DSE Model 5510 Autostart Control and Instrumentation System Operators Manual
057-015 5510 OPERATING MANUAL ISSUE 11 07/07/09 AM
76
Device
Description
52 ac circuit breaker
A device that is used to close and interrupt an ac power circuit under normal
conditions or to interrupt this circuit under fault or emergency conditions.
54
turning gear
engaging device
A device electrically operated, controlled, or monitored that functions to
cause the turning gear to engage (or disengage) the machine shaft.
55 power factor relay
A device that operates when the power factor in an ac circuit rises above or
falls below a predetermined value.
59 overvoltage relay
A device that operates when its input voltage exceeds a predetermined
value.
62
time-delay stopping
or opening relay
A device that imposes a time delay in conjunction with the device that
initiates the shutdown, stopping, or opening operation in an automatic
sequence or protective relay system.
63 pressure switch
A device that operates at a given pressure value or at a given rate of
change of pressure.
69
permissive control
device
A device with two-positions that in one position permits the closing of a
circuit breaker, or the placing of a piece of equipment into operation, and in
the other position, prevents the circuit breaker or the equipment from being
operated.
71 level switch
A device that operates at a given level value, or on a given rate of change
of level.
74 alarm relay
A device other than an annunciator, as covered under device function 30,
that is used to operate, or that operates in connection with, a visual or
audible alarm.
78
phase-angle
measuring relay
A device that functions at a predetermined phase angle between two
voltages, between two currents, or between voltage and current.
81 frequency relay
A device that responds to the frequency of an electrical quantity, operating
when the frequency or rate of change of frequency exceeds or is less than
a predetermined value.
83
automatic selective
control or transfer
relay
A device that operates to select automatically between certain sources or
conditions in equipment or that performs a transfer operation automatically.
86 lockout relay
A device that trips and maintains the associated equipment or devices
inoperative until it is reset by an operator, either locally or remotely.
90 regulating device
A device that functions to regulate a quantity or quantities, such as voltage,
current, power, speed, frequency, temperature, and load, at a certain value
or between certain (generally close) limits for machines, tie lines, or other
apparatus.
