CUMMINS ED-3 Manual de instalación descargar pdf (Pagina 31)

Natural Gas Generator Set Installation Manual-GF Series

Doc. 17855, Rel. 03/2014

4-5

prior to shipment. The installer must always check the

stator lead terminal block connections and perform

any necessary reconnect to obtain the voltage

required. Refer to applicable Alternator Installation,

Service & Maintenance Manual as identified in Table

4-4 .

Table 4-4

Some generator sets are capable of producing a wide

range of voltages and connection configurations,

others have specific limited capabilities. Refer to

wiring diagram and generator voltages (from the

nameplate) when reviewing the voltage connection

information and use the wiring diagram supplied with

your generator set when actually performing load

connections.

CAUTION

Reconfiguring generator sets to higher voltages

can exceed the voltage capability of the specific

generator windings. This will damage the genera-

tor, decrease line current, and render line circuit

breakers too large. Consult with your distributor

before performing reconnection for a different

voltage.

CAUTION

Reconfiguring generator sets to lower voltages

can reduce generator set ratings, and also

increase line current, rendering line circuit break-

ers too small. Consult with your distributor before

performing reconnection for a different voltage.

4.6.2 Load Connections

Flexible conduit and stranded conductors must be

used for connections to take up movement of the

generator set.

All loads are connected to the generator by bolting

stranded load wires to the appropriate terminals on

the generator reconnection terminal block or circuit

breaker lugs. The terminals are stamped U, V, W and

N to indicate the line and neutral connections. (Refer-

ence: U, V, and W correspond with L1, L2 and L3;

and N with L0 respectively).

4.6.3 Load Balancing

When connecting loads to the generator set, balance

the loads so the current flow from each line terminal

(L1, L2 and L3) is about the same. This is especially

important if both single phase and three phase loads

are connected. Any combination of single phase and

three phase loading can be used as long as each line

current is about the same, within 10 percent of

median value and no line current exceeds the name-

plate rating of the generator. Check the current flow

from each line after connections by observing the

control panel display.

4.6.4 Current Transformers

The CT’s must be installed as noted in the following

CT Installation Requirements.

Refer to the reconnection diagram to identify the

output leads/phase that must be routed through each

CT, and also appropriate transformer post selection

for meter sensing leads. The transformers are labeled

CT1, CT2 and CT3 on the reconnection wiring dia-

gram. (The reconnection diagram is located on the

upper side cover of the control housing.)

CT Installation Requirements:

The CT has a dot on one side. This dot must be

facing toward the generator (conventional current

flowing into the dot). A dot is also used to indicate pin

1 of the CT.

a. CT1 - U load leads (A phase)

b. CT2 - V load leads (B phase)

c. CT3 - W load leads (C phase)

d. Route the appropriate load wires through

each CT. The CT’s have dual secondaries (3

posts). The CT secondary wire marked 1 is

connected to post 1 of the CT. CT secondary

wire marked 2/3 is connected to post 2 for

high voltage gensets or to post 3 for low

voltage gensets. (Refer to the Reconnection

Diagram in Section 7 - Wiring Diagrams.)

Description Application

Part

Number

Alternator Installation,

Service and Mainte-

nance Manual

UCI, UCM,

UCD 224 &

274

UCH-027

Alternator Installation,

Service and Mainte-

nance Manual

HCI Series UCI-056

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 66 67

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