Identifying Relays 1.0
Define a SSOLR.
What is an electronic device that provides overload protection for electrical equipment.
What is open circuit transition is a method in which the motor being controlled may be disconnected temporarily from the source of voltage while moving from one to another. (V)
What is the most common method of matching motor speed to the needs to the equipment or machinery?
What is to change the frequency coming to the motor in the AFD.
Explain friction braking.
What is braking force dependent on motor speed. Doesn't require operational power source, braking energy is dissipated as heat.
Zero on (DMM) would indicate what?
What is a good fuse.
How is an SSOLR mounted in the enclosure?
What is standalone mounting, starter mounting, and DIN-rail.
Describe an autotransformer reduced-voltage starters.
What is fluting?
What is parasitic or stray voltages, and electrical discharge machining of the bearing races, typically in the form of parallel grooves.
What is AFD?
What is adjustable frequency drive.
Ammeter is used to measure what?
Two types of SSOLRs, what are they?
What is programmable SSOLR, and nonprogrammable SSOLR.
Define NCTO.
What is Normally Closed Timed Open.
What is slip?
What is fail-safe?
What is a holding brake, and advantage of friction brakes over any others, is cost.
When measuring a relay coil/contactor what reading is bad?
What is zero ohms reading means a shorted coil, infinite resistance indicates an open coil.
What is an off-delay relay provides the time delay after the relay is de-energized.
Two types of motor connections, what are they?
What is wye start, and delta run.
What is a constant torque load? Give 2 examples.
What is speed independent , friction type loads, such as hoists, conveyors, printing press, wood chipper, positive displacement pump, and extruders.
Describe BR.
What is a braking relay
Contacts that are open when the contactor/relay is energized are called?
What is normally closed contacts.
Two types of relays used with base, what are they?
What is 8-pin, and 11-pin relays.
What type of loads are soft-start? Choose two.
What is conveyors, compressors, and pumps.
List the six properties off a nameplate?
What is voltage, frequency, base speed, current, service factor, and power factor.
Describe DC injection braking.
What does IGBT stand for?
What is insulated gate bipolar transistor.