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actuator(hereinafter referred to as NQBEx Explosion-proof Electric Actuator ) have been tested,
experimented and finally verified by the national verified explosion-proof organization and get
Conformity Certificate of Explosion-Proof.
The explosion-proof grade of NQBEx explosion-proof type is Ex d II B T4.
The meaning of the alphabet and number in this explosion-proof sign: “Ex” shows that the
electric apparatus comply with the Explosion-proof Standard; “d” shows that the explosion-proof
type is enclosure explosion-proof; II class represents that electric apparatus used in explosive gas
environment except for gas made from coal; II B represents that the gas is ethylene; T4 indicates
that the permissible surface temperature is 135
℃
. “Gb” is the protection grade of apparatus.
The above-mentioned product with that explosion-proof sign is applied to use in IIA and IIB
factory. Inflammable gas and steam whose temperature class is T1-T4. (Please refer to GB3836.1
and GB3836.2 during product choosing so as to ensure correct usage).
Two sets of Operation Manual, provided with other attached documents, are General type of
electric actuator operation manual and this explosion-proof type of electric actuator operation
manual. Please refer to the General type operation manual for technical parameters, overall
structures and functions, adjustment means. Please refer to this part instruction for the
explosion-proof performance, wiring procedure and usage notice. For the explosion-proof
certificate No. And technical serial No., please refer to product’s nameplate.
For the outline dimension, flange dimension connected with valve and the position and
dimension of inlet wire position of explosion-proof wiring box please refer to the catalogue from
our Company.
5.2 Notice for usage and maintenance
Refer to Fig.1 for the structure
5.2.1 Power must be cut off when actuator’s any cover is open. (Please see the warning plate:
“Forbid to open the box cover when the power is on.”)
5.2.2 Don’t hit the openness window glass with something hard.
5.2.3 Keep the explosion-proof case from being hit.
5.2.4 Keep the nameplate and warning plate being fixed on actuator and the words on them
should be recognized.
5.2.5 Don’t open the electric box cover outdoors in rainy day or windy day.
5.2.6 Keep the explosion-proof cover from being bumped or scratched during debugging and
maintenance.
5.2.7 Apply anti-rust painting 204-1 after debugging or maintenance and before assembling.
5.2.8 Please notify the company to change the broken explosion-proof elements. The products
cannot be powered on until it is renewed with qualified element.
5.2.9 Fastening screws on the explosion-proof cover should be reliably fixed and spring washer
cannot be lost. Regular check for the vibration condition to see if it is reliable.
5.2.10 Don’t lose O-ring and change a new one in case of it is broken.
5.2.11 The ground terminal shall be safely earthed.
5.3 Electric schematic diagram and explosion-proof terminal board
The electric schematic diagram of explosion-proof type is the same as which is shown in the
General Type of Product Operation Manual. Projecting numbers and alphabets are printed on the
explosion-proof terminal board. The wiring numbers and terminal numbers are on this diagram.
User could refer to it for wiring.
Содержание NQB1
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