CUMMINS ED-3 Manual de instalación descargar pdf (Pagina 30)

Natural Gas Generator Set Installation Manual-GF Series

Doc. 17855, Rel. 03/2014

4-4

cables—Disconnect negative (-) cable first and

reconnect last.

CAUTION

Disconnect battery charger from AC source

before disconnecting battery cables. Otherwise,

disconnecting cables can result in voltage spikes

damaging to DC control circuits of the set.

WARNING

Accidental starting of the generator set can cause

severe personal injury or death. Prevent acciden-

tal starting by disconnecting the negative (-)

cable from the battery terminal.

WARNING

Each of the operations described in this section

should be done only by persons trained and

experienced in electrical maintenance. Improper

procedures may result in property damage,

bodily injury or death.

Connecting the genset AC electrical system involves:

• Installation of transfer switch

• Generator output voltage selection

• Load cable connection

• Standard and optional AC equipment connec-

tions (e.g., control box heater, coolant heater,

etc.).

Local regulations often require that wiring connec-

tions be made by a licensed electrician, and that the

installation be inspected and approved before opera-

tion. All connections, wire sizes, materials used, etc.

must conform to the requirements of electrical codes

in effect at the installation site. Contractor guidelines

for appropriate conduit and wire sizing for this gener-

ator set can be found by referring to Figure 4-1.

WARNING

Improper wiring can cause a fire or electrocution,

resulting in severe personal injury or death and/

or property and equipment damage.

Before starting the genset, check to make sure that

all electrical connections are secure, and that all

wiring is complete. Replace and secure any access

panels that have been removed during installation.

Check that the load cables from the genset are prop-

erly connected.

Table 4-3

WARNING

Backfeed to utility system can cause electrocu-

tion or property damage. Do not connect to any

building electrical system except through an

approved device and after building main switch is

opened.

4.6 AC Wiring

4.6.1 Generator Voltage Connections

The available generator output voltages and

maximum current ratings are specified on the genera-

tor set nameplate. Line-to-neutral voltage is always

the lower voltage shown and line-to-line voltage is the

higher rating.

These generators can be configured to the name-

plate voltages as shown on the Reconnection

Diagram located in the generator manual supplied

with this equipment. Many of the voltages listed will

require reconfiguration of the generator output leads

on the connection terminal block. This reconfiguration

must only be done by service personnel that are

trained and experienced to perform electrical installa-

tion. The generator set was adjusted to produce a

specified voltage during production verification testing

Socket Size Across

Flats

Tightening Torque

mm inch N-m lb inches

3.2 1/8 5.1 45

4.0 5/32 11.4 100

4.8 3/16 13.8 120

5.6 7/32 17.0 150

6.4 1/4 22.6 200

7.9 5/16 31.1 275

9.5 3/8 42.4 375

12.7 1/2 56.5 500

14.3 9/16 67.8 600

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 66 67

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