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6 - ELECTRICAL CONNECTION
6.1 - Electrical connections, control box BW10
18
S
Legend
1
Main disconnect switch
PE Earth connection
S
Power supply cable section (see table "Recommended wire sections").
NOTES:
The BW10 020-090 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 dimensional drawings.
Before connecting the unit check that the phase order in the
customer control box is the same as shown in the customer
wiring diagrams.
22
1
1
18
26
PE
6.2 - 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 connections refer to
the wiring diagrams.
WARNING: Operation of the unit with an incorrect supply
voltage or excessive phase imbalance constitutes abuse which
will invalidate the Danfoss warranty. If the phase imbalance
exceeds 2% for voltage, or 10% for current, contact your
local electricity supply at once and ensure that the unit is not
switched on until corrective measures have been taken.
6.3 - 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.
6.4 - 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 Danfoss 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 table
below.
The calculations are based on the maximum machine current (see
electrical data tables). For the design the following
standardised installation methods are used, in accordance with
IEC 60364, table 52C:
•
For units installed inside the building:
No.13: perforated horizontal cable conduit, and No. 41:
closed conduit.
Motor
Motor
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