Centrifugal blowers and fans Axial fans

Information
Table of characteristics
Locked-rotor protection
General remarks:
All EC motors are protected against improper
use (locked-rotor protection) in accordance
with relevant regulations.
Sizes 045, 055, 074 and 084:
The motor windings are de-energised with
locked-rotor condition. The motor tries to
restart every 5 seconds. Once the rotor is no
longer locked, the motor will restart.
Sizes 084 and 112 with external electronics:
A thermal switch is built into the motor. The
external electronics will de-energise the motor
windings once the rotor is locked. Either the
enable input or the power supply have to be
disconnected for a moment to restart the
motor. If an RS485 interface is used, restart via
software is possible.
Start-up, overload, current limitation
Sizes 045, 055, 074 and 084:
In general, there is soft start. In case of overload,
the current is limited and the motor will
eventually be shut off.
Sizes 084 and 112 with external electronics:
Soft start is included in the external electronics
as standard.
Closed loop / open loop speed control
EC motors are controlled via PWM or linear
(0-10 VDC) input signal. There is an open loop
speed control so that the speed changes
depending on the load. (Standard interfaces,
see page 21). Closed loop speed control is possible
for sizes 084 and 112 with external electronics,
in size 150 with integrated electronics.
There are inputs for potentiometers, 0-10 VDC
or PWM signals.
PWM (pulse width modulation)
A PWM signal is a square wave signal with a
variable pulse-pause ratio.
n
n min
n max
Linear closed loop /open loop speed control
At 0 VDC, the motor is de-energised and does
not rotate. From 1 VDC onwards, the motor
starts to run. Maximum speed is reached at
10 VDC.
n
n min
1 V
PWM
100 %
10 V
H-level
19
Accessories EC-SYSTEMS
EC axial
EC centrifugal
AC axial
AC centrifugal