TABLE V: PROPULSION SYSTEM COMPONENTS DESCRIPTION (Cont.)
REF.
NO.
COMPONENT FUNCTION
PSC 32
Propulsion System Controller
(17FL320)
The PSC is the main controller for the AC drive system.
All propulsion and retarding functions are controlled by
the PSC based on internally stored software instructions.
PM1A+, 1B+, 1C+ 13 GTO Phase Modules (17FM628)
Provide positive driving voltages (PWM or square wave,
depending on truck speed) for each of the three windings
of Traction Motor 1.
PM1A-, 1B-, 1C- 12 GTO Phase Modules (17FM629)
Provide negative driving voltages (PWM or square wave,
depending on truck speed) for each of the three windings
of Traction Motor 1.
PM2A+, 2B+, 2C+ 15 GTO Phase Modules (17FM628)
Provide positive driving voltages (PWM or square wave,
depending on truck speed) for each of the three windings
of Traction Motor 2.
PM2A-, 2B-, 2C- 14 GTO Phase Modules (17FM629)
Provide negative driving voltages (PWM or square wave,
depending on truck speed) for each of the three windings
of Traction Motor 2.
RD 2 Rectifier Diode Panel (17FM528)
Converts Alternator 3-phase, AC voltage to DC voltage to
power the two Inverters.
RG1A, 1B, 1C, 2A,
2B, 2C, 3A, 3B,
3C, 4A, 4B, 4C,
5A, 5B, 5C
64 Retard Grid Resistors
Dissipate power from the DC link during retarding, load
box testing, and Inverter Filter Capacitor discharge
operations.
RP1, 2, 3 47
Retard Contactors 1, 2 and 3
(17CM55)
When closed, connects Grid Resistors to the DC link
during retarding, load box testing, and Inverter Filter
discharge operations.
RP1S, 2S, 3S 55 Suppression Modules
Suppresses voltage spikes in coil circuit when RP
contactors are de-energized.
RSN1, 2 Snubber Resistors
Provide a current path for the associated Chopper
Module filter capacitors.
RS1A, 1B, 1C, 2A,
2B, 2C
Snubber Resistors
Provide a current path for the associated Phase Module
filter capacitors.
R1
51
Battery Boost Resistor
Limits surge current in the Alternator field circuit when
GFR contacts first close.
AUX SNUB 25 Snubber
Suppresses voltage spikes in Aux Blower Motor circuit.
SPS
37
Power Supply (17FH36)
A DC to DC converter which provides regulated ±24 VDC
outputs from the unfiltered battery supply.
SS1, 2 Traction Motor Speed Sensors
Each speed sensor provides two output speed signals,
proportional to the Traction Motor’s rotor shaft speed.
SYS CPU Card
System Central Processing Unit
Card (17FB147)
Provides control of propulsion and dynamic retarding
functions, battery backed RAM, real-time clock,
downloadable code storage, and an RS422 serial link.
E02014 3/01 Electrical Propulsion System Components E2-45
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