Curtis 1204 User Manual

39
Curtis PMC 1204/1205 Manual
APPENDIX A
APPENDIX A
FUNCTIONAL DESCRIPTION
A-1
+14V
REGULATOR
UNDER
VOLTAGE
DETECT
SWITCH
PLUG DIODE
PLUG
DETECT
PULSE
WIDTH
MODULATOR
CURRENT
LIMIT
COMPARATORS
CURRENT
LIMIT
REFERENCE
CURRENT
LIMIT
DISABLE
SHUT
DOWN
GATE
DRIVE
LIMIT
INTEGRATOR
ACCELERATION
CIRCUIT
THROTTLE
INPUT
SCALING
HIGH
PEDAL
DISABLE
START-UP
TIMER
POT
FAULT
OVER
TEMP
UNDER
TEMP
TEMP
SENSE
POWER
SECTION
LOGIC SECTION
B+
A2
M-
B-
FREEWHEEL
DIODE
S1
S2
FIELD
+
FILTER CAPACITORS
OSCILLATOR
MOSFETs
A1
A2
+
–
ACCELERATION
RATE ADJUST
KSI
+14 VOLTS
TO ALL CIRCUITS
ARM
KEYSWITCH
and
INTERLOCKS
THROTTLE
POT
THROTTLE
INPUT
(SHADED AREA REPRESENTS CONTROLLER)
PLUG
CURRENT
ADJUST
CURRENT
LIMIT
ADJUST
(internal)
The controllers consist of a POWER SECTION and a LOGIC SECTION.
POWER SECTION
An array of paralleled power metal oxide semiconductor field effect transistors (MOSFETs)
switches pulses of current from the battery to the motor. During the interval when the MOSFETs
are off, the motor current continues to flow in the freewheel diode, which is actually a number of
paralleled fast recovery rectifiers. An array of filter capacitors connected directly across the battery
provides the instantaneous current required by the power switching circuitry and in this way
provides battery ripple current filtering and voltage spike suppression. The plug diode provides a
path for armature current to flow during plug braking of series motors. In versions of these
Fig. A-1 Block diagram, Curtis PMC 1204/1205 controllers.

Curtis 1204 Specifications

General

Brand	Curtis
Model	1204
Category	Controller
Language	English