Danfoss VLZ065, Application Manuallines

Page: 15 / 54

Electrical data, connections and wiring
The compressor will only operate properly
in a single direction. If electrical connections
are done correctly between the drive and the
compressor terminals (compressor T1/T2/T3 and
drive terminals U, V & W matching), the drive will
provide correct phase supply to the compressor,
and reverse rotation will be not possible:
• CDS terminal U (96) to VLZ terminal T1
• CDS terminal V (97) to VLZ terminal T2
• CDS terminal W (98) to VLZ terminal T3
If compressor T1/T2/T3 and drive U, V & W
terminals are not matching, the compressor
can operate in a reverse rotation. This results in
excessive noise, no pressure differential between
suction and discharge, and suction line warming
rather than immediate cooling. The compressor
can be rapidly damaged in these conditions.
If reverse rotation symptoms occur, shut the
compressor down and connect the phases to
their proper terminals.
Mains connection to the CDS frequency
converter order has no influence on the output
phase sequence which is managed by the
frequency converter.
Phase sequence and
reverse rotation
protection
The compressor terminal box IP rating according to IEC529 is IP22.
IP rating
Element Numerals or letters Meaning for the protection of equipment
First characteristic
numeral
0
1
2
3
4
5
6
Against ingress of solid foreign objects
(non protected)
≥ 50 mm diameter
≥ 12.6 mm diameter
≥ 2.5 mm diameter
≥ 1.0 mm diameter
dust protected
dust tight
Second
characteristic
numeral
0
1
2
3
4
5
6
7
8
Against ingress of water with harmful effects
(non protected
vertically dripping
dripping (15° tilted)
spaying
splashing
jetting
powerful jetting
temporary immersion
continuous immersion
VLZ scroll compressors are not equipped with
an internal motor protector. Motor protection
is provided by the variable speed drive. All
parameters are factory preset in order to
guaranty locked rotor or overload current
protection. When a warning situation is reached in the
current control, the CDS frequency converter
will automatically reduce the compressor
speed in order to keep the motor current of the
compressor below the maximum allowed.
Motor protection
The maximum allowable voltage imbalance
between each phase is 3%. Voltage imbalance
causes high amperage over one or several phases, which in turn leads to overheating and
possible drive damage.
Voltage imbalance
15
AB444226142054en-000101