Helios Explosion-proof Series, Installation And Operating Instructions Manual

Page: 23 / 48

3.2 Minimum air gap in compliance with the material combinations
Move impeller by hand to test unhindered running of impeller.
Before installing check the minimum air gap between the impeller tip and casing according to the following table:
If the stated values do not correspond to the specified
dimensions, the fan may not be installed or operated.
For questions, please contact the Helios customer service.
Own repair attempts are strictly prohibited!
3.3 Recommended tightening torque for mounting screws
The following tightening torques for connection of mounting nuts and screws (grade 8.8) are to be used:
The impeller mounting on the motor shaft is secured at the factory with liquid thread lock against loosening.
3.4 Functional safety - Emergency operation
When using the fan in important technical supply function it must be be installed in such a way that with fan failure au-
tomatically an emergency operation is guaranteed. Suitable solutions are e.g.: Parallel operation of two devices of lower
performance with separated current supply, standby fan, alarm and emergency ventilation systems.
3.5 Electrical connection
Before any maintenance or installation work or before opening the terminal compartment, the device is to be
fully isolated from the power supply and secured against unintended restart!
– The regulations to avoid danger of ignition due to electrostatic discharges (TRBS 2153) must be implemented.
– The electrical connection must be carried out only by a qualified electrician in accordance with the data in the
terminal box and enclosed wiring diagrams!
– The relevant standards and safety regulations (eg DIN VDE 0100) are strictly to be observed.
– An all-pole mains switch / isolator switch with at least 3 mm contact opening (VDE 0700 T1 7.12.2 / EN 60335-1)
is mandatory.
– Every motor must have a motor protection device of category II(2)G, see Directive 2014/34/EU ( Equipment Safety
Act), which is to be adjusted to the rated current of the motor and which trips within the given time tE on the motor type
plate privided the motor is blocked. The function is to be tested on the basis of the tripping characteristic line enc-
losed with the protection switch. Also observe the regulations especially enclosed with the device.
– Electrical connection data must correspond to the data on the motor type plate.
– The installation of power cable is to be carried out professionally! The connecting cable may not touch sharp objects.
– For cable entries and connections only explosion-proof cable glands must be used!
– AC types are to be connected by interchanging two phases for counterclockwise rotation in the clockwise rotating
field.
– Security components, e.g. safety grille may not be dismantled, bypassed or disabled.
– Further operations see the following section "Putting into operation".
– Ground connections, including any supplementary equipotential bonding must be properly installed!
D
Type Casing Ø (mm) Minimum air gap (in mm)
HQ.. 250 Ex 250 2,5
HQ.. 315 Ex 315 3,2
HQ.. 355 Ex 355 3,6
HQ.. 400 Ex 400 4,0
HQ.. 450 Ex 450 4,5
HQ.. 500 Ex 500 5,0
HQ.. 560 Ex 560 5,6
HQ.. 630 Ex 630 6,3
HQ.. 710 Ex 710 7,1
5
HQ..
m
– Axial high-performance fans
Installation and Operating Instructions
Fig.4
ATTENTION
UK
ATTENTION
Screw size Tightening torque
M8 20 Nm
M10 35 Nm
M12 60 Nm
M16 150 Nm
WARNING