VLT
®
5000 Series
parameter 214. Logic ’0’ = external references ac-
tive; logic ’1’ = one of the four preset references is
active in accordance with the table below.
Preset reference, lsb and Preset reference, msb
enables a choice of one of the four preset refer-
ences, in accordance with the table below.
Preset ref. msb Preset ref. lsb
Preset ref. 1 0 0
Preset ref. 2 0 1
Preset ref. 3 1 0
Preset ref. 4 1 1
Freeze reference - freezes the actual reference.
The frozen reference is now the point of enable/con-
dition for
Speed up and Speed down to be used.
If speed up/down is used, the speed change always
follows ramp 2 (parameters 209/210) in the range 0 -
Ref
MAX
.
Freeze output - freezes the actual motor frequency
(Hz). The frozen motor frequency is now the point of
enable/condition for Speed up and Speed down to
be used.
If speed up/down is used, the speed change always
follows ramp 2 (parameters 209/210) in the range 0 -
f
M,N
.
NB!:
If Freeze output is active, the VLT frequency
converter cannot be stopped via terminals 18
and 19, but only via terminal 27 (to be programmed
for Coasting stop, inverse [0] or Reset and coasting
stop, inverse [1]).
After Freeze output , the PID integrators are reset.
Speed up and Speed down are selected if digital
control of the up/down speed is desired (motor po-
tentiometer). This function is only active if Freeze
reference or Freeze output has been selected. As
long as there is a logic ‘1‘ on the terminal selected
for speed up, the reference or the output frequency
will increase. Follow ramp 2 (parameter 209) in the
range 0 - f
MIN
.
As long as there is a logic ‘1‘ on the terminal se-
lected for speed down, the reference or the output
frequency will be reduced. Follow ramp 2 (parameter
210) in the range 0 - f
MIN
.
Pulses (logic ‘1‘ minimum high for 3 ms and a mini-
mum pause of 3 ms) will lead to a change of speed
of 0.1% (reference) or 0.1 Hz (output frequency).
Example:
Terminal Freeze ref./
(16) (17) Freeze output
No speed change 0 0 1
Speed down 0 1 1
Speed up 1 0 1
Speed down 1 1 1
The speed reference frozen via the control panel can
be changed even if the VLT frequency converter has
stopped. The frozen reference will be remembered
in case of a mains drop-out.
Selection of Setup, lsb and Selection of Setup,
msb enables a choice of one of the four Setups;
however, this presupposes that parameter 004 has
been set at Multi Setup .
Selection of Setup, msb/Speed up and Selection
of Setup, lsb/Speed down - together with the use
of Freeze reference or Freeze output - enable up/
down speed change.
The selection of Setup occurs in accordance with
the below verification table:
Selection of Setup Freeze ref/
(32)msb (33)lsb Freeze output
Setup 1 0 0 0
Setup 2 0 1 0
Setup 3 1 0 0
Setup 4 1 1 0
No speed change 0 0 1
Speed down 0 1 1
Speed up 1 0 1
Speed down 1 1 1
Catch-up/Slow-downis selected if the reference
value is to be increased or reduced by a pro-
grammable percentage value set in parameter 219.
Slow-down Catch-up
Unchanged speed 0 0
Reduced by %-value 1 0
Increased by %-value 0 1
Reduced by %-value 1 1
Ramp 2 is selected if a change between ramp 1 (pa-
rameters 207-208) and ramp 2 (209-210) is desired.
Logic ’0’ leads to ramp 1, while logic ’1’ leads to
ramp 2.
Mains failure inverted is to be selected if parameter
407 Mains failure and/or parameter 408 Quick dis-
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.51.A1.02 - VLT is a registered Danfoss trade mark
130
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