Chapter 8. ELECTRIC UNIT COMPONENTS (Model RMP-J/ 11-1OE)

TM 5-4110-217-14

CHAPTER 8

ELECTRIC UNIT COMPONENTS (Model RMP-J/ 11-1OE)

8-1. General.

Assembly.

The 7.5 horsepower electric motor used on the

(1) Install the dust shields (10) and (13) on

Model RMP-J/11-1OE refrigeration unit is a 208-volt, 3-

the shaft and press the bearings (9) and (14) into place.

phase, 60-cycle, alternating current motor that requires

(2) Install the spring washer (15) in the end

25.3 amperes for proper opera-tion. The 213T type

bell (16).

motor operates at 1750 r.p.m. The electric motor is

(3) Install the rotor (12) in the end bell (16)

grounded. Rotation of the motor may be reversed by

and frame (21). Be careful not to damage the windings

reversing the position of any two power leads. A

or the rotor when installing the rotor.

magnetic starter is included in the electric system to

(4) Install the drive end bell (8) and secure it

control the operation of the motor. When the coil of the

with the brackets (5), screws (6) and nuts (7) e.

magnetic starter is activated, the contacts in the starter

Installation. Reverse

removalprocedure above to

close completing the electric circuit and energizing the

install the motor. After connecting the power source, turn

motor. An electrical connection box is supplied to

unit on momentarily to check direction of rotation. If

provide the means for disconnection and overload

direction of rotation is wrong, reverse the two power

protection of all power.

leads at any connection box.

CAUTION

Disconnect main power source

before

working

electrical

8-3. Starter Assembly.

components.

a. Removal (fig. 8-2).

NOTE

(1) Move the control switch on the control box

When connecting power leads or when

to "OFF" position. Disconnect the electrical power at

motor or starter have been disconnected

source.

always check for proper rotation when

(2) Remove four screws (3) holding access

reconnecting. To change rotation, reverse

cover

any two power leads.

(1) to box (19) and remove cover.

(3) Disconnect and tag all wire leads to

8-2. Electric Motor.

terminal block (8, fig. 8-3) and starter (5, fig. 8-3).

(4) Remove nut (7) and washer (6) to remove

Removal (fig. 8-1).

starter (5).

(1) Remove the electric motor (paragraph 3-

b. Repair (fig. 8-S).

22).

(1) Replace worn gaskets (2) on covers.

(2) Loosen screw (3) and remove the bushing

(2) Check fuses (13) and replace as

(1) and sheave (4) assembly from the motor shaft.

necessary.

b. Disassembly.

(3) Replace defective starter (5) or cracked

(1) Remove cap screws (6), brackets (5) and

terminal block (8).

nuts (7) that secure the end bells (8) and (16) to the

c. Assembly (fig. 8-2).

frame (21).

(1) Reassemble and mount all components

(2) Remove the rotor (12) with the bearings

per figure 8-3.

(9) and (14) attached.

(2) Connect wire leads to terminal block (8,

(3) Remove spring washer (15) from end bell.

fig.

(4) Using a suitable puller, remove the

8-3) and starter (5, fig. 8-3).

bearings and dust shields (10) and (13).

(3) Mount starter (5) with four nuts (7) and

c. Inspection and Testing. Test the rotor and field

washers (6).

windings for shorts, open circuits, grounding, burned

(4) Reassemble access cover (1, fig. 8-3)

insulation and inspect for damage to machined surfaces.

with screw and washer (3 and 4, fig. 8-3).

Replace motor assembly as a unit if rotor or windings are

(5) Reconnect electrical power at source.

defective. Refer to the manufacturer's data plate on the

(6) Move control switch on the control box to

motor for replacement bearings if they are required.

"ON" position.

NOTE

When replacing starter, check to make

sure starter reset button is In

automatic position

Change 3 8-1