Glossary - Zener MSC-3 Instruction Manual

Glossary

~STOP
2-wire control
3-wire control
COM
AWG
Console
Constant Torque
DC Bus Choke
EMC
EN
ESO
HVAC
IEC
IN+, IN-
JOG
LATCH
Local
NEMA
PF
PID
PID, reverse acting
Ramp
Remote
RMS
The logical inverse of STOP. This circuit must be closed for the MSC-3 to run.
Control of the stop / start function by a simple contact closure (eg a start / run
switch contact).
Control of the stop / start function by momentary contacts, typically separate
start and stop pushbuttons. This arrangement has the advantage of preventing
an inadvertent re-start following a power outage.
The common terminal to which all inputs on the MSC-3 are referenced.
American Wire Gauge
The pushbuttons and LCD display on the front of the MSC-3
A load characteristic in which the driving torque requirement is largely
independent of speed. e.g. a horizontal conveyor
An inductor connected in series with the DC bus inside the MSC-3. This
provides several benefits including reducing the harmonic content of the AC line
current.
Electromagnetic Compatibility. The arrangement of emission and immunity
levels to achieve functional coexistence between various items of equipment in
a given environment.
The enable input on the MSC-3.
Essential Services Override. A mode of operation that disables certain
protection features in order to allow the MSC-3 and/or the motor to run to
destruction in certain circumstances, for example clearing smoke from a
building.
Heating, Ventilation and Air Conditioning [industry]
International Electrotechnical Commission, publisher of many standards related
to electrical / electronics technology.
These are the designations of differential analog inputs on the MSC-3. The
MSC-3 will respond to the difference between the two inputs, rather than the
voltage between either input and AN COM.
A control input that causes motion only while it is active (ie non-latched) that is
usually used to manually operate equipment for the purposes of setting up or
alignment prior to continuous operation.
A feature of a control input that requires only a momentary signal (e.g. contact
closure) to provide sustained (latched) operation.
Operation of the MSC-3 from the console pushbuttons on the enclosure.
[The American] National Electrical Manufacturer's Association, publishers of
various NEMA standards.
Power factor. The ratio of real (active or in-phase) current to the total current in
an AC circuit.
A type of automatic controller that seeks to drive a measured value (e.g.
temperature, pressure etc) to a preset value by means of a control effort (e.g.
motor speed) determined by proportional, integral, and derivative functions.
A PID control system in which an increase in control effort (e.g. motor speed)
results in a decrease in the measures variable (e.g. temperature). A common
example is a cooling tower where an increase in fan speed causes a reduction
in water temperature.
A control function within the MSC-3 that controls the rate at which the motor
speed can increase or decrease.
Operation of the MSC-3 via connections made to the control board terminal
strip.
Technically, Root-Mean-Square. A method of measuring an AC voltage or
current that gives the same numerical result as a DC voltage or current would
on the basis of heating effect.
IM00120 IM00120
MSC-3 Instruction Manual
141