Manual KVBF

6 Safety devices
The motors have been provided with thermal protection via resistors (PTC) as a standard.
7 Constructional set-up
These fans are belt driven fans with a sturdy design. The motors are running outside the air stream.
The outside of the fans is galvanized steel with a sturdy contruction.
The centrifugal forward curved impeller is made by galvanized steel.
In B3 conventional motors, the motorsupport console is of galvanized steel sheet.
As a default, the fans are provided with three phase motors (400 V, 50 Hz) with integrated resistor. The elec-
trical motor protection class is at least IP 54, ISO F.
The fans can be run in permanent operation from –20 °C to 55 °C ambient and conveying temperature.
The dynamic counterbalancing is done according to ISO 1940 T1, Class G 6.3.
The electrical connection is via a terminal box positioned direct at the motor.
The standard motors suited for operation with a frequency inverter.
If the fans are controlled with a frequency inverter, connection of the thermal protection, resistor (standard
PTC) or also thermocontacts (TC) in the motor is necessary.
The KVB/F fans have been developed as a standard for horizontal, mounting direct on the oor. For outdoor
installation a weather protection is needed.
9
AX - 12.2012
Smoke and heat exhaust fans