Emerson VSG & VSSG Specifications download pdf (Page 22)

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Single Screw Compressor PLC Operation Manual •Vilter/Emerson • 35391CM

Section 1 • General Information

• All wiring to and from the Variable Frequency Drive

(VFD) starter shall conform to the National Fire

Protetcion Association 70 (NFPA-70), local codes and

the manufacturer’s guidelines and speciﬁ cations.

• Thoroughly read the manufacturer’s VFD installation

and instruction manuals.

• In the event of a code and manufacturer recom-

mendation conﬂ ict, always use the more stringent

standard.

• Only use an inverter duty rated motor built to NEMA

MG1 PART 30 & 31.

• Always used copper conductors to feed the VFD

starter and motor. Use cable with thermoset insula-

tion such as XLPE or XHHW-2 from the VFD to motor.

• It is preferred to use VFD cable, service wire company

or equal, between the VFD and the motor per manu-

facturer’s instructions.

• It is preferred to use continuous metal conduit to the

VFD starter to the motor.

• If non-metallic conduit is used, VFD cable must be

used.

• If using VFD cable in metal conduit, the metal con-

duit must be insulated at the motor, so that the metal

conduit is not a continuous run.

• Always use ﬂ exible metallic liquid-tight conduit to

feed the motor from metallic conduit.

• Grounding conductor must run from the VFD ground

terminals directly to the motor conduit box. Always

use proper grounding techniques (Star Method) and

sized according to the NFPA 70 NEC.

• Always use bonding bushings on all conduit ends,

with proper size braided copper cable bonded to the

starter panel.

• All grounding and bonding conductors and lugs must

terminate on bare metal and not to painted surfaces.

• Always use a minimum of 3% impedance line reactor

such as MTE or equal.

• Where the cables to the motor are longer than 50’,

always use a load reactor (customer must provide

Vilter with cable lengths from feeder to starter and

from starter to motor).

• Where the cables to the motor are longer than 500’,

always use a DV/DT load ﬁ lter (customer must pro-

vide Vilter with cable lengths from feeder to starter

and from starter to motor).

• Where the cables to the motor are longer than 1000’,

always use a sine ﬁ lter (customer must provide Vilter

with cable lengths from feeder to starter and from

starter to motor).

• Line and load conductors must be separated, as

much as the starter cabinet will allow, and cannot be

in the same conduit or cable chase.

• By no means shall power and control cables run in

parallel - cables must be separated, as much as the

starter cabinet will allow, and cannot be in the same

conduit or cable chase.

• For analog signals, use twisted shielded control cable

rated for 600V.

• When a generator is feeding a VFD starter, use a 5%

line reactor.

• Some countries require RFI/EMI ﬁ lters -- please con-

sult country codes and standards.

• As an insurance policy against motor shaft currents,

use a split ring bearing protection ring on the motor

shaft with the non-load bearing insulated.

VFD Installation Recommendations

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Emerson VSG & VSSG Specifications Page 22

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