17
7.2 - Power supply
The power supply must conform to the specification on the
chiller name plate. The supply voltage must be within the range
specified in the electrical data table.
For connections refer to the wiring diagrams.
WARNING: Operation of the chiller 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 supply source at once and ensure that the chiller is
not switched on until corrective measures have been taken.
30RA 200-240
652
718
783
365
404
442
193
258
324
39
39
8.5
PE
1
X
Y
C
C
Legend
1
Main disconnect switch
PE Earth connection
S
Power supply cable section (see table "Recommended wire sections").
X
Disconnect switch position referred to the unit side
Y
Control box position referred to the unit base
X (mm)
Y (mm)
30RA 040 - 080
190
762
30RA 090 - 160
1415
762
30RA 200 - 240
1161
1107
NOTES:
The 30RA 040-240 units have only one power connection
point located at the main disconnect switch.
Before connecting electric power cables, it is imperative to
check the correct order of the 3 phases (L1 - L2 - L3).
Non-certified drawings. Refer to the certified drawings
supplied with the unit or available on request.
7.3 - 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 ; 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.
Motor
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