Motor controllers and remote control

46 CFR §111.70-1

§ 111.70-1 -1 General. (a) Each motor circuit, controller, and protection must meet the requirements of sections 4-8-2/9.17, 4-8-4/9.5 and 4-8-3/5 of ABS Marine Vessel Rules; sections 6-1-7/9.9 and 6-1-7/9.15 of the ABS MOU Rules; or IEC 60092-301:1980 (all three standards incorporated by reference; see 46 CFR 110.10-1), as appropriate, except for the following circuits: (1) Each steering gear motor circuit and protection must meet part 58, subpart 58.25, of this chapter. (2) Each propulsion motor circuit and protection must meet subpart 111.35 of this part. (b) In ungrounded three-phase alternating current systems, only two motor-running protective devices (overload coil or heater type relay within the motor and controller) need be used in any two ungrounded conductors, except when a …

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…

46 CFR §111.95-3

§ 111.95-3 -3 General requirements. (a) Each electrical component (e.g., enclosure, motor controller, or motor) must be constructed to the appropriate NEMA or IEC degree of protection requirement for the service and environment in which it is installed. (b) Each main line emergency disconnect switch, if accessible to an unauthorized person, must have a means to lock the switch in the open-circuit position with a padlock or its equivalent. The switch must not lock in the closed-circuit position. [CGD 94-108, 61 FR 28283, June 4, 1996]

NEETS Mod. 3 §3-2

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 befo…

NEETS Mod. 5 §2-2

NEETS Mod. 5 §2-2 — DC motor types and starting Like generators, DC motors are series, shunt, or compound wound, and the connection sets the speed-torque character. A series motor has very high starting torque and draws heavy current at low speed but its speed varies widely with load and it will overspeed dangerously if unloaded, so it is used for starters, hoists, and traction where it is never run unloaded. A shunt motor runs at nearly constant speed from no load to full load and gives moderate starting torque, suiting it to driving pumps, fans, and machine tools where steady speed matters. A compound motor blends the two: good starting torque from the series field with better speed regulation from the shunt field, used for loads with sudden torque demands like compressors and some winc…