Danfoss VZH052 Manual page 22

Unit Architecture
L1
L2
L3
PE
Comp. ON /OFF
Start / Stop
Relay a
b
HP switch
Unit Controller
0-10V DC speed signal
W
Analogue out
X
Y
Digital input
Z
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)
ID Name
341 Ramp 1 Ramp Up Time
342 Ramp 1 Ramp Down Time
512 Terminal 27 Digital Input
540.1 Function Relay
2800 Short Cycle Protection
2810 Oil Return Management
22
AB237586440343en-000601
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.
SCHEMATIC DIAGRAM
12 +24V CC (150mA max.)
13 +24V CC
18 Digital Input
19 Digital Input
27 Digital Input
29 Digital Output
32 Digital Input
33 Digital Input
20 Digital Input Common
37 Safe Stop Input
Analog Output Common
39
42 Analog Output 1 0/4-20mA
50 +10V CC (15mA max.)
53
Analog Input 1
54 Analog Input 2
55
Analog Inputs Common
61 COM Serial
68
P Communication
69
N RS-485
Setup 1
180
180
No operation
Alarm
Disabled
Off
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.
CDS 303
L1 91
3 phase
power input L2 92
50/60Hz L3 93
PE 95
U 96
Motor output 97
V
W 98
PE 99
-DC 88
Load sharing
+DC 89
81
R-
Brake resistor
R+ 82
Relays
CM 01
Relay 1 NO 02
NC 03
CM 04
NO
Relay 2 05
NC 06
Factory Setup
30.00
30.00
Stop inverse
VLT running
Enabled
On
Fuses
Contactor
T1
T2
T3
PE
VZH
Alarm