How To Find Which System Is Used; High Voltage Conditions And Secondary Protection; Power Factor Compensation Capacitors - Ingersoll Rand R30 Information De Produit

93014.15.06
EN


How to Find Which System Is Used

Use a multimeter to measure the voltage. All voltage indications can
change plus or minus 10%.
In a grounded wye connected 480-volt network:
• Each phase to ground (neutral) voltage is approximately 277 volts (480/
sqrt3).
• 277 volts is a nominal indication for 480 volt systems.
• Other voltage indications are possible for 380, 415, 440 and 575 volt
systems. See Table 2.
• The phase-to-phase voltage is the same as the primary supply voltage
(575, 480, 460, 440, 415, or 380 volts).
You must disconnect the two Electro-Magnetic Compatibility (EMC)
fi lters 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 diff erent 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.
You must disconnect the two Electro-Magnetic Compatibility (EMC)
fi lters in a delta network that is not grounded. If you do not do this,
damage will occur to the fi lter 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).
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.
If you fi nd 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).
EN-6
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Table 2 : Input Voltage Rating
Nominal Voltage Rating (VAC)
Phase
Hertz
Min./Max. Voltage Tolerance (%) 400-460 V
380 V
Min. /Max. Voltage Imbalance Between Phases (%)
Min./Max. Frequency Tolerance (%)
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.
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 when the
compressor is connected to the power line, make sure the connection
steps are suffi ciently low not to cause voltage transients that can open
the compressor protection circuits or cause damage to the compressor.
• Check that the power factor compensation unit is correct for use in
systems with AC drives. The compensation unit must typically have a
blocking reactor or harmonic fi lter.
• Do not connect any devices to the output of the AC drive in the
compressor.
If you do not obey the electrical installation instructions, the factory
warranty and any extended contract warranty is void.
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Disconnecting the Electro-Magnetic Compatibility (EMC) Filters
On some types of electrical power systems, you must disconnect the
internal Electro-Magnetic Compatibility (EMC) fi lters. If you do not do this,
the electrical power system is connected to ground potential through the
EMC fi lter capacitors. This can cause a dangerous situation and it can cause
damage to the variable speed drive.
380-460
3
50/60
± 10
+10, -6
3
± 5
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80447162 Rev B