8
Motor protection switch, on/off switch
1. Install motor protection switch and wire in accord-
ance with wiring diagram (
wiring diagram, Fig.
D, terminals 4, 5 and 6).
Recommendation:
Only install MAICO MVEx
outside areas subject to explosion hazards.
2. Set motor protection switch to nominal motor
current (not I
max
).
3.
Fit an On/Off switch provided by the customer.
Checking electrical connection
1. Perform the following checks: D = detailed
check, N = close inspection, S = visual inspection
Test schedule
D N S
I
Screws, cable and line feeds
(direct and indirect), blind closures
are of the correct type, complete
and sealed
.
●
●
●
II
Cable and line type fit for
purpose.
●
III
No visible damage on cables and
lines.
●
●
●
IV
Electrical connections secure.
●
V
Unused connection
terminals tightened.
●
VI
Insulation resistance (IR) of motor
windings satisfactory.
●
VII
Earth connections, including any
additional potential compensation
connections, are correct
(e.g. connections are tight, conduc-
tor cross-sections are sufficient).
●
●
●
VIII
Error loop impedance (TN
system) or earth resistance (IT
system) satisfactory.
●
IX
Automatic electrical protective
equipment set correctly (automatic
resets not possible).
●
X
Special operating conditions are
satisfied (motor protection switch).
●
XI
All cables and lines which are not
being
used are connected correctly.
●
XII
Installation with changeable
voltage in agreement with the
documentation.
●
●
XIII
Electrical insulation clean/dry.
●
2. Fit terminal box cover for explosion protection.
Ensure that there are no dirt particles in the
terminal box and that the seal of the terminal box
cover has close contact all the way around the
terminal box. Note tightening torques of 1.4 Nm.
Check seal integrity of terminal box.
18 Commissioning
Checks before commissioning
1. Perform the following checks: D = detailed
check, N = close inspection, S = visual inspec-
tion
Test schedule
D N S
I
No damage or unauthorised
changes on unit.
●
●
●
II
Condition of terminal box seal
satisfactory. Ensure connections
are sealed.
●
III
No evidence of water or dust
entering the housing in compliance
with the IP rating.
●
IV
Encapsulated components undam-
aged
●
V
Check capacitor for leak
tightness..
●
Test schedule
D N S
VI
Air flow not hampered. No foreign
bodies in the air section.
●
●
●
VII
Sealing of shafts, cables, ducts
and/or conduits satisfactory.
●
●
●
VIII
Conduit system and transition to
mixed system undamaged.
●
IX
Unit has sufficient protection from
corrosion, weather, vibration and
other interfering factors.
●
●
●
X
Accumulations of dust or dirt not
excessive.
●
●
●
Checking correct functioning
1. Switch on unit and perform the following
checks
according to the test schedule:
Test schedule
D N S
I
Direction of rotation / air flow
direction
●
II
Ensure correct power consumption
The rating current
(
rating plate) may be higher or
lower depending on local condi-
tions (duct distance,
altitude, temperatures).
●
III Thermal safety is ensured by the
motor protection switch
system.
●
19 Cleaning, maintenance
Perform repeat checks (cleaning and mainte
-
nance intervals) for ventilation systems in ac-
cordance with BetrSichV 2015 at least annually.
Only an electrician trained in explosion protec-
tion may undertake cleaning and maintenance.
The intervals should be determined by the operating
company in accordance with EN 60079-17 and may
be extended if a sufficient maintenance concept is
used – frequency depending on ambient conditions
and anticipated restrictions. Shorten the mainte-
nance intervals in the event of dust or a corrosive
atmosphere.
!
DANGER
Danger from electric shock.
Before accessing
the connection terminals, release all power supply
circuits, protect against switching on again, ensure
unit is de-energised, earth and connect the EARTH
with active parts which are to be short-circuited,
and cover or make inaccessible adjacent energised
parts. Attach warning sign in clearly visible place.
Ensure that there is no explosive atmosphere.
!
CAUTION
Hot motor surfaces may result in skin burns if
touched.
Do not touch hot motor surfaces. Wait
until the motor has cooled before undertaking
cleaning and maintenance work.
!
CAUTION
Danger of injury if there is no protection
against reaching / contact (protective grille) on
the uncovered air inlet/outlet.
Fan may only be
operated with
protection against reaching in
on
both sides.
NOTICE
: Damage to the unit
Units with pre-installed line feedthrough to the
terminal box may be damaged if the connec-
tion line is pulled or the unit is lifted using the
line.
Do not pull connection lines or lift the unit
using the lines.
Cleaning by electrician trained in explosion
protection
Regularly
clean fan at appropriate intervals with
a damp cloth, especially after long periods out of
service. Clean fan at
shorter intervals
if you expect
layers of dust to accumulate on the impeller and
other parts of the fan.
Maintenance by electrician trained in explosion
protection
The fan should be regularly checked and main-
tained. In particular, ensure:
● unimpaired flow in the air channel.
● the effectiveness of the protective grilles.
●
compliance with the permitted temperatures.
●
quiet bearings. Bearing life of 40 000 hours,
depending on application.
●
cables are secure in the terminal box.
●
potential damage to terminal box, cable
screw-connections, sealing plugs and cables.
●
secure routing of cables.
During regular safety checks (maintenance interval),
undertake a complete check in accordance with the
test schedules in Chapters 16, 17 and 18.
This involves checking the function of safety compo-
nents, air gap, power consumption, bearing noise,
damage and disproportional vibration (e.g. impeller
imbalance). Remove dirt and foreign particles.
Repairs
If unit components are worn, send fan to our factory.
Unit component replacements and/or repairs are
only permitted in the manufacturer’s factory.
20
Fault rectification
Chapter 11, Action to take in the event of a fault.
21 Disassembly and environmentally-
sound disposal
!
DANGER
Danger from electric shock.
Before accessing
the connection terminals, release all power supply
circuits, protect against switching on again, ensure
unit is de-energised, earth and connect the EARTH
with active parts which are to be short-circuited,
and cover or make inaccessible adjacent energised
parts. Attach warning sign in clearly visible place.
Ensure that there is no explosive atmosphere.
●
Only an electrician trained in and authorised
for explosion protection work may undertake
disassembly.
●
Once they have reached the end of their useful
lives, dispose of units in an environmental-
ly-sound manner in accordance with local
requirements.
Acknowledgements:
© Maico Elektroapparate-Fabrik GmbH. Translation from
German of original mounting and operating instructions.
We cannot be held responsible for mistakes or printing
errors and retain the right to make technical modifi
-
cations without giving prior notice. The brands, brand
names and protected trade marks that are referred to in
this document refer to their owners or their products.
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