VLT
®
5000 Series
Special
functions
NB!:
The max. brake resistance selected should
have an ohmic value max. 10% lower than
that recommended by Danfoss. If a brake
resistor with a higher ohmic value is selected, the
160% braking torque will not be achieved and there
is a risk that the frequency converter will cut out for
safety reasons. For further information, please consult
Brake Resistor Instruction MI.90.FX.YY.
NB!:
If a short circuit in the brake transistor
occurs, power dissipation in the brake resistor
can only be prevented by using a mains
switch or contactor to disconnect the mains for
the frequency converter. (The contactor can be
controlled by the frequency converter).
■ References - single references
Using a single reference, only one active reference
signal is connected, either in the form of an external
or in the form of a preset (internal) reference.
The external reference can be voltage, current,
frequency (pulse) or binary via the serial port. Two
examples are given below of the way the single
references are handled by VLT 5000 Series.
Example 1:
External reference signal = 1 V (min) - 5 V (max)
Reference = 5 Hz - 50 Hz
Configuration (parameter 100) - Speed
control, open loop.
/External
U/f on terminal 53,
54 or 60. f (pulse)
on terminal 17 or 29
binary (serial port).
Single ref.
\ Preset references (par.215-218)
Setting:
Parameter: Setting: Data value:
100 Configuration Speed control, open loop [0]
308 Funct. of analogue input Reference [1]
309 Min. reference signal Min. 1 V
310 Max. reference signal Max. 5 V
203 Reference range Reference range Min - Max [0]
204 Minimum reference Min. reference 5 (Hz)
205 Maximum reference Max. reference 50 (Hz)
The following can be used: - Catch-up/slow-down via digital input terminals 16,17, 29, 32 or 33
- Freeze reference via digital input terminals 16,17, 29, 32 or 33.
MG.51.A9.02 - VLT is a registered Danfoss trademark
81
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