Danfoss VZH Series Instructions page 2

Instructions
Oil level switch assembly
Install the screw-in optical part on oil level
switch port. (Factory preset for manifold version
VZH compressor.)
Install the electrical part on optical part. Make
sure the cable outlet downside vertically
Electrical connections / Wiring
1: Power supply wire
3
2: Power supply wire
2
1
3: Output wire
4
4: Not used
see at the correct diagram corresponding
to different power supply models for proper
wiring
24VDC MODEL
24VDC
OVDC
1 2
Sensor 3
24VAC MODEL
24VAC
OVAC
1 2
Sensor 3
External
Load / Relay
230VAC MODEL
L
N
1 2
Sensor 3
External
Load / Relay
2
- Depending on the frequency converter
version, the physical position of individual
connectors may differ from below diagram.
- Always make sure that the compressor termi-
nals T1, T2, T3 are connected to the frequency
converter terminals 96, 97, 98 respectively.
- The compressor motor cable must be shielded
and the armoured part must be connected to
ground on both cable ends; at the side of the
compressor and at the side of the frequency
converter.
L1
L2
L3
91, 92, 93:
95:
External
39, 42
Load / Relay
50:
53:
54:
55:
12:
12:
13:
13:
18:
19:
27:
29:
32, 33
20:
37:
98:
97:
96:
99:
02, 01:
06, 05, 04:
69, 68:
61:
- : Optional connection
The CDS303 frequency converter is factory pre-
set with parameters for the open loop control
principle. The process loop control principle
can be selected by changing parameters in the
«Quick menu».
FRCC.EI.024.A1.02 © Danfoss Commercial Compressors 10/12
Basic connections
91 L1
92 L2
93 L3
95 PE
39 39 Ana out COM
42 42 Ana out +
50 50 Ana out +10 V
53 53 Ana in 0 ± 10 V
54 54 Ana in 0 ± 10 V
55 55 Ana in COM
12 12 +24V
13 13 +24V
18 18 Dig in
19 19 Dig in
27 27 Dig in/out
29 29 Dig in/out
32 32 Dig in
33 33 Dig in
20 20 Dig in COM COM RS485 61 61
37 37 Dig in
3 Phase mains input
Earth
Analogue output
Analogue output
PLC+ (0 to 10 V)
Sensor -
PLC-
HP/LP switch
External On/Off (NO)
Factory bridged to 37
Sensor +
External On/Off (NO)
Digital input
HP/LP switch (NC) / safety devices
Digital input/output
Digital input
Digital input Common
Factory bridged to 13
To compressor terminal T3
To compressor terminal T2
To compressor terminal T1
To compressor earth connection
Relay 1 to oil solenoid valve
Relay 2
RS485 Bus
RS485 Bus Common
X : Mandatory connection
- Use an EMC cable gland for cable installation and
perfect grounding; The metallic terminal box of
the compressor has a paint-free surface around
the connection hole for better conductivity.
- A low pressure safety switch is mandatory
to avoid compressor vacuum operation.
- At start-up, verify that the compressor rotates
in the right direction and pumps.
W 98 T3
V 97 T2
U 96 T1
PE 99
NC 03
230 V or 24V
NO 02
～
COM 01
2 A max
NC 06
NO 05
COM 04
N- RS485 69 69
P+ RS485 68 68
Open loop
X
X
-
-
X
-
X
X
X
X
-
X
-
X
-
-
-
X
X
X
X
X
X
-
-
-
Open loop:
0 - 10 V control
Frequency converter in slave mode
Process loop:
4 - 20 mA control
Frequency converter under own PID controller
Legends:
Ana: Analogue
Dig: Digital
in: Input
out: Output
COM: Common
NC: Normally-closed
NO: Normally-open
Process loop
X
X
-
-
-
X
-
X
X
X
X
X
-
X
-
-
-
X
X
X
X
X
X
-
-
-