Atlas Copco GA 37 VSD, Instruction Book

Page: 118 / 128

9.2 Electric cable size and fuses
Important
• The voltage on the compressor terminals must not deviate more than 10% of the
nominal voltage.
It is however highly recommended to keep the voltage drop over the supply cables
at nominal current below 5% of the nominal voltage (IEC 60204-1).
• If cables are grouped together with other power cables, it may be necessary to use
cables of a larger size than those calculated for the standard operating conditions.
• The cable size is limited between 50 and 95 mm² (see table).
• Use the original cable entry. See section
Dimension drawings .
To preserve the protection degree of the electric cubicle and to protect its
components from dust from the environment, it is mandatory to use a proper
cable gland when connecting the supply cable to the compressor.
• Local regulations remain applicable if they are stricter than the values proposed
below.
• Currents are calculated with the full service factor but we suggest to add 10% due
to over- and under-voltage.
Fuses are maximum allowed values calculated for full service factor and 10%
over- and under-voltage.
• Caution :
• Always double-check the fuse size versus the calculated cable size. If
required, reduce fuse size or enlarge cable size.
• Cable length should not exceed the maximum length according to IEC60204
table 10
Currents and fuses
UL/cUL approval
Compressor type I (1) Max fuse (1) I (2) Max fuse (2)
HSJ
(3)
JJS
(4) K5/
HRC form
II HSJ
(3)
JJS
(4) K5/
HRC form
II
V Hz A A A A A A
GA 37 VSD 460 60 63.9 80 - 67.5 80 -
I: current in the supply lines at maximum load and nominal voltage
(1): compressors without integrated dryer
(2): compressors with integrated dryer
(3): fuse type for compressors with Control Technics converter
(4): fuse type for compressors with Neos converter
Fuse calculations for UL/cUL : the indicated fuse size is the maximum fuse size in order to
protect the motor against short circuit.
Instruction book
116 API480496