Thermal Protection; Speed Control - Multifan Mobile Fan Betriebsanleitung

Mobile Fan
Grounding
The fan must be grounded. Ground the fan according to local
regulations.
NOTICE
Overcurrent protection
The use of an individual separate overcurrent protective device per
fan is highly recommended.
NOTICE
Overload protection
The use of an individual separate overload protective device (Motor
Protective Circuit Breaker) per fan is highly recommended.
Switching device
This fan is supplied without a switching device. A switching device must be
provided.
Power cable routing
Illustration 1: power cable routing
Route the power cable through the cable gland in the housing to the outside
of the fan.
4.1.1

Thermal protection

1~ fan motor thermal protection
Thermal detectors are built-in standard in 1~ fan motors. Thermal detectors
are of the thermostat type TB: thermostat opening on increase of
temperature.
In 1~ fan motors, the thermostat (TB) is by default wired in series with the
phase (L) of the supply. The motor is as such self-resetting: when the motor
overheats, the thermostat will switch off the motor automatically and once the
motor has cooled down, the motor will start automatically again.
The presence of the text "Thermally Protected" on the rating plate and/or
datasheet indicates that thermal protection is built-in the 1~ fan motor and that
it is wired in series with the phase (L) of the supply.
WARNING
If the unexpected start of the motor by the thermostat can
cause a hazard or is prohibited by local regulations, the ther-
mostat must be connected into a control circuit that will not al-
low the motor to restart until the circuit is manually reset.
INS00014-D Original instructions
3~ fan motor thermal protection (optionally available)
Thermal detectors are optionally available in 3~ fan motors. Thermal
detectors are of the thermostat type TB: thermostat opening on increase of
temperature.
In 3~ fan motors, the thermostats (TB) are by default wired to separate
terminals on the terminal block. An external control circuit can be connected
here. NOTICE! The thermostats in 3~ fan motors cannot be
wired in series with the power supply.
Maximum thermostat (TB) load
When connecting an external control circuit to the thermostats, the following
load limits must be observed:
AC ≤ 500 V
≤ 1.6 A
Cos φ ≥ 0.6
DC ≤ 12 V
≤ 40 A
Table 1: Maximum thermostat (TB) load
4.1.2

Speed control

Verify that this fan is suitable for speed control. On the datasheet and rating
plate the following (combination of) codes can be found:
F = suitable for frequency control / VFD (Variable Frequency Drive)
E = suitable for electronic voltage control (TRIAC / phase cutting)
T = suitable for transformer voltage control
WARNING
If none of these codes is listed, this fan cannot be speed con-
trolled!
Variable Frequency Drive (FC / frequency control)
• Do not reduce the frequency to less than 20% of the nominal frequency
as listed on the rating plate.
• When using a variable frequency drive, the wiring instructions of the vari-
able frequency drive manufacturer must be followed.
WARNING
Do not increase the frequency beyond the nominal value as lis-
ted on the rating plate
Electronic Voltage Control (TRIAC / SOLID-STATE / phase
cutting)
• Do not reduce the voltage to less than 40% of the nominal voltage as lis-
ted on the rating plate.
• Motor noise (humming) can occur due to this type of control
Transformer voltage control
• Do not reduce the voltage to less than 40% of the nominal voltage as lis-
ted on the rating plate.
ENGLISH | 5