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LOGIC SECTION
+10V REFERENCE
+10V
REGULATOR
START-UP
THROTTLE
THROTTLE
INPUT
THROTTLE
POT
AUXILIARY
SECTION
KEYSWITCH
and
INTERLOCKS
KSI
PTC
FWD
INPUT
PTC
DIRECTION
SWITCHES
REV
INPUT
PTC
E. REV.
INPUT
Block diagram, Curtis PMC 1204X/1205X/1209/1221 controllers.
Fig. A-1
These controllers consist of three sections: (1) a
power section, and (3) an
Curtis PMC 1204X/1205X/1209/1221 Manual
APPENDIX A
FUNCTIONAL DESCRIPTION
(SHADED AREA REPRESENTS CONTROLLER)
+14V
REGULATOR
UNDER
VOLTAGE
DETECT
SWITCH
TIMER
+14 VOLTS
TO ALL CIRCUITS
HIGH
PEDAL
DISABLE
LIMIT
ACCELERATION
INPUT
INTEGRATOR
CIRCUIT
SCALING
PULSE
POT
DISABLE
FAULT
ACCELERATION
RATE ADJUST
PLUG CURRENT
PLUG
LIMIT
CURRENT
REFERENCE
ADJUST
VARIABLE PLUG
EMERGENCY REVERSE
PLUG
(+10V REFERENCE)
BOARD
CHECK
SIGNAL
CONDITIONING
SIGNAL
CONDITIONING
SIGNAL
FAULT
CONDITIONING
INHIBIT
AUXILIARY SECTION
OVER
VOLTAGE
DETECT
PLUG
DETECT
SHUT
OSCILLATOR
DOWN
PULSE
GATE
WIDTH
DRIVE
MODULATOR
CURRENT
CURRENT
LIMIT
LIMIT
COMPARATORS
DISABLE
CURRENT
OVER
LIMIT
TEMP
REFERENCE
FIXED PLUG
UNDER
TEMP
CURRENT
LIMIT
ADJUST
LOGIC
+12 VOLTS
POWER-ON
RESET
CONTROL
LOGIC
BYPASS
OVER
TIMER
CURRENT
CONTROL
INHIBIT
FAULT
RELEASE
DETECT
TIMER
, (2) a
POWER SECTION
, which enables and monitors the power and logic sections.
APPENDIX A
POWER
SECTION
B+
A2
M-
+
B-
TEMP
SENSE
+12V
REGULATOR
F/R
F/R CONT.
CONTACTOR
OUTPUT
DRIVER
CURRENT
SENSE
BYPASS
BYPASS
CONTACTOR
CONT.
DRIVER
OUTPUT
CURRENT
SENSE
, which drives the
LOGIC SECTION
A1
ARM
A2
S1
S2
+
–
F/R
CONTACTORS
BYPASS
CONTACTOR
A-1
43
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