Delta Controls 721 - Manual (Page 2)

Low Voltage Directive (LVD) – 2006/95/AC. Switch products with enclosure codes ‘W’ and
‘A’ supplied CE-marked must be installed and used in accordance with the main instructions
and this addendum supplied with each product. Products rated lower than 50V ac and 75 V dc
are outside the scope of the LVD, and therefore, do not require CE-marking under this
directive. The LVD does not apply to products with enclosure codes ‘H’, ‘K’, ‘R’, ‘M’, ‘N’ for use
in hazardous areas. Switch products with enclosure codes ‘H’, ‘K’, ‘R’, ‘M’, ‘N’, are covered by
the Explosive Atmospheres Directive ATEX – 94/9/EC and when CE-marked will indicate
compliance with this directive alone. The following directives do not apply to switch products
manufactured by Delta Controls:
Electromagnetic Compatibility EMC – 2004/108/EC
Machinery Safety Directive MSD – 2006/42/EC
WIRING
ENCLOSURE ‘W’
Cable Glands and adaptors – If enclosure ‘W’ is supplied with a through hole of 22 mm
blanked with a blind grommet. Discard the grommet and fit a suitable proprietary brass or
nylon M20 cable gland with thread length of 10 mm and locknut. Fit the nylon reducer provided
to the inside and a fibre washer to the outside. See diagram 1.
Alternately, the enclosure may be supplied from the factory with a threaded adaptor ready to
accept the customer’s gland or conduit system.
Alternatives:
i) a metal or nylon adaptor may be used to accommodate other sizes of gland eg NPT, or
conduit system. See diagram 2.
ii) an elbow kit may be supplied to enable the entry to be rotated axially through 90° and
radially through 360°. See diagram 3.
Earthing / grounding – The user must make suitable local earthing arrangements, if required,
to ensure that metal glands are earthed.
An earthing point is provided inside the enclosure. If this is disturbed in any way it must be
reassembled correctly to be an effective earth and prevent ingress. See diagram 4. When
removing the lid slacken the M4 nut first and ensure it is re tightened whenever the lid is
replaced. See diagram 4.1.
ENCLOSURE ‘A’
Cable Glands and adaptors – Enclosure ‘A’ is supplied with an M20 x 1.5 tapped hole. Use a
suitable stainless steel cable gland and sealing washer. Alternately the enclosure may be
supplied with a threaded adaptor fitted at the factory ready to accept the customer’s gland or
conduit system. See diagram 5.
Earthing / grounding – Bonding between the enclosure and gland / adaptor will be achieved
when both parts are screwed together. An earthing point is provided inside the enclosure. If
this is disturbed in any way it must be reassembled correctly to be an effective earth and
prevent ingress. See diagram 4.
EARTHING / GROUNDING OF PROCESS CONNECTION AND BACK PLATES – All the
internal dead metal work is bonded to the enclosure earthing point. Due to requirements of
sealing, the process connection and back plates may be isolated from the earthing point. Do
not, therefore, rely on either for earthing, instead always use the earthing point provided. If
required, the process connection and back plates may be bonded locally. Never use the
process connection or inlet pipe for locally grounding welding equipment unless it is separately
earth bonded.
Pollution degree – all products are suitable for use in pollution degree 3. For extreme
conditions where condensation may readily form, then sealed contacts should be used. See
Table A codes 08/09, 0G/0H, H2/H3/H6.
Electrical isolation – These products are not suitable for electrical isolation. Always isolate
circuit separately to carry out any electrical work.
TABLE A – MICROSWITCH RATINGS
S
W
I T
C
H
C
O
D
E U L / C S A
M I C R O S W I T C H
R A T I N G
( R E S I S T I V E )
* S E E N O T E
IEC 947-5-1 / EN 60947-5-1 RATING
U
im
p
U
i D e s i g n a t i o n
&
U t i l i s a t i o n
C a t e g o r y
VA
R A T I N G
( I e I U e )
M
a
k
e
B
r
e
a
k
0 0
&
0 1
5 A @ 1 1 0 / 2 5 0
V A C
0 . 6 / 0 . 3 A @
1 2 0 / 2 4 0 V A C
A C 1 4 /
D 3 0 0 AC 4 3 2 7 2
0 . 8 k V 2 5 0
V
0 . 2 2 / 0 . 1 A @
1 2 5 / 2 5 0 V D C
D C 1 3 /
R 3 0 0 D C 2 8 2 8
0 2
&
0 3
5 A @ 1 1 0 / 2 5 0
V A C
0 . 6 / 0 . 3 A @
