Printer 600 Machine Controller.pdf - 第28页

0$&+,1( &21752//( 5 6(592'5,9 (&$5' 6.28 Technical Reference Manual Chapter Issue 4 May 03 Servo Drive Card Block Diagra m 44V ac is appl ied to t he servo ampli fier fr om the mains isolati ng t…

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Chapter Issue 4 May 03 Technical Reference Manual 6.27

Figure 6-20 Type 2 Servo Drive Card Layout (Part No. 153073)

LEDs

End View on

Edge Connector

Indicates pins used

This LED illuminates when the cards dc supply rail, (nominal 60Vdc) has exceeded the

threshold of 91Vdc.

Bad Power -

This LED illuminates when the temperature of the heatsink has become excessive, (over 75 C)

due to an enclosure ventilation problem or if the card has been operating at a high current

for too long.

Over Temperature -

This LED illuminates when the output current exceeds 20A on any individual cycle.

Over Current -

Power On -

This LEd illuminates to indicate that the system power (40V ac) is applied to the card.

This is the only indication during normal operation.

Disable -

This LED illuminates when the NextMove card removes the Enable signal from the I/P, ie it

echoes the state of the Enable I/P on Pin 2z.

These three LED's flashing together indicates a catastrophic over current failure.

Bad Power

Over Temperature

Over Current

Fuse F1, 250V, 20A

Disable

Over Temp

Over Curr

PWR On

Bad PWR

Edge

Connector

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6.28 Technical Reference Manual Chapter Issue 4 May 03

Servo Drive Card

Block Diagram

44Vac is applied to the servo amplifier from the mains isolating transformer.

This input is rectified on each card and is used to power the motor output stage.

The servo motors are voltage surge protected by a thermal trip device con-

nected to the system reset circuit in the power supply. The machine software

generates a profile of the correct servo demand voltage to achieve the speed

that the motor is required to rotate. Servo demand signals are applied directly

to the servo drive card from the NextMove card, the derived output is a 25kHz

PWM drive signal. An encoder that is directly attached to the motor feeds back

a series of pulses to the NextMove card to complete the servo loop. If the pulses

returned are in error, an error signal is generated

Figure 6-21 Servo Drive Schematic

NOTE

Each servo drive card has an enable input on pin 2z which must be pulled low

for the card to operate. If this input is disconnected or if there is a voltage on

the line, then the card is disabled

CAUTION

ANTI-STATIC HANDLING.

Standard precautions must be adhered to when

handling electronic cards and configuring and inserting into the enclo-

sures.

NextMove

Card

Mains

Transformer

+VE

Motor +VE

Encoder Out

Motor

Motor -VE

-VE

Demand

Output

to Motor

Error

44V ac

Enable

Servo Drive Card

+62V

25kHz PWM

-62V

+10V

-10V

Encoder

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Chapter Issue 4 May 03 Technical Reference Manual 6.29

Signals and Pins The following shows servo drive card edge connector pins for all cards used

on the machine:

NOTE

Axis 1 also has an input at pin 14d from the MultiMove card and an output at

pins 14b and 14z (0V) to provide the rising table brake function.

Pin Signal Description Edge Connector

2d Demand +V ±10V with respect to 4d from the NextMove Card.

Torque proportional to demand voltage (max

demand = 10V, Zero demand = 0V)

4d Demand - V Tied to GND

6d GND

2z Master Enable Input, must be grounded to enable card

12b Error Output Normally high, goes low in error condition

20 AC1 44V ac input from transformer tapping

22 AC2

24 Motor +ve Output to motor, ±62V Pulse Width Modulated

(PWM)

NOTE

The connectors for the output are plug-in types, the

wiring diagram does not show this connection

26 Motor -ve

28 GND 0V

Indicates connections used