Installation instructions
Centrifugal roof fan
DRD EC
Version 5
– 05.2014 – subject to errors and alterations
Page 6 of 8
MAICO Ventilatoren · Steinbeisstrasse 20 · D-78056 VS-Schwenningen · www.maico-ventilatoren.com
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5 MALFUNCTIONS, CLEANING, SERVICING
Do not carry out any repairs to the device. Always send
the device to the manufacturer for replacement or repair.
WARNING!
The motor starts up automatically again
if a control voltage is applied or speed
setpoint is stored, e.g. following a power
outage.
Risk of injury!
Do not remain in the hazard area of the
device.
Switch off the power supply when working
on the machine and secure against unin-
tentional start-up.
Wait until the device has come to a stand-
still.
NOTE!
If the device has been left standing for a long-
er period, it is recommended that the device is
started up for at least two hours, to allow any
condensate that may have infiltrated to evapo-
rate and the bearing to be moved.
5.1 Malfunctions
Malfunc-
tions/defec
ts
Possible
causes
Possible remedy
Motor is
not rotat-
ing
Mechanical
blockage
Switch off, isolate from
the power supply and
remove mechanical
blockage.
Power supply
defective
Check power supply,
restore supply voltage.
Faulty connec-
tion
Adjust connection, see
terminal assignment.
Temperature
sensor has
responded
Allow the motor to cool,
find cause of the defect
and rectify it, where
appropriate release
anti-pumping device.
Impeller is
running
untrue
Imbalance in
the moving
parts
Clean device. If there
continues to be an
imbalance after clean-
ing, replace device.
Defective
cooling
Improve cooling, if pos-
sible. Reset by switch-
ing off the supply volt-
age for
at least 20 s
Ambient tem-
perature too
high
Lower ambient tem-
perature
, if possible.
Inadmissible
operating point
Check operating point
Contact the manufacturer if you have further malfunc-
tions.
5.2 Cleaning
NOTE!
Damage to the device through cleaning.
Malfunction possible.
Do not clean the device with a water jet or
high-pressure cleaner.
Do not use any acid, alkali cleaning
agents or cleaning agents containing sol-
vents.
5.3 Maintenance
What needs to be
checked?
How do you check?
Protective casing
Periodic visual inspec-
tion
Check the device for damage
Periodic visual inspec-
tion
Secure the device
Periodic visual inspec-
tion
Secure the
connection leads
Periodic visual inspec-
tion
Secure the
protective conductor
Periodic visual inspec-
tion
Isolate the leads
Periodic visual inspec-
tion
Contamination, damage,
corrosion
Periodic visual inspec-
tion
6 CIRCUIT DIAGRAMS
6.1 Wire allocation
Termi-
nal
Colour
Comments
L
Black
230VAC, 50Hz
N
Blue
Neutral conductor
PE
Green/yello
w
Protective conductor
P
orange
not switched
+10VDC
red
Voltage output 10VDC, max
1.1mA, not short-circuit-
proof
AIn1U
yellow
Control input 0-10VDC
GND
dark blue
Control interface connection
Tacho
white
Speed output
COM
white
Potential-free status signal-
ling contact, opener in the
event of fault (2A, max
250VAC)
NC
white
Potential-free status signal-
ling contact, opener in the
event of a fault