Motor controllers and remote control

46 CFR §111.70-3

§ 111.70-3 -3 Motor controllers and motor-control centers. (a)The enclosure for each motor controller or motor-control center must meet either NEMA ICS 2 and NEMA ICS 2.3, or Table 1 of IEC 60092-201:2019 (all incorporated by reference; see § 110.10-1 of this subchapter), as appropriate, for the location where it is installed. In addition, each such enclosure in a hazardous location must meet the requirements of subpart 111.105 of this part. NEMA ICS 2.4 (incorporated by reference; see § 110.10-1 of this subchapter) provides guidance on the differences between devices meeting NEMA and those meeting IEC for motor service. (b)Each motor controller for a fire pump, elevator, steering gear, or auxiliary that is vital to the vessel's propulsion system, except a motor controller for a vital pr…

46 CFR §111.70-7

§ 111.70-7 -7 Remote control, interlock, and indicator circuits. (a)A conductor of a control, interlock, or indicator circuit of a motor controller must be protected against overcurrent unless: (1) The conductor is wholly within the controller enclosure; (2) The rating or setting of the branch circuit overcurrent device is not more than 300 percent of the current-carrying capacity of the control, interlock, or indicator circuit conductor; (3) There is an overcurrent device in each side of the line that has a rating or setting of not more than 300 percent of the current-carrying capacity of the control, electrical interlock, or indicator circuit conductor, except if under operating conditions there is no appreciable difference in potential between the external conductors, overcurrent pr…

NAVEDTRA 14104 Ch. 12 — Controllers

Controlling devices are used to start, stop, speed up, or slow down motors. In general, these controllers are standard equipment aboard ship and are operated either manually, semiautomatically, or automatically. They are dripproof and shock resistant. In some installations, the controllers are operated by remote control, with the switch at a convenient location. Motor control devices (controllers, master switches, and electric brakes) protect the equipment to which they are connected. Controllers provide protective and governing features for every type of shipboard auxiliary. Various types of master switches are used to govern the controllers. Electric brakes are used to bring a load to rest, or to hold it at rest, when electric power to the motor is cut off. Aboard ship, electric brakes …

NEETS Mod. 3 §3-2

Relays, solenoids, and motor controllers A relay is an electromagnetically operated switch: energizing a low-power coil produces a magnetic field that pulls an armature to open or close separate, often higher-power, contacts, allowing a small control signal to switch a large load and providing electrical isolation between control and power circuits. A solenoid is a similar electromagnet whose plunger produces linear motion to operate valves, brakes, or clutches. A contactor is a heavy-duty relay for switching motor and heater loads. The motor controller (motor starter) combines a contactor with overload protection: thermal overload relays sense sustained excess motor current (via heaters or electronic sensing) and open the control circuit to drop out the contactor before the motor overhea…