2211512
ITALY
Phone 02-92711
GERMANY
Phone 6103-402-0
HOLLAND
Phone 020-5318888
FRANCE
Phone 01-64-76-10-00
SWITZERLAND Phone 052-34-0022
SWEDEN
Phone 08-603 07 00
SPAIN
Phone 945-184100
AUSTRIA
Phone 02262-62-280
Phone 902-255255
IRELAND
Phone 01-4501822
GREECE
Phone 01-3426076
DENMARK
Phone 8738-0800
FINLAND
Phone 09-68 10 21
NORWAY
Phone 67-12 90 20
BELGIUM
Phone 03-3551464
POLAND
Phone 48-22-6131847
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