Operating instructions

The introduction of the power cable must be
done such that in case of water an entry along
the power-supply cable is impossible. The
connecting cable may not touch sharp objects.
Connecting and arrangement of the switch
bridges according to enclosed wiring diagram.
Connect protective conductor to grounding
terminal. For further working processes see
“Putting into operation”. When connecting
rotary current fan types exchange 2 phases for
counterclockwise rotation. For maintenance an
all-pole disconnecting isolator should be
installed directly by the fan.
Motor protection
a) For motors without built-in automatic
temperature controller (thermal contact or
PTC-resistor):
Protection by motor-protection switch.
Connect all 3 current paths to ensure
proportionate heating of the bimetal. For
motors with more than 1 speed each speed
must be protected separately.
Adjust motor-protection switch approxima-
tely 10 – 15 % higher than the current noted
on the fan rating plate. Test release function
of the motor-protection switch.
The motor-protection switch should break
the circuit within 60 seconds.
Attention: This protection is not suitable for
speed controlled operation and does not
protect the motor at high air-flow
temperature or lacking cooling.
b) Fans with built-in thermal contacts: These
have the additional type designation TK. For
connecting we recommend these especially
developed motor-protection devices:
MW – for 220 V ~
MD – for 380 V/3~, one speed
M 2 – for 2 speed separated winding
380 V/3~
M 3 – for 2 speed Dahlander winding
380 V/3~
M 4 – for 2 speed star/delta connection
circuit 380 V/3~ phase
Speed control
For speed controllable fans with frequent power
switching currents are variable and depend
upon the type of operation. To ensure reliable
protection of the motor windings the unit has to
be equipped with thermal contacts or PTC
(positive temperature coefficient) thermistors
together with full motor protection or tripping
devices. Conventional circuit breakers (MCB) do
not give sufficient protection, as the motor may
overheat before this type of device comes into
operation.
For certain types and sizes of motors speed
control via a frequency inverter is only possible if
the unit is fitted with a SINUSFILTER (where
each winding is fitted with a PTC thermistor)
which must be positioned between the inverter
and the motor. Please specify at the time of
ordering if the fan is to be used for use with an
inverter.
Motor thermal contacts have to be wired to the
terminal block and protected by a motor
protection unit/circuit breaker. Explosion proof
fans and pole-switching motors must not be
operated with a frequency inverter.
If a frequency inverter is to be installed it is
important that the maximum current at the
motor terminal does not exceed 1000 V and the
current surges do not exceed 500/Vms max.
(IEC 34-17). If during operation the earth current
exceeds a value of 3.5 mA, earthing must be in
accordance with DIN VDE 0160/5.88 para
6.5.2.1.
The range of frequency control is 10 – 50 Hz.
The maximum frequency (50 Hz) must not be
exceeded for standard fans, as motors will
overheat and damage may occur.
Use attenuators to reduce excessive motor
noise. For speed controlled fans, however, air
flow temperatures must never exceed the
maximum levels stated for the motor when
controlled.
Warning
The use of controllers not recommended by
Helios may invalidate the guarantee. Do not use
products manufactured by others as this may
cause problems with the equipment and may
cause failure of the fan and/or controller.
E Exe II protected fans
Use, connection and operation underlie special
regulations (e.g. EN 50014 to 50020); in cases
of doubt further inquiry is necessary. In standard
cases the guidelines for explosion protection
(Explosionsrichtlinien – Ex-RL) can be refered to
in order to classify explosive areas. Fans offered
in standard execution may only be operated in
zones 1 and 2. Speed control and continuous
turning on and off is not permitted.
The temperature class of the motor noted on
the motor rating plate has to correspond to the
temperature class of the possibly occurring
airgas mixture.
Every motor (pole-changeable motors = every
speed) must have a motor-protection device,
connected in series which is to be adjusted to
the rated current of the motor and which trips
within the given time tE provided the impeller is
blocked. The function is to be tested on the
basis of the tripping characteristic line enclosed
with the protection switch.
Also observe the regulations especially
enclosed with the device and DIN 57165/VDE
0165. The sucking in or entering of foreign
substances in the fan has to be avoided by
using protection devices according to IP 20
resp. with a mesh width of not more than 12
mm. The unhindered running of the impeller and
smooth running of the bearings has to be
checked at least once a year. Repairs must be
carried out by Helios work shops or be
approved by an authority.
Putting into operation
The following checks are to be carried out:
– check for operation according to the inten-
ded purpose of the fan
– compare power supply voltage with data on
the rating plate
– check if fan is tightly mounted
– check all parts especially screws, nuts and
grille for tight fit
– test unhindered running of the impeller
– check if direction of rotation and air-flow di-
rection correspond
– compare current consumption with data on
the rating plate
– test functioning of motor protection device
– test protective conductor connection
– check sealing of the connection cable and
tight clamp of the cable wires
– check placement of condensation water
openings
– start operation only if a protection against
accidental contact with impeller is guaran-
teed
Sound level
The sound levels stated in the catalogue can
differ considerably after installation as the sound
pressure level depends on the absorption
capacity of the room, the place of installation
and other factors.
Sound reduction is possible by using sound
attenuators (deliverable for certain types as
accessory) and by speed regulation.
Accessories, switches and controlling devices.
The use of accessories not offered or
recommended by Helios is not permitted.
Maintenance
Excessive deposit of dirt, dust, grease and
other materials on the impeller, motor and
protection grille especially between housing and
impeller is to be avoided and has to be
prevented by periodical cleansing. Also make
sure that condensation water openings are
unclogged. The motors have maintenance free,
long-lasting greased ball bearings. After
approximately 20 000 hours of running at 1500
U/min. or aftermax. 4 years at normal operation
conditions or after 2 years of storage or
standstill they should be greased again or better
still renewed. If the fan is used for important
functions servicing is necessary at least every 6
months, in case of standstill for a longer period
of time it must be serviced before starting
operation.
Attention: All servicing only in dead state.
Warranty – Exclusion of Liability
If the preceding instructions have not been
observed all warranty claims and fair dealing are
excluded. This also applies to any liability claims
extended to the manufacturer.
Indications – Disturbance origins
– If the motor protecton trips this could be the
result of dirt build-up, a hard running impeller
and/or ball bearings.
– If the motor protection device trips it could
be the same as with the motor protection
but also too high winding temperature
through insufficient motor cooling, false di-
rection of rotation or too high air flow tempe-
rature.
– Abnormal noises can mean worn out ball
bearings.
– Vibrations can originate from an unbalanced
or dirty impeller or due to the installation.
– Extreme performance reduction can occur if
the fan operating range is higher than the
final point of operation (causing also higher
sound level). Reasons for this can be the
lack of sufficient streaming in of air or too
high resistance of the ventilation system.
Test approvals
For details please refer to our catalogues.
26
General installation, operating and maintenance instructions