Cutler-Hammer GMCP Kurulum Talimatları - Sayfa 3

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I.L. 15579B

torque loading. Torque values for line/load terminals

are given in Tables 2.1 and 2.2 and on the MCP name-

plate.

Table 2.1 Terminal Types

For line and load-side. Terminals are UL Listed as suit-

able for wire type and size given below.

Circuit

Terminal

Screw

Breaker

Type

Head

Amps.

Material

Type

3-20

Clamp

Slotted

(Plated Steel)

25-63

Pressure

Slotted

(Aluminum Body)

Not UL Listed sizes.

Table 2.2 Terminal Torque Values

AWG Wire

Torque

Range

Value lb-in

#14-10

#6-1/0

3-0 MANUAL OPERATION

The MCP is manually operated by the handle or the

PUSH-TO-TRIP button. The MCP handle has three

indicating positions, two of which are shown with handle

lettering to indicate ON and OFF. Trip status is indicat-

ed by white strip on handle.

Circuit Breaker Reset

After tripping, the MCP is reset by moving the MCP han-

dle to the extreme OFF position.

PUSH-TO-TRIP Button

The PUSH-TO-TRIP button checks the tripping function

and is used to periodically exercise the operating mech-

anism. The button is designed to be operated by using

a small screwdriver.

Adjustment of Trip Setting

The trip setting adjusting mechanism permits the MCP

to be fine tuned to provide more precise protection. The

mechanism consists of a cam with six positions for dif-

ferent trip levels. The trip levels are labeled A through

F; actual trip values are shown on the MCP cover name-

plate and in Tables 3.1. Adjustments is made only in

one direction as indicated in Figure 3-1. A rotation stop

Effective 12/98

Wire

AWG Wire Metric

Type

Range

Wire

Range (mm

Cu/Al

#14-10

1.5-4

Cu/Al

#10-1/0

4-50

Torque

Value N.m.

2.26

4.52

5.09

TRIP

OFF

)

RESET

Push to Trip

Button

Figure 3-1 MCP Manual Controls

prevents the adjustment wheel from being rotated

against indicated adjustment direction. The MCP can

be damaged if adjustment is forced against indicated

adjustment direction. Once the F setting has been

reached, continue adjusting in the same direction to

return to the A setting. To adjust the trip level, perform

the following steps:

3-1. Determine the motor full load current from the

motor nameplate. Refer to Table 3.1 and select appro-

priate MCP trip setting. Using a small screwdriver,

rotate wheel in direction indicated (See Figure 3-1) to

the appropriate setting.

3-2. For closest protection, turn the adjustment wheel to

successively lower settings until the MCP trips when the

motor is started. Only adjust in direction indicated (See

Figure 3-1). When this setting has been determined,

turn the adjustment wheel to the next highest setting.

The MCP is now adjusted for normal operation.

3-3. If the MCP does not trip at the lowest setting (A),

leave the adjustment wheel at this position.

4-0 INSPECTION AND FIELD TESTING

G-Frame MCPs are designed to provide years of almost

maintenance-free operation. The following procedure

describes how to inspect and test a MCP in service.

Inspection

MCPs in service should be inspected periodically. The

inspection should include the following checks:

Trip Indicator:

White Color

Handle

When Tripped

Trip Setting

Adjustment Mechanism

Adjust Only In

Direction Shown By

Arrow

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