3.2.1 1-0* General Settings
1-00 Conguration Mode
Select which application control principle should be used.
Option: Function:
[0] * Open Loop
NOTICE
This parameter cannot be
adjusted when compressor
runs.
Compressor speed is determined by
applying a speed reference or by
setting speed when in Hand Mode.
Open loop is also used if the
frequency converter is part of a
closed-loop control system based
on an external PI controller
providing a speed reference signal
as output.
[3] Process Closed
Loop
Compressor speed is determined by
a reference from the built-in PI
controller varying the compressor
speed as of a closed loop control
process (for example, constant
pressure or ow). Congure the PI
controller in parameter group 20-**
Drive Closed Loop.
1-13 Compressor Selection
The default setting of most of the parameters in the frequency
converter (for example, compressor data, limits, ramps ) depends
after the compressor and system refrigerant selected for the
frequency converter. The frequency converter selects the default
compressor based on the power size and voltage range for the
frequency converter.
Range: Function:
NOTICE
If the compressor selection is
changed, all dependent
parameters reset to default
and any user settings are lost.
[24] VZH028-R410A
[25] VZH035-R410A
[26] VZH044-R410A
[27] VLZ028
[28] VLZ035
[29] VLZ044
1-71 Start Delay
Range: Function:
60 s* [0 - 120 s] This parameter species the delay
of the starting time after each start.
1-90 Motor Thermal Protection
Using ETR (Electronic thermal relay), the compressor motor
temperature is calculated based on frequency, current, and time.
Danfoss recommends using the ETR function, if a thermistor is
not present.
Option: Function:
[0] No protection Disables temperature monitoring.
[1] Thermistor
warning
A thermistor gives a warning if the
upper limit of the compressor
temperature range is exceeded.
[2] Thermistor trip A thermistor gives an alarm and
makes the frequency converter trip
if the upper limit of the compressor
temperature range is exceeded.
[3] ETR warning 1 Calculates the load of the
compressor and gives a warning if
overloaded.
[4] ETR trip 1 Calculates the load of the
compressor and gives a trip if
overloaded.
[22] ETR Trip -
Extended
Detection
Start motor thermal calculation
based on actual load and time as
well as motor frequency, when the
motor current is above 110% of the
nominal motor current. Another
situation is to start motor thermal
calculation when the motor current
is less than 110% of the nominal
motor current and trigger current
limit.
1-93 Thermistor Source
Select the input to which the thermistor (PTC sensor) should be
connected. When using an analog input, the same analog input
cannot be used as a reference in parameter 3-15 Reference 1
Source to parameter 3-17 Reference 3 Source.
Option: Function:
NOTICE
This parameter cannot be
adjusted while the compressor
runs.
NOTICE
Digital input should be set to
[0] PNP - Active at 24 V in
parameter 5-03 Digital Input 29
Mode.
[0] * None
[1] Analog input
AI53
[6] Digital input
29
Parameters
VLT
®
Compressor Drive CDS 803
22 Danfoss A/S © 06/2019 All rights reserved. MG18P202
33
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