Bernard Controls SQX Series Instructions For Start-Up

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1.2 INSTALLATION AREA
This actuator is an explosion-proof equipment and can be used in the following areas depending
on the marking :
Zones Classification
Zone 1 (gas) & 21 (dust): the explosive atmosphere is likely to occur occasionally in normal operation.
Zone 2 (gas) & 22 (dust): the explosive atmosphere is not likely to occur in normal operation but
if it does occur, it will persist for a short period of time only.
Divisions Classification
Gaz groups
(*) Other gas, please consult a notified body (INERIS or LCIE i.e)
The temperature class corresponds to the actuator maximum surface temperature.
1.3 CAUTIONS FOR ELECTRICAL CONNECTION
Opening the covers
To avoid any risk of explosion, do not open when explosive atmosphere may be present. It is prefe-
rable that the actuator electric control and power supply are switched off before opening the cover.
Be careful not to damage the joint surfaces of the cover.
The explosion proof joint may be lubricated with a grease that does not become hard and is anticorrosion
(example TOTAL N31271 or SHELL TIVELLA GLOO).
Be careful not to damage the gaskets when repositioning the cover onto the actuator body. Tighten
each cover screw.
Screws of explosion-proof actuator body must be of a minimum 8.8 quality grade or made of
stainless steel with a minimum 70 daN/mm2 tensile strength.
In case of use in explosive dust atmosphere, check that cover tightness gaskets are intact and make
sure not to degrade the gaskets while closing the cover. Cable entries shall provide a level of protection
equal or higher than the one indicated on the actuator identification plate. The user shall ensure a regular
cleaning of the product housing to avoid dust build-up.
Overheating
A motor thermal protection switch is (refer to actuator electric diagram) integrated into the motor
control circuit in order to switch off the motor power supply in case of overheating conditions. This
protection is mandatory to respect maximum surface temperatures.
Cable entries
Check that cable glands are used and wiring done according to the explosion-proof equipment standards ;
take a special care of the compatibility between the cable diameter and the cable gland size. If one
of the cable entries is not used, seal it with a certified metal plug and without adapter.
If an adapter is necessary to fit a cable gland, only one is allowed by cable entry and use a certified one.
Conduit entries
Check that conduit entries are used and wiring done according to the explosionproof equipment
standards ; seals are required to prevent the passage of flames through the conduit system. A
certified sealing fitting has to be mounted at maximum 55mm (2 in) from the housing. Only explo-
sionproof unions coupling are permitted. If one of the conduit entries is not used, seal it with a
certified pipe plug.
The actuator is delivered with a yellow sticker,in the connection compartment, that obstruates the cable
entries. The danger symbol and a notice warns the installer of the obligation to equip each cable entry
with a certified plug or cable gland or conduit.
For cable gland and plug take care of the marking:
ATEX : Exd (or Exe in case of an increased safety « e » connexion
compartment)
IECEx : Exd (or Exe in case of an increased safety « e » connexion
compartment)
Brazil : Brazilian certification Exd.
For Exd box, the thread type is indicated in the connection box
to avoid confusion (NPT or ISO).
If the ambiant temperature exceeds 60°C, consider an additional
10°C at the cable entry. I.e, at a maximum ambiant temperature of
70°C, the temperature at the cable entry will be 80°C.
CSA divisions CSA Zones Typical gas (*)
C, D IIB Ethylene
B IIB + H2 Hydrogen
- IIC Hydrogen, Acetylene
Class Max surface temperature
T4 135°C
T5 100°C
T6 85°C
WARNING
This device has not been designed to be operated in areas where the risk
of getting explosive atmosphere, frequently or during long periods, is high (Zone 0).
Actuator type STX.., ST175, ST220 SQX
Protection Ex d, Ex tb Ex d, Ex tD Ex d, Ex tb
Zone 1 or 2 21 or 22 1 or 2 21 or 22 1 or 2 21 or 22
Atmosphere G Gas D Dust G Gas D Dust G Gas D Dust
Actuator type STX.., ST175, ST220 SQX
Protection
Class I, Gr B, C, D
Class II, Gr E, F, G
Class I, GR C, D
Class I, Gr B, C, D
Class II, Gr E, F, G
Division 1 1 1

Bernard Controls SQX Series Specifications

General

Brand	Bernard Controls
Model	SQX Series
Category	Controller
Language	English