Red Lion MDC - Manual (Page 6)

GENERAL DESCRIPTION
The Motor Drive Controller (MDC) accurately regulates motor speed by
varying an isolated DC control signal to a motor drive system. There are two
modes of operation, Master and Follower.
Master Mode provides control of a motor directly via programmed speed
setpoints in the MDC. Regulation is maintained by means of a feedback
frequency to the MDC taken from the motor shaft or a downstream shaft pulse
encoder. Follower Mode controls a motor’s speed as a ratio to a second
motor’s speed or outside frequency source. The MDC is a “speed” follower. It
does not track the lead motor’s position. Ratio setpoints are programmed into
the unit causing the motor to “follow” the lead motor’s speed at a fixed ratio.
The MDC has two programmable speed setpoints and two ramp setpoints
in master mode. Follower Mode has two ratio setpoints and two ramp
setpoints. Both modes share a jog speed setpoint and a jog ramp setpoint. All
setpoints are retained in non-volatile memory when the unit is powered down.
There are five dedicated control inputs on the MDC:
RUN
RAMP STOP
FAST STOP
JOG
OPEN LOOP
There are six programmable control inputs: two front panel function keys
and four remote User Inputs. The F1 and F2 keys are factory programmed for
RUN and R-STOP respectively. This eliminates the need for external
switches in some applications.
There are three solid state outputs, two are programmable and one is a
dedicated DRIVE ENABLE output. Programmable functions include:
HIGH ALARM
LOW ALARM
DEVIATION ALARM
ZERO SPEED
DISABLED
Outputs may be programmed for boundary or latching operation, and high
or low acting. There are also two programmable alarm update rates, Normal
and Fast.
Application flexibility is provided through the two-line by eight-character
alphanumeric display. The display features English language menus for easy
viewing and simplified programming. The four scroll-through Indication
Displays can be programmed to show various parameters and to
automatically scroll, if desired. A program disable DIP switch used with an
external User Input can be utilized to protect the settings and guarantee that
no unwanted changes occur during operation.
Changing speed setpoints and programming information is easily
accomplished by scrolling through menus and selecting the correct
parameter. There are three main Modules:
INDICATION DISPLAY MODULE
USER SETPOINTS MODULE
PROGRAMMING MODULE
Scaling is accomplished by entering the number of feedback pulses per
revolution (PPR), the maximum RPM, and the maximum display units. The
MDC is factory configured for an isolated 0 to 10 VDC drive output signal.
The drive output signal can be adjusted to span from 0 to a maximum of 5
through 15 VDC via an accessible potentiometer. The drive output is jumper
selectable for an external reference voltage. To use the external reference, the
MDC is connected to the drive in place of an external speed potentiometer.
The construction of the MDC unit is a lightweight, high impact plastic case
with a clear viewing window. The sealed front panel with the silicone rubber
keypad meets NEMA 4X/IP65 specifications for wash-down and/or dusty
environments, when properly installed. Plug-in style terminal blocks
simplify installation and wiring change-outs.
SAFETY SUMMARY
All safety related regulations, local codes and instructions that appear in
the manual or on equipment must be observed to ensure personal safety and to
prevent damage to either the instrument or equipment connected to it. If
equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
Do not use this unit to directly command motors, valves, or other actuators
not equipped with safeguards. To do so, can be potentially harmful to persons
or equipment in the event of a fault to the unit.
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