GENER
AL INFORMA
TION
PR
ODUC
T INFORMA
TION
SY
STEM DESIGN
INTEGR
ATION INT
O SY
STEM
ORDERING INFORMA
TION
The frequency converter is pre-set for speed
open loop control. This means that the speed set-
point is given by a 0-10V, where 0V corresponds
to the minimum compressor speed and 10V is
maximum compressor speed.
The unit controller must have full control of
the compressor operation and application
protections such as compressor envelope
control, oil return management and short cycling
protection.
Below is the Danfoss proposed system
configuration and wiring.
Unit Architecture
ID
Name
Setup 1
Factory Setup
341
Ramp 1 Ramp Up Time
180
30.00
342
Ramp 1 Ramp Down Time
180
30.00
512
Terminal 27 Digital Input
No operation
Stop inverse
540.1
Function Relay
Alarm
VLT running
2800
Short Cycle Protection
Disabled
Enabled
2810
Oil Return Management
Off
On
L1
L2
L3
PE
T1
T2
T3
PE
Comp. ON /OFF
Start / Stop
+24V CC (150mA max.)
+24V CC
Digital Input
Digital Input
Digital Input
Digital Input
Digital Output
Digital Input
Digital Input Common
Analog Output Common
Analog Inputs Common
COM Serial
P Communication
N RS-485
Analog Output 1 0/4-20mA
Safe Stop Input
SCHEMATIC DIAGRAM
CDS 303
HP switch
0-10V DC speed signal
VZH
Alarm
Contactor
Fuses
3 phase
L2
L1
91
92
93
95
96
97
98
99
82
81
89
88
-DC
+DC
R-
R+
CM 01
02
03
04
05
06
NO
NC
CM
NO
NC
L3
PE
PE
W
V
U
power input
Motor output
Load sharing
Brake resistor
Relays
Relay 1
Relay 2
50/60Hz
Relay
Unit Controller
Analogue out
W
X
Y
Z
Digital input
a
b
+10V CC (15mA max.)
Analog Input 1
Analog Input 2
12
13
18
19
27
29
32
33
20
37
39
42
50
53
54
55
61
68
69
NOTE 1: Only relevant parameters or the ones different from factory defaults are shown.
NOTE 2: Oil boost, short cycle protection to be programmed in the unit controller
NOTE 3: Use Safe Stop for HP switch in CDS303 or use an output contactor (CDS803)
Drive parameters to adjust (See Note 1)
SY
STEM DESIGN
22
AB237586440343en-000601