EN
12
80448608 Rev B
INSTALLATION
The phase-to-phase voltage is the same as the primary
supply voltage (575, 480, 460, 440, 415, or 380 volts).
NOTICE
You must disconnect the two electro-magnetic
compatibility (EMC) filters in a wye network that has a
high resistance neutral connection more than 30 ohms.
See “Disconnecting the Electro-Magnetic Compatibility
(EMC) Filters” .
In an ungrounded delta connected network:
The network is capacitively grounded.
Stray capacitances are connected between each phase
conductor to ground.
All phase voltages to ground are approximately 277 volts
for a 480-volt network.
There can be many different indications because of the
capacitive ground.
The phase-to-phase voltage is the same as the primary
supply voltage (575, 480, 440, or 380 volts).
The primary function of an ungrounded delta network is
to let uninterrupted power occur during a ground fault. At
this time, the ungrounded network is referenced to ground.
The primary circuit breaker opens only when two phases are
connected to ground. Thus, it is possible to have one of the
three phases of an ungrounded delta network connected
to ground or the network be ungrounded at the time of
compressor installation, but have a grounded phase at a
future time.
NOTICE
You must disconnect the two electro-magnetic
compatibility (EMC) filters in a delta network that is
not grounded. If you do not do this, damage will occur
to the filter and to the VSD. This voids the factory
warranties. See “Disconnecting the Electro-Magnetic
Compatibility (EMC) Filters”.
In a delta connected network:
Only two phases to ground have a voltage, while the
third phase has zero volts. The phase with zero volts is
grounded.
The two ungrounded phase voltages are the same as
the primary supply (480 volts to ground for a 480-volt
system).
The phase-to-phase voltage is the same as the primary
supply voltage (480, 440, or 380 volts).
NOTICE
With all compressors that have a variable speed drive
for the primary drive, connect the ground to the
L2 input of the compressor. If you do not obey this
procedure, the compressor does not operate.
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NOTICE
If you find a grounded phase during installation, it is
important to know if the grounded phase is intentional
(grounded) or accidental (ungrounded with a ground
fault condition present).
Table 2: Input Voltage Rating
Nominal voltage rating (VAC)
380-460
Phase
3
Hertz
50/60
Min./Max. Voltage Tolerance(%) 400-460 V
± 10
380 V
+10, -6
Min. /Max. Voltage Imbalance Between Phases
(%)
3
Min./Max. Frequency Tolerance (%)
± 5
NOTICE
Ratings that do not fall in these limits can cause damage
to the compressor and make all factory warranties void.
High Voltage Conditions and Secondary
Protection
A compressor with a variable speed drive contains metal
oxide varistors (MOV). The MOV prevent damage to the VSD
from typical voltage conditions. Very high voltage conditions
can cause damage to the MOV and the VSD. These are
examples of very high voltage conditions:
lightning storms
switching of power factor capacitors
welders
thyristors
If there are very high voltage conditions, you must add
secondary protection to prevent damage to the compressor.
NOTICE
Damage to the MOV shows that the compressor was
exposed to very high voltage conditions.
Damage to the MOV because of very high voltage
makes the factory warranty and the extended contract
warranty void.
Power Factor Compensation Capacitors
Power factor compensation is not necessary for a compressor
that contains a variable speed drive. Nevertheless, if
you connect the compressor to a system that includes
compensation capacitors, obey these instructions:
Do not connect a high-power capacitor to the power
line while the compressor is connected to the primary
power. High voltage conditions can open the compressor
protection circuits or they can cause damage to the
compressor.
If you increase or decrease the capacitor load gradually
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RELEASED 06/Feb/2018 13:48:37 GMT
