15
Motor
A
B
C
5.3 - Power connection/disconnect switch
30XW-V/30XWHV 580-880
units have one connection point
30XW-V/30XWHV 1150-1710:
•
Standard unit: two connection points
•
Unit with option 81: one connection point.
5.4 - Recommended wire sections
Wire sizing is the responsibility of the installer, and depends
on the characteristics and regulations applicable to each
installation site. The following is only to be used as a
guide-line, and does not make in any way liable. After wire
sizing has been completed, using the certified dimensional
drawing, the installer must ensure easy connection and
define any modifications necessary on site. The connections
provided as standard for the field-supplied power entry
cables to the general disconnect/isolator switch are
designed for the number and type of wires, listed in the
second column of the table below.
The calculations for favourable and unfavourable cases are
based on the maximum current for each unit (see electrical
data tables). For the design the standardised installation
methods in accordance with IEC 60364 are used: multicon-
ductor PVC (70°C) or XLPE (90°C) insulated cables with
copper core; arrangement to comply with table 52c of the
above standard. The maximum temperature is 42°C. The given
maximum length is calculated to limit the voltage drop to 5%.
5.5 - Power cable entry
The power cables can enter the control box from above
the unit. A removable aluminium plate on the upper part
of the control box face allows introduction of the cables.
Refer to the certified dimensional drawing for the unit.
5 - ELECTRICAL CONNECTION
Please refer to the certified dimensional drawings, supplied
with the unit.
5.1 - Power supply
The power supply must conform to the specification on the
unit nameplate. The supply voltage must be within the range
specified in the electrical data table. For connection details
refer to the wiring diagrams.
WARNING: Operation of the unit with an improper supply
voltage or excessive phase imbalance constitutes abuse
which will invalidate the Carrier warranty. If the phase
imbalance exceeds 2% for voltage, or 10% for current,
contact your local electricity supplier at once and ensure
that the unit is not switched on until corrective measures
have been taken.
5.2 - Voltage phase imbalance (%)
100 x max. deviation from average voltage
Average voltage
Example:
On a 400 V - 3 ph - 50 Hz supply, the individual phase
voltages were measured to be:
AB = 406 V; BC = 399 V; AC = 394 V
Average voltage = (406 + 399 + 394)/3 = 1199/3
= 399.7 say 400 V
Calculate the maximum deviation from the 400 V average:
(AB) = 406 - 400 = 6
(BC) = 400 - 399 = 1
(CA) = 400 - 394 = 6
The maximum deviation from the average is 6 V. The
greatest percentage deviation is: 100 x 6/400 = 1.5 %
This is less than the permissible 2% and is therefore
acceptable.
Minimum and maximum connectable wire sections
Max. connectable
wire section*
Calculation favourable case: Perforated horizontal conduit
(standardised routing No. 13) - XLPE insulated cable
Calculation unfavourable case: Closed conduit (standard-
ised routing No. 41) - PVC insulated cable, if possible
30XW-V/30XWHV
Circuit(s) A/B
Section, mm²
(per phase)
Section**, mm²
(per phase)
Max. length, m
Cable type
Section**, mm²
(per phase)
Max. length, m
Cable type***
Units without option
580
2 x 240
1 x 120
250
XLPE
1 x 240
420
PVC
630
2 x 240
1 x 150
250
XLPE
2 x 150
450
PVC
810
2 x 240
1 x 185
250
XLPE
2 x 185
450
PVC
880
2 x 240
1 x 240
280
XLPE
2 x 240
480
PVC
1150
2 x 240/2 x 240
1 x 120/1 x 120
250/250
XLPE
2 x 150/2 x 150 520
PVC
1280
2 x 240/2 x 240
1 x 150/1 x 150
250/250
XLPE
2 x 185/2 x 185 510
PVC
1470
2 x 240/2 x 240
1 x 240/1 x 150
310/250
XLPE
2 x 240/2 x 185 520/510
PVC
1570
2 x 240/2 x 240
1 x 240/1 x 240
310/310
XLPE
2 x 240/2 x 240 530/530
PVC
1710
2 x 240/2 x 240
1 x 240/1 x 240
280/280
XLPE
2 x 185/2 x 185 400/400
XLPE
Units with option 81
1150 to 1710
4 x 240
2 x 240
280
XLPE
4 x 185
320
XLPE
* Connection capacities actually available for each machine, defined according to the connection terminal size, the control box access opening size and the available
space inside the control box.
** Selection simultation result considering the hypothesis indicated.
*** If the maximum calculated section is for an XLPE cable type, this means that a selection based on a PVC cable type can exceed the connection capacity actually
available. Special attention must be given to the selection.
Note:
The currents considered are given for a machine equipped with a hydronic kit operating at maximum current.
