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• Protection against foreign bodies being drawn
in may no longer be guaranteed.
• The explosive atmosphere may no longer be
extracted.
• The fan is thermally designed for continuous
operation (operating mode S1), i.e., it is not
designed for frequent changes in direction of
rotation. The fan motor may heat up imper-
missibly if the direction of rotation is changed
frequently.
16.5 PTC thermistor triggering sys-
tem, on/off switch
1. Install PTC thermistor triggering system and
wire in accordance with wiring diagram (→
wiring diagram, Fig. E, terminals 4, 5 and 6).
Recommendation: It is imperative that
MAICO MVS 6 be installed outside the area
with a potentially explosive atmosphere.
2. Fit an On/Off switch provided by the cus-
tomer.
16.6 Checking electrical connection
1. Perform the following checks: D = detailed
check, N = close inspection, S = visual in-
spection
Test schedule
I
Screws, cable and line feeds
(direct and indirect), blind clos-
ures are of the correct type,
complete and sealed.
II Cable and line type appropriate
for the purpose.
III No visible damage on cables
and lines.
IV Electrical connections secure.
V Unused connection terminals
tightened.
VI Insulation resistance (IR) of mo-
tor windings satisfactory.
VII Earth connections, including any
additional potential compensa-
tion connections, are correct
(e.g. connections are tight, con-
ductor cross-sections are suffi-
cient).
VIII Error loop impedance (TN sys-
tem) or earth resistance (IT sys-
tem) satisfactory.
IX Automatic electrical protective
equipment set correctly (auto-
matic resets not possible).
X Special operating conditions are
observed (PTC thermistor trig-
gering system in accordance
with Directive 2014/34/EC).
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 protec-
tion. Ensure that there are no dirt particles in
the terminal box and that the seal of the ter-
minal box cover has close contact all the way
around the terminal box. Note tightening
torques of 1.4 Nm. Check seal integrity of ter-
minal box.
12
17 Commissioning
17.1 Checks before commissioning
1. Perform the following checks: D = detailed
check, N = close inspection, S = visual in-
spection
Test schedule
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 en-
tering the housing in compliance
with the IP rating.
IV Encapsulated components un-
damaged.
V Impeller at sufficient distance
from housing (air gap).
VI Air flow not hampered. No for-
eign bodies in the air section.
VII Sealing of shafts, cables, ducts
and/or "lines" satisfactory.
VIII Duct system and transition to
mixed system undamaged.
D N S
IX Unit has sufficient protection
● ● ●
from corrosion, weather, vibra-
tion and other interfering factors.
X Accumulations of dust or dirt not
excessive.
●
17.2 Checking correct functioning
● ● ●
1. Switch on unit and perform the following
checks: D = detailed check, N = close inspec-
●
tion, S = visual inspection
●
Test schedule
I Direction of rotation / air flow dir-
●
ection.
II Ensure correct power consump-
● ● ●
tion The rating current (→ rating
plate) may be higher or lower de-
pending on local conditions (duct
distance, altitude, temperatures).
I
may be exceeded at nominal
max
●
voltage due to ageing or a reduc-
tion in terminal voltage (e.g. trans-
former).
●
III Thermal safety is ensured by the
motor protection switch system.
18 Cleaning, maintenance
●
According to Directive 1999/92/EC, the work-
place and work equipment must be main-
tained with due regard to safety. The points
listed in EN 60079-17 must be taken into ac-
●
count and carried out.
The intervals should be determined by the oper-
ating company in accordance with EN 60079-17
● ●
and may be extended if a sufficient maintenance
concept is used – frequency depending on ambi-
ent conditions and anticipated restrictions. The
●
maintenance intervals are to be shortened in
case of dust or a corrosive atmosphere.
DANGER Danger of electric shock.
Prior to accessing the connection terminals, dis-
connect all supply circuits.
Secure against being switched back on, check
that no voltage is present.
Earth and connect the EARTH with active parts
which are to be short-circuited.
D N S
Cover or block off neighbouring live compon-
● ● ●
ents.
Attach a clearly visible warning sign.
Ensure that there is no explosive atmosphere
●
and/or dust layers.
CAUTION Hot motor surfaces may result
●
in skin burns if touched.
Do not touch hot motor surfaces. Always wait
until the motor has cooled down.
●
CAUTION Risk of injury if there is no
protection against accidental contact (pro-
●
tective grille) on the free air inlet/outlet.
In particular, there is danger if the unit is in-
● ● ●
stalled in a manner accessible to people.
Fan may only be operated with an access
● ● ●
guard.
Areas with possible access to rotating parts (im-
peller) should be made safe with an access
●
guard according to EN ISO 13857, e.g. with
MAICO protective grille SG.. (meets IP 20 de-
● ● ●
gree of protection according to EN 60529).
NOTICE Damage to the unit if the line feed-
through to the terminal box is pre-installed.
● ● ●
Line feedthroughs may be damaged if the con-
nection line is pulled or the unit is lifted by the
line.
Do not pull connection lines or lift the unit using
the lines.
18.1 Cleaning by a qualified person
Regularly clean unit at appropriate intervals with
D N S
a damp cloth, especially after long periods out of
●
service.
Clean unit at shorter intervals if you expect lay-
●
ers of dust to accumulate on the impeller and
other parts of the unit.
18.2 Maintenance by a qualified per-
son
The fan should be regularly checked and main-
tained. In particular, ensure:
• unimpaired flow in the air duct.
• 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 inter-
val), undertake a complete check in accordance
with the previous test schedules.
This involves checking the function of safety
components, air gap, power consumption, bear-
ing noise, damage and disproportional vibration
(e.g. impeller imbalance). Remove dirt and for-
eign particles.
18.3 Repairs
In the event of wear/tear on unit components,
have the unit repaired or overhauled only by a
certified repair shop.
19 Fault rectification
See Action to take in the event of a fault
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