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Instructions
PID Closed Loop menu for VTZ Compressor Drive
Parameter Nº
Par. Description
01-00
Configuration Mode
03-01
Reference / Feedback Unit
03-02
Min. Reference
03-03
Max. Reference
03-10
Preset reference
03-13
Reference site
03-15
Reference resource 1
06-10
Terminal 53 Low Voltage
06-11
Terminal 53 High Voltage
Terminal 53 Low Reference /
06-14
Feedb. value
06-15
Terminal 53 High ref / Feed. value
06-20
Terminal 54 Low Voltage
06-21
Terminal 54 High Voltage
Terminal 54 Low Current (only
06-22
visible if switch set to I)
Terminal 54 High Current (only
06-23
visible if switch set to I)
06-24
Terminal 54 Low ref / Feedb. value -1
Terminal 54 High ref / Feedb.
06-25
value
Process CL Feedback Input
07-20
resource
07-33
Process PID Gain
07-34
Process PID Integration time (ms)
Pressostat + Anti-short cycling
SLC
function
13-00
Smart Logic Controller On/Off
Comparator 0 (=cut-in pressure
13-12.0
value)
Comparator 1 (=cut-out pressure
13-12.1
value)
13-20.0
Timer 0 (Start-to-Start timer)
13-20.1
Timer 1 (Minimum Run-time)
* SLC: Smart Logic Controller
© Danfoss | DCS (CC) | 2019.04
Default
For PID, change to
Speed Open
Process
Loop
rpm
Bar or psi
2100 rpm
-1 [Bar] (-100 if SLC is used)
5400 rpm
12 [Bar] (100 if SLC is used)
0
Not necessary to change
linked to Hand
(local) / Auto
Select Local or Remote
(remote)
Leave as Input 53 or set to
Input 53
«No function»
0
No change
10
No change
2100
E.g. 1 [Bar]
5400
E.g. 5 [Bar]
Minimum value in V for the
1V
pressure transmitter's range
Maximum value in V for the
5V
pressure transmitter's range
Minimum value in mA for
4
the pressure transmitter's
range
Maximum value in mA for
20
the pressure transmitter's
range
Value according to transmit-
ter
Value according to transmit-
9
ter
If input 54 is used for trans-
Analog Input 54
mitter no change is needed
2
According to system
9000 ms
According to system
Optional
feature
Off
3 Bar
Set desired start pressure
1 Bar
Set desired stop pressure
Set desired time from start
5 min
to start
Set desired minimum run-
0 min
ning time
Comment
Allows the drive to receive a feedback from the refri-
geration system, typically pressure or temperature.
In the following it is assumed pressure feedback is
used.Hence, the input frequency to the compressor
can be adjusted according to de cooling demand.
The feedback (suction pressure) can be displayed on
the LCP in its appropriate unit.
Sets the minimum range for the pressure transmitter
Sets the maximum range for the pressure transmit-
ter
Value will be added to the speed reference or to the
set point for the PID control (closed loop)
From where the operator will control the Frequency
Converter. To use a local reference adjusted locally
on the Drive select «local». To apply an external refe-
rence select «Remote». To use SLC it is always nee-
ded to push «Auto On»
If PID set point is modified via external reference:
Leave as Input 53. If set point is fixed and set locally
in Drive: Set to «No function»
Minimum value in Volts for the reference signal. Only
relevant if external reference is used (input 53 selec-
ted in 3-15)
Maximum value in Volts for the reference signal.
Only relevant if external reference is used (input 53
selected in 3-15)
Only relevant if external reference is used (input 53
selected in 3-15)
Only relevant if external reference is used (input 53
selected in 3-15
Depends on output from the feedback device. Nor-
mally no changes are needed
Depends on output from the feedback device. Nor-
mally no changes are needed
Depends on output from the feedback device. Nor-
mally no changes are needed
Depends on output from the feedback device. Nor-
mally no changes are needed
Min value for range in Bar of pressure transmitter
Min value for range in Bar of pressure transmitter
Selects which input signal is used for PID-Closed
loop control
Proportional gain of PID. Default values suitable for
most systems for suction pressure control
Integral time of PID in ms. Default valus suitable for
most systems for suction pressure control
Only active if 13-00 set to On
Set only to On if pressostat function + anti short
cycling are to be active
Pressostat function
Pressostat function
Anti-short cycling function, 5 min = 12 starts per
hour allowed
Compressor will run for 1 min. before stopping
AN000086420674en-000201 | 23
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