9
NOTE
Intake air ducting must always
be of sound construction (no
unstable tubes).
If the thermal overload relay
is operated in the „Automatic
reset“ setting, damage to the
motor cannot be excluded.
This renders any guarantee
null and void!
NOTE
Measuring nominal current
and current consumption
Following installation of the air
ducting on induction and air outlet
sides, the following checks should
always be carried out by by expert
personnel only, to ensure perfect
functioning of the fan.
1. For purposes of precise
measurement, all air ducting on
induction and air outlet sides
(areas of resistance) must be
fitted to the device and any
exhaust guard grille opened.
2. The mains voltage available
must be checked for correct
ness.
Drops in voltage
must not
be allowed during operation.
3. Note that the nominal current
(Ampere) stated on the type
plate of the motor must not
be exceeded in any mode
of operation.
4. The fan stages 1 and 2 each
have a separate thermal over
load relay and must be set
accordingly.
Setting the thermal overload
relay
1. In order to preclude errors in
measurement each phase
conductor and fan stage must
be tested separately.
2. The setting of the thermal over
load relay should be performed
as follows:
Stage 1 = 6.7 A
Stage 2 = 17.0 A
3. The function of the thermal
overload relay and its
setting values must be tested
by the simulation of a missing
phase conductor.
e.g. by switching off a circuit
breaker
4. With correct function and
setting of the thermal overload
relay, it should switch off after
approx. 30 seconds.
5. All measurements and tests
must be performed separately
for each fan stage
Excessive current
consumption
If the motor is using too much
current, despite correct electrical
connection and adequate voltage
supply, the thermal overcurrent trip
may not under any circumstances
be set higher or short-circuited.
■
Appropriate measures must
be taken such as checking or
adjusting the outside
induction and air outlet
diameters and lengths.
CAUTION
Never interrupt the mains
connection before the entire
cool-down phase comes to an
end. Damage caused to the
device by overheating renders
the guarantee null and void.
CAUTION
The thermal overload relay
may only be operated in the
„Manual reset“ setting. The
relay must not switch itself on
again after the cooling down
process.
