Figure 11-16.--Nonreversing across-the-line starter for steering gear pump motor.

In an emergency you can run the motor (even

maintained-contact master switch (fig. 11-16). The

though the overload relays have been tripped) by

starter is supplied with 440-volt, 3-phase, 60-Hz power

holding the EM-RUN push button closed with the

from the steering power transfer switchboard located in

START push button in the operated position. If the

the steering gear room.

overload condition has not been corrected, the motor

The pump motor on either power unit is started or

will operate only as long as the EM-RUN push button

stopped by operating the maintained-contact push but-

is held closed.

ton on the associated push-button station to the desired

position. When the maintained-contact start push button

is pressed, the circuit is completed to the contactor

OPERATION AND MAINTENANCE

operating M coil of the line contactor. This action

energizes the operating M coil and closes the contactor

Operating instructions and system diagrams are

in the motor starter to connect the motor to the line.

normally posted near the steering gear. The diagrams

The motor will continue to run until the M coil is

describe the various procedures and lineups for

de-energized because of loss of voltage, tripping of the

operation of the steering gear.

overload relay, or pressing of the stop push button.

Maintenance should be performed according to

The motor starter is provided with overload and

your ship's PMS requirements for steering gears.

low-voltage release (LVR) protection. The overload

relays are of the thermal type, similar to those installed

SUMMARY

in the anchor windlass starter (discussed later in this

chapter under the operation of the destroyer anchor

windlass). The low-voltage release protection is pro-

In this chapter, you were given information on

vided by the maintained-contact master switch.

auxiliary equipment, including the components,

operating procedures, troubleshooting procedures,

If the operating M coil is de-energized due to failure

and maintenance procedures. You were also

of the line voltage or tripping of an overload relay, the

introduced to the fundamentals of cathodic protection

contactor will reclose and restart the motor when volt-

systems, including their operation, logs, and

age is restored or when the overload relays are reset by

maintenance.

the reset push button.

Figure 11-16.--Nonreversing across-the-line starter for steering gear pump motor.

11-20