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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.
CAUTION:
Operation of the unit with an improper supply voltage or
excessive phase imbalance constitutes abuse which will
invalidate the manufacturer 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.
B
A
C
Motor
5.3 - Power connection/disconnect switch
Units
19PV550 to 800
19PV900 to 1600
Option 81
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 on the next page.
The calculations for favourable and unfavourable cases are based
on the maximum current for each unit (see electrical data tables).
The design uses the standardised installation methods in
accordance with IEC 60364: multiconductor 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 40°C. The given maximum length is calculated to limit the voltage
drop to 5%.
Connection points
1 per unit
1 for circuit A
1 for circuit B
1 per unit
15
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