Zener MSC-3 User Manual

IM00120
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IM00120
MSC-3 Instruction Manual
Glossary
~STOP The logical inverse of STOP. This circuit must be closed for the MSC-3 to run.
2-wire control Control of the stop / start function by a simple contact closure (eg a start / run
switch contact).
3-wire control 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.
COM The common terminal to which all inputs on the MSC-3 are referenced.
AWG American Wire Gauge
Console The pushbuttons and LCD display on the front of the MSC-3
Constant Torque A load characteristic in which the driving torque requirement is largely
independent of speed. e.g. a horizontal conveyor
DC Bus Choke An inductor connected in series with the DC bus inside the MSC-3. This
provides several benets including reducing the harmonic content of the AC line
current.
EMC Electromagnetic Compatibility. The arrangement of emission and immunity
levels to achieve functional coexistence between various items of equipment in
a given environment.
EN The enable input on the MSC-3.
ESO 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.
HVAC Heating, Ventilation and Air Conditioning [industry]
IEC International Electrotechnical Commission, publisher of many standards related
to electrical / electronics technology.
IN+, IN- 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.
JOG 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.
LATCH A feature of a control input that requires only a momentary signal (e.g. contact
closure) to provide sustained (latched) operation.
Local Operation of the MSC-3 from the console pushbuttons on the enclosure.
NEMA [The American] National Electrical Manufacturer’s Association, publishers of
various NEMA standards.
PF Power factor. The ratio of real (active or in-phase) current to the total current in
an AC circuit.
PID 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.
PID, reverse acting 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.
Ramp A control function within the MSC-3 that controls the rate at which the motor
speed can increase or decrease.
Remote Operation of the MSC-3 via connections made to the control board terminal
strip.
RMS 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.

Zener MSC-3 Specifications

General

Brand	Zener
Model	MSC-3
Category	Controller
Language	English