Festo MH2 Serie Breves Instr. De Funcionamiento página 2

Solenoid valve/Valve terminal
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MH...2, MH...3, MH...4
This product is Recognized by Underwriters Laboratories
Inc. as a component. Representative samples of this com-
ponent have been evaluated by UL and meet applicable
UL requirements.
Component Recognition information
Product category code YIOZ2 (USA) or
YIOZ8 (Canada)
File number MH19482
Considered standards UL 429, 5th edition,
C22.2 No. 139-1982
Please note
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Fitting and commissioning to be carried out by qualified
personnel only in accordance with the operating in-
structions.
Such qualified personnel must have several years of
training and experience in installing and commissioning
electrical and pneumatic industrial control systems.
• Please observe the applicable safety requirements
and standards.
Extracts )* from the UL report:
Only for use in Class 2 Circuits
Uniquement pour utilisation en circuits de Classe 2
This device is intended to be used with a Class 2 power
source or Class 2 transformer in accordance with UL1310
or UL1585.
As an alternative a LV/C (Limited Voltage/Current) power
source with one of the following properties can be used:
– This device shall be used with a suitable isolating
source such that the maximum open circuit voltage
potential available to the product is not more than
24 Vdc and the current is limited to a value not excee-
ding 8 amperes measured after 1 minute of operation.
– This device shall be used with a suitable isolating
source in conjunction with a fuse in accordance with
UL248. The fuse shall be rated max. 4 A and be installed
in the 24 Vdc power supply to the device in order to
limit the available current.
Note that, when more than one power supply or isolating
device is used, connection in parallel is not permitted.
Conditions of acceptability
In determining the acceptability of the combination, the
following details should be examined:
– The valves are supplied from an NEC Class 2 source and
the need for any additional enclosure is to be determi-
ned in the end-use application.
Also see last item below.
en
– The valve terminals are suitable for factory-wiring only.
– The suitability of any mating electrical connector is to
be determined in the end product.
– The valves are suitable for air, inert gas or vacuum only.
– The valves are intended to be used in conjunction with
air tubes with the following outside dimensions:
Port Air tube Size thread
[mm]
1/33 4 or 8 M7
3/11 4 or 8 M7
6 G1/8
2 3 or 4 or 6 M5
– The Low Temperature Impact Test was not performed.
These valves are to be mounted in a suitably guarded or
protected location to avoid contact (impact) in the end-
use product application.
)* taken over essentially without important changes
Torque
[Nm]
2
2
3
0.8