Danfoss VZH028 Series Instructions Manual page 3

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
© Danfoss | DCS (CC) | 2019.03
- Depending on the frequency converter
version, the physical position of individual
connectors may differ from below diagram.
- Always make sure that the compressor
terminals 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
preset with parameters for the open loop control
principle. The process loop control principle
can be selected by changing parameters in the
«Quick menu».
Basic connections for VZH052-065 drives
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
AN233086441027en-000201 | 3
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
-
-
-