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6. Preparations for commissioning
6.3.2
Electrical connection
(USA/CANADA-Version only)
Danger
The power supply to the compressor side has to be
fitted for industrial equipment and fulfilling the
requirements of EN60204-1/IEC60204-1. To avoid
strong damages and fire on the power electric
components, any kind of operation outside of the
stated limits of EN60204-1/IEC60204-1 is
inadmissible.
To establish an electrical connection, proceed as
follows:
Route the supply cable through the cable gland
(- 1 - Fig. 12) on the control cabinet and tighten screws.
Connect the supply line to the connecting terminals as
shown in the circuit diagram.
Fig. 12
Checking the setting of the control-power
transformer
The control-power transformer is factory-preset to the
rated voltage. However, practice has shown that the
actual supply voltage often differs from this value. In
order to adjust the unit to the local conditions, the
setting of the control-power transformer must be
checked by measuring the control-power transformer
output voltages during under load operation and, if
required, re-set. Several tapping points are provided for
this purpose (see circuit diagram).
Fig. 13
Danger
When carrying out adjustment work on the control-
power transformer, the unit must be electrically
isolated and locked off.
Work on the control cabinet may only be carried
out by electrotechnical specialist personnel.
Important
A wrong setting of the control-power transformer
jeopardizes the trouble-free operation of compres-
sor units and can result in malfunction or damage.
The verification of the control-power transformer
setting is a must during commissioning and
periodic inspection/maintenance, as the voltage
supply conditions may vary.
The correct setting should be checked during
under load operation of the unit by measuring the
control power transformer output voltages.
Danger
In the case of an ungrounded 3-phase power supply
(IT- Net), please note the relevant instructions in the
documentation supplied with the drive.
If a Residual Current Detector (RCD) is used as a
system ground fault monitor, only Type B (value
and delay adjustable) devices should be used to
avoid nuisance tripping.
33
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