18. Temperature & Motor Control Module R764203
OVL
PWR
DRIVE
MTR_SEL
DIR
SPD
M
A
B
Image 18-4
Motor drive
Two controlling signals are formed out of a direction signal and a speed signal. The latter is a PWM-signal that can reduce the
velocity of the motor by decreasing the duty-cycle. A switch at each end of the run will break the circuit and stop the motor but a
diode still enables the reverse direction. The current limiting circuit prevents the motor from overheating during an overload situation.
If this persists for more than three seconds then the current supply will be removed. This status can only be reset by selecting the
other direction or a different motor.
Motors with encoder issue two phase-shifted signals, which can be used to increment or decrement a counter, thus keeping track
of the relative position.
CHA2
CHB2
Image 18-5
Motor drive
PWM = Pulse Width Modulation: fixed frequency, varying duty-cycle (high/low ratio)
Controller
The voltages from the temperature-sensing circuits are converted with 8-bit ADC’s. These values are then used to turn on/off the
proper TEC-signals, and can be read out by the processor. When a DMD goes out of its operating temperature range for more than
two seconds, an interrupt request will be sent out to the processor in order to take actions to prevent damage of the DMD.
When receiving a motor command, the motor-selection and direction-signals are set and the duty-cycle of the speed-signal leaves
its zero-state. If the motor-command differs from the previous one then the overload-circuit will first be reset. An overload-signal
indicates the current-limiting status. The motor-selection-signals are also used to control the multiplexers for the encoder-signals,
so that only the position of the selected motor is considered
142
R5976820 SLM R12+ PERFORMER 08/03/2005
Summary of Contents for SLM R12 Plus
Page 1: ...SLM R12 Performer Service Manual R9010170 R9010171 R5976820 00 08 03 2005...
Page 8: ...Table of contents 6 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 12: ...1 Safety 10 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 36: ...5 SLM R12 P Location of the Fans 34 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 56: ...8 Local Keypad LCD Display 54 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 82: ...11 Signal Input Selection R763850 R763851 80 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 90: ...13 Digital Inputs Backplane R763378 88 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 126: ...15 Lamp Power Supply R7633705 124 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 130: ...16 Start Pulse Generator SPG R763512 128 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 168: ...22 Infra Red Receiver Module R763261 166 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 174: ...24 Projector Tilt Switch R764240 172 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 178: ...25 Light Output Sensor R763294 176 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 182: ...26 Lamp Info Module R763295 180 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 258: ...27 Maintenance 256 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 274: ...29 Overview of the Electrical Diagrams 272 R5976820 SLM R12 PERFORMER 08 03 2005...
Page 280: ...Index 278 R5976820 SLM R12 PERFORMER 08 03 2005...