Thermal Protection; Speed Control - Multifan V-FloFan Installation Instructions Operating Instructions

3~
L1 L2
3~
L1 L2
Illustration 12: 3~STAR / DELTA with optional thermal detectors (thermostats)
Control
This fan is supplied without a control or control system. A control or a control
system must be provided for operation of the fan.
Isolator
This fan is supplied without an electrical isolator (power supply disconnecting
(isolating) device). An electrical isolator must be provided to facilitate safe
maintenance and troubleshooting.
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.
4.2.1

Thermal protection

1~ fan motor thermal protection
Thermal protectors are built-in standard in 1~ fan motors. Thermal protectors
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.
8 | ENGLISH
L3
TB
TB
L3
TB
TB
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.
3~ fan motor thermal detection (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 load for the thermostat (TB)
V : maximum 500 V
AC
I : maximum 1.6 A
AC
Cos Φ: minimum 0.6
Maximum number of switching cycles: 1000
V : maximum 12 V
DC
I : maximum 40 A
DC
Maximum number of switching cycles: 1000
4.2.2

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:
FC = 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.
Original instructions
V-FloFan
INS00003-B