Quantum ODYSSEY HF Series User Manual

Chapter 4 Theory of Operation
HF Series X-ray Generators - Service Manual Revision W
Quantum Medical Imaging 4-15
• TP3: -15V
•TP4: +5V
• TP5: Drive one side of the bridge (TTL)
• TP6: Drive second side of the bridge.
• TP7: Boost On (High TTL)
•TP8: High/Low Speed
• TP9: Rotor Run
• TP10: Over Voltage or Over Current (TTL Low = Fault)
•TP15: 36 kHz Clock
•TP17: +5V Reference
• TP19: Rotating Signal (Low = Tube Rotor rotating)
HSS Drive Board A20A2 (AY40-036S)
The main function of the HSS Drive Board A20A2 is to deliver AC drive volt-
ages to the rotor at 60 Hz and 180 Hz frequencies using a bridge driver cir-
cuit. To protect the bridge driver circuit, the HSS Drive Board contains fault
detection and overload protection circuits.
The DC voltage for the bridge is provided by Bridge Rectifier A20A2BD30. A
set of relays located on HSS Control Board A20A1 control the AC voltage sup-
ply to Bridge Rectifier A20A2BD30 based on the operational state of the high
speed starter (i.e., High/Low Speed Boost, Run, or Brake). Capacitors
A20A2C4, -C5, -C8, and -C9 filter the rectified DC voltage.
The drive for the bridge driver is input from HSS Control Board connector J1
into HSS Drive Board A20A2 connector J3. The drive is monitored on test
points A20A2TP5 and A20A2TP1.
Relay A20A2K1 sets the value of the rotor phase capacitors in accordance
with the speed at which the high speed starter is operating. The values phase
capacitors will be set based on the tube type.
A triple-output floating power supply provides power to the HSS Drive Board
IGBT drivers. The switching power supply pulse-width modulated (PWM) out-
put provides a pulse that is a function of the voltage. The output of the PWM
can be monitored at test point is A20A2TP12. The feedback test point is
A20A2TP13. The voltage at this point is 18 VDC.
For protection against overload of the bridge circuit output, current sensors
monitor output current (available at test points A20A2TP2 and A20A2TP6). If
current exceeds maximum threshold level, the high speed starter shuts down
the rotor and an Over Current/Voltage signal is output to HSS Control Board
A20A1. Similarly, the Main to Common voltage is monitored at test point
A20A2TP14 (sample of the output voltage). If the voltage exceeds a preset
voltage threshold, the high speed starter shuts down the rotor and an Over

Quantum ODYSSEY HF Series Specifications

General

Brand	Quantum
Model	ODYSSEY HF Series
Category	Medical Equipment
Language	English