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REV.-A
Each block in the PF
motor drive circuit is described below.
1. Phase Drivers (A to D)
These drivers are turned on and off upon receiving the drive pulses A02 to D02 from the
(4 B).
When the input signal is HIGH, the corresponding phase driver turns on.
2. PF
Motor Power Switches (A/C phase and B/D phase)
This switch is turned on and off upon receiving the output from
1
When the output from
the
is HIGH, +35 V is applied to
3. Current Detection Resistors
end
Voltage is induced across the current detection resistors in proportion to the current that flows to the
PF motor coil. The voltage is input to the minus terminal of
4.
Reference Voltage Circuit
The current applied to the PF motor coil is determined by the reference voltage applied to the plus
terminal of
or
5.
and
1 or
compares the reference voltage at the plus terminal to the voltage applied to the minus
terminal, which is from the current detection resistor
or
When the reference voltage is lower
than the voltage across the current detection resistor, the output goes LOW.
6.
Surge Voltage Absorbing Circuit
When a phase driver changes from on to off, a surge voltage is induced due
reactance in the motor
coil. This voltage is absorbed by ZD5 via flywheel diode DA or DC (DB or
7. Driving/holding Control
Driving and holding of the
motor is controlled by the POT3 terminal of the
(4 B). When the output
at the terminal is HIGH, the motor is held, and when it is LOW, the motor is driven. When the motor
is held, the PF motor power switch turns off, and + 5 V is applied to
via D 16 and R99
and
: . .
2-96
Содержание LQ-2550
Страница 1: ...L Q 2 5 5 0 TECHNICAL MANUAL EPSON ...
Страница 215: ...REV A EEEl n R O M A B O A R D m CJ P R I N T E R MECHAN SM Figure 5 2 Extension Cable Connections 5 3 ...
Страница 240: ...REV A P r cl Figure 6 3 LQ 2550 Lubrication and Adhesive Application Points Diagram 2 6 3 ...
Страница 241: ...REV A 7 i_ Figure 6 4 LQ 2550 Lubrication and Adhesive Application Points Diagram 3 6 4 ...
Страница 252: ...REV A I 1 I 7 v m o m x b Figure A 6 PPD781OHG Block Diagram A 7 ...
Страница 294: ...REV A I A 3 D r a w i n g s UNIT Y4S620200000 FI 6 3A 2SV rJl 1 T T 1 T I n b 0 e l ml Component Layout A 49 ...
Страница 296: ...REV A A h 0s am 1 I I I I 1 I I 1 1 It m I I r u n 1 1 5 Q Lo O 6xm Figure A 49 ROPS Board A 5 1 Circuit Diagram ...
Страница 297: ...REV A 1 L I Irl N I i t 1 I I x Figure A 50 ROPSE Board Circuit Diagram A 52 ...
Страница 301: ...Figure A 57 Model 5560 Exploded Diagram 2 2 Figure A 58 Model 5560 Push Tractor Unit Exploded Diagram REV A A 59 ...