1 2 0 / 2 4 0 V A C
A C 1 4 /
D 3 0 0 A C 4 3 2 7 2
0 . 8 k V
250
V
2 A @ 3 0 V D C 0 . 2 2 / 0 . 1 A @
1 2 5 / 2 5 0 V D C
D C 1 3 /
R 3 0 0
D C 2 8 2 8
0 4
&
0 5
1 A @ 1 2 5 V A C
1 A @ 1 2 5 V A C R E S I S T I V E ( I E C 1 0 5 8 - 1 / E N 6 1 0 5 8 - 1 )
* 1 0 0 m A @ 3 0
V D C
0 8
&
0 9
* 5 A @
1 1 0 / 2 5 0 V A C
0 . 6 / 0 . 3 A @
1 2 0 / 2 4 0 V A C
A C 1 4 /
D 3 0 0
A
C
4 3 2 7 2
0 . 5 k V 2 5 0 V
5 A @ 3 0 V D C 0 . 2 2 / 0 . 1 A @
1 2 5 / 2 5 0 V D C
D C 1 3 /
R 3 0 0 D C 2 8 2 8
0 G
&
0 H
* 1 A @ 3 0 V A C
A C 1 4 /
E 1 5 0 A C 2 1 6 3 6
0 . 5 k V 1 2 5 V 0 . 3 A @ 1 2 0
& 3 0 V D C V A C
0 C 5 A @ 1 1 0 / 2 5 0
V A C
0 . 8 k V 2 5 0 V
0 . 6 / 0 . 3 A @
1 2 0 / 2 4 0
V A C
A C 1 4 /
D 3 0 0 A C 4 3 2 7 2
0 D
5 A @ 1 1 0 / 2 5 0
V A C
0 . 6 / 0 . 3 A @
1 2 0 / 2 4 0 V A C
A C 1 4 /
D 3 0 0
A C 4 3 2 7 2
0 . 8 k V
250
V
2 A @ 3 0 V D C
0 . 2 2 / 0 . 1 A @
1 2 5 / 2 5 0 V D C
D C 1 3 /
R 3 0 0 D C 2 8 2 8
H 2
&
H 3
&
H 6
5 A @ 1 1 0 / 2 5 0
V A C
0 . 6 / 0 . 3 A @
1 2 0 / 2 4 0 V A C
A C 1 4 /
D 3 0 0
A
C
4 3 2 7 2
0 . 5 k V
250
V
2 A @ 3 0 V D C 0 . 2 2 / 0 . 1 A @
1 2 5 / 2 5 0 V D C
D C 1 3 /
R 3 0 0 D C 2 8 2 8
T h e e l e c t r i c a l r a t i n g i s d e p e n d e n t o n t h e m i c r o s w i t c h f i t t e d t o t h e
i n s t r u m e n t . T h e e l e c t r i c a l r a t i n g i s d e f i n e d b y e a c h a p p r o v a l t h a t t h e
m i c r o s w i t c h c o m p l i e s w i t h a n d i s s h o w n o n t h e p r o d u c t n a m e p l a t e , i e U L /
C S A , o r I E C . I t s h o u l d b e n o t e d t h a t t h e s w i t c h m u s t b e u s e d w i t h i n t h e
e l e c t r i c a l r a t i n g s p e c i f i e d f r o m t h e a p p r o v a l y o u r e q u i r e . T a b l e A l i s t s t h e
a c t u a l I E C r a t i n g s a g a i n s t t h e D e s i g n a t i o n & U t i l i s a t i o n C a t e g o r y m a r k e d
o n t h e n a m e p l a t e . I n t h e a b s e n c e o f a n y v e r i f i c a t i o n b y U L / C S A t h e
m i c r o s w i t c h * m a n u f a c t u r e r ’ s r a t i n g i s s p e c i f i e d i n b o l d i t a l i c s . I f i n
d o u b t , s e e k g u i d a n c e f r o m f a c t o r y .
ENCLOSURE WALL
LOCKNUT
NYLON 22/20
REDUCER FIBRE WASHER
PROPRIETARY
GLAND
DIAG 1
‘W’ CABLE GLAND ASSY
CABLE GLAND /
CONDUIT ADAPTOR
DIAG 2
‘W’ ADAPTOR ASSY
GLAND
SCREW FIBRE
WASHER O RING
SEAL
½" NPT Pg 13.5
M20 X 1.5 ¾ ET ENCLOSURE
WALL
DIAG 3
ELBOW ASSY
M4 PLAIN
W ASHER
M4 SCREW
EARTH
STRAP
M4 STUD
M4 SINGLE
COIL W ASHER
M4 NUT
LID
BASE
GASKET
DIAG 4.1
EARTH STRAP
E N C L O S U R E M 2 0 x 1 . 5
F IB R E W A S H E R
A D A P T O R
D I A G 5
‘ A ’ A D A P T O R
E A R T H L A B E L
E N C L O S U R E W A LL
(E X T E R IO R )
S C R EW
B O N D E D S E A L
S IN G L E
C O IL
W A S H E R
P LA IN
W AS H E R S
S T A R W A S H E R
N U T
N U T
D IA G 4
E AR T H IN G AS S Y
Declaration of Conformity
We: Delta Controls Ltd
Island Farm Avenue
West Molesey
Surrey, UK
KT8 2UZ
As the manufacturers of the apparatus listed, declare under our sole responsibility that the products
listed below:
Pressure, Pressure Difference, Temperature & Flow switches series “W” or “A”:
201, 202, 203, 281, 204, 207, 208, 209, 231, 232, 233, 234, S21, S22, S24, GR2, GR4, VM2, VM4.
301, 303, 304, 381, 384, 306, 386, 310, 316, S31, S34, GR3, GR6.
721, 731, 771, 722, 732, 772, 723, 733, 773, 781, 734, 774, 741, 742, 743, 744, S71, GR7.
131.
To which this declaration relates are in conformity with the following relevant standards or parts
thereof:
EN 60947-1 :1992
Low voltage switch gear and control-gear-general rules.
EN 60947-5-1:1992 Low voltage switch gear and control-gear-control circuit devices and switching
elements.
EN 60529: 1991 Specification for classification of degrees of protection provided by enclosures.
EN 60950:1992 Safety of information technology equipment including electrical business equipment:
section 2.5.
BS 6134:1991
Specification for pressure and vacuum switches.
And thereby conforms to the requirements of the Low Voltage Directive 73/23/EC amended by
93/68/EEC.
Signed:
………………….
R. Harrison
Managing Director
Original dated 22
nd June 2000
Rev. B dated 12 th August 2009