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Dimension for actuator elements
Switch- and potentiometer actuator *
*
not yet certified for category II D
Glass for measuring instrument AM/VM45
Glass for measuring instrument AM/VM72
X = fixing dimensions
1
2
Fig. 1
4
Field of application
The control units are intended for use in
potentially explosive atmospheres in zones 1,
2 as well as in Zones 21 and 22 in accordance
with IEC 79-10.
The enclosure materials used, including any
external metal parts, are high quality materials
that ensure a corrosion resistance and
resistance to chemical substances according
to the requirements for use in a "normal
industrial atmosphere"
- impact resistant polyamide
- special steel AISI 316 L.
When used in extremely aggressive
atmospheres, the additional data relating to
the chemical resistance of the plastics being
used shall be taken from the data sheet
GHG 902 4001 P0001.
10
10
10
10
10
COOPER Crouse-Hinds GmbH
Explosion-protected control units GHG 411 / 412
5
Application / Properties
The control units GHG 411 and 412 are
intended for the local control of electrical
installations in potentially explosive
atmospheres. The units are fitted with built-in
components according to the respective
application.
Specially marked special versions of the
control units can be used in "intrinsically safe
circuits".
The electrical limiting values that are decisive
for the intrinsic safety shall be observed.
The version with gold-tipped contacts is
suited for switching extra-low voltage circuits.
Special attention shall be paid to the
maximum current load (see technical data,
pages 8 and 9). The contact chamber of the
gold-tipped version is marked with the letter
"G" or colour-coded.
To ensure a safe and reliable disconnection,
the normally closed contacts are designed as
compulsory opening contacts.
Where required, the bases are fitted with
0.6 W resistors, fine-wire fuses and diodes
(max. power dissipation 1 W).
The measuring instruments are used for the
local indication of electrical values. See
"Technical Data" for details of measuring
mechanism, accuracy and connection.
When the switch collar of small control
switches is cut out at the respective locking
position, they can be padlocked (padlock
shackle Ø up to 5mm).
With measuring instruments AM/VM72 and
AM/VM45 for c.t. connection n/1A (Fig. 1, item
2) the interchangeable scales can be
exchanged via a flap on the upper part of the
measuring instrument (Fig. 1, item 1).
The data according to sections 3 and 4
shall be taken into account during use.
Applications other than those described are
not permissible without a written
declaration of consent from Messrs.
COOPER Crouse-Hinds.
During operation the instructions stated in
section 7 of the operating instructions shall
be observed.
The sole responsibility with respect to the
suitability and proper use of the control
switches with regard to the basic
requirements of these instructions (see
technical data) lies with the operator.
6
Installation
The relevant national regulations (e.g. Betr.Si.V,
the equipment safety law for Germany) and the
generally recognized rules of engineering apply
for the installation and operation.
The improper installation and operation of
control switches may result in the
invalidation of the guarantee.
6.1
Mounting
The control units GHG 411 can be mounted
without opening the enclosure.
When the control units are mounted directly
onto the wall, they shall rest evenly only on
the fastening points provided for this purpose.
The screw chosen shall fit the fixing hole (see
dimensional drawings, page 9) and shall not
damage the hole (e.g. use of a washer).
The apparatus shall be fixed diagonally with a
minimum of 2 screws.
If the screws are overtightened, the
apparatus may be damaged.
The control units GHG 411 and GHG 412 are
suited for mounting on CEAG apparatus
holders by means of self-cutting screws (see
pages 13 and 14).
See the respective mounting instructions.
The control units GHG 412 can be mounted in
the flange openings provided for this purpose
(see page 8).
Here special attention shall be paid to an even
sealing surface and the perfect condition of
the seal that is foamed into the enclosure
cover of the control unit.
The control unit is mounted in the flange
opening by means of fixing lugs that engage
behind the flange opening.
These are actuated by turning the 2 fixing
screws on the front of the enclosure cover
clockwise.
6.2
Opening apparatus/
Electrical connection
Before opening the apparatus, it is
necessary to ensure that there is no voltage
or to take suitable protective measures.
The electrical connection of the may only
be carried out by specialists.
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