52
VLT
®
3500 HVAC
MG.35.B1.02 – VLT is a registered Danfoss trademark
205 Digital reference 1 (REF. 1 DIGITAL)
Value:
-100.00% - +100.00%
★
0 %
of f
MAX.
/analogue reference
206 Digital reference 2 (REF. 2 DIGITAL)
Value:
-100.00% - +100.00%
★
0 %
of f
MAX.
/analogue reference
207 Digital reference 3 (REF. 3 DIGITAL)
Value:
-100.00% - +100.00%
★
0 %
of f
MAX.
/analogue reference
208 Digital reference 4 (REF. 4 DIGITAL)
Value:
-100.00% - +100.00%
★
0 %
of f
MAX.
/analogue reference
Function (parameter 205-208):
Four different, internal, digital references can be
programmed in parameters 205-208.
The internal digital references are stated as a percent-
age of the value f
MAX
(parameter 202). If a f
MIN
(para-
meter 201) has been programmed, the internal, digital
reference as a percentage is calculated from the diffe-
rence between f
MAX
and f
MIN
, and subsequently added
to f
MIN
.
Description of choice (parameters 205-208):
The desired, internal, digital reference is programmed
as a percentage of f
MAX
(parameter 202).
Via terminals 32 and 33 (parameter 406) it is possible
to choose between the four internal, digital references
- see the table below.
Terminal 33
Terminal 32
0
0
Digital ref. 1
0
1
Digital ref. 2
1
0
Digital ref. 3
1
1
Digital ref. 4
NB!:
NB!:
NB!:
NB!:
NB!:
The sign determines the direction of rotation,
if external on/off has been selected in parame-
ter 204.
209 Current limit (f
LIM
) (CURRENT LIMIT)
Value:
0.0 - I
VLT,MAX
★
depending on
the unit
Function:
Here VLT 3500 HVAC's greatest permissible output
current can be set. If the current limit is exceeded, the
output frequency is regulated downwards, until the
current falls to below the current limit. The output
frequency is not regulated upwards to the reference
set, until the current has fallen to below the current li-
mit.
Description of choice:
The value set at the factory corresponds to the rated
output current. If the current limit is to be used as mo-
tor protection, the rated motor current must be
programmed.
In parameter 310 the length of time can be program-
med that VLT 3500 HVAC is to run at the current limit
before cutting out.
The load range between 100 and 110% can be pro-
grammed and is only intended for intermittent opera-
tion. That is why the unit can only perform 110% for
60 seconds.
The intermittent operating time is extended when the
load falls below 110% and becomes unlimited at
100%.
210 Warning: Low frequency (LO FREQ. WARN)
Value:
0.0 - 120 Hz
★
0.0 Hz
Function:
In this parameter the lower warning limit f
LOW
of the
output frequency can be set for VLT 3500 HVAC's
normal operating range, see page ??.
Description of choice:
If the output frequency falls below the set warning li-
mit f
LOW
, the display says LO FREQ. WARN.
The signal outputs can be programmed to give a war-
ning signal (see parameters 407-410).
★
= factory setting. Text in ( ) = display text. Figures in [ ] are used when communicating with the bus.
3.6 Parameter gr
oup 2
