9
Control output reference (tacho)
Important
The applied voltage and the value of the pull-up
resistor must be selected that the current does
not exceed 20 mA.
Frequency = speed (rpm) * 0,6015
Example:
669 Hz / 0,6015 = 1112,21 rpm
-> 36 impulse / revolution
B = customer side
A = fan side
open collector circuit
8.3
Variable-speed fans (Frequency converter / EC motor)
Risk from resonant frequencies.
♦
Only operate the fan outside these speed ranges.
♦
Pass through these speed ranges so quickly that any vibration cannot exceed the admissible resonant frequency
values.
♦
For variable-speed fans, use a permanent vibration monitoring for long-term safe operation.
Operation of the frequency converter
♦
Heating of the motor due to use of a variable
frequency drive must be checked in the application by
the customer.
♦
Avoid running the fan via the frequency converter
below 10 Hz.
♦
Starting time: min. 60 sec.
Commissioning of the frequency converter
♦
Observe the operating instructions of the frequency
converter.
♦
Install the fan and frequency converter as near as
possible to one another.
♦
Use shielded cables.
♦
All components (fan, frequency converter and motor)
must be grounded.
♦
We recommend using all-pole sinus filters.
♦
Never exceed the maximum impeller rotation speed
indicated on the name plate of the fan.
218839 | 002
Summary of Contents for 218463
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