Axis 670 Manuale delle Istruzioni Pagina 20
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After 2 additional seconds (3 seconds from tum-on), the second stage of U8 resets and the
following actions occur:
1.
The error integrator is enabled via U15D.
2.
The "position in" signal is enabled.
3.
The scanner will begin to follow the input signal.
4.
The "fault out" signal de-activates and the LED tums green.
3.13.2. Error Shutdown
There are several error states that the protection circuitiy is designed to detect and guard against.
They are:
1.
Loss of position detector
signal:
If the cable is not plugged into the scanner or the servo, or if
there is a loss of position detector signal for any reason, the fault detector will see this. Va
and Vb have to be above a minimum voltage of 0.96 volts.
2.
Position Signal. VP has exceeded +/- 10 volts: There are intemal mechanical stops within
the scanner that prevent it from spinning a fiill 360°., however during a fault state, the current
must be shut off before the rotor reaches these intemal stops. The electionics are set to sense
when the scanner has exceeded the maximum legal range, +/-20° mechanical. This is
accomplished by comparing the position signal (reduced by a factor of
two)
to the +VREF
and the -VREF levels. If Vpos exceeds either one, the fault detector will sense this over-
position and trip. Thus, the position output signal must be kept within +/-10 volts or the
servo will fault. On systems whose fieldsize has been set to +/-20° mech., the system may
trip whenever the edge of the field is approached (65535 and 0). Caution! Do not let the
system stay in this condition indefinitely. The scanner might be damaged.
3.
Over-temperature: The coil temperature must be monitored at all times when the scanner is
being operated close to its performance limit. On the 670 board this is accomplished by the
"Coil Temperature Calculator" circuit. This circuit rectifies the current signal, then performs
an I^/R calculation to determine the power dissipated in the coil. Then, loiowing its thermal
time constant and thermal conductivity to the case, the temperature can be calculated. The
"90%
Max Power Warning" output signal on J4.6 will be activated when within 10% of
tripping the fault detector. The fault detector will trip and the "fault out" signal on J4.7 will
activate whenever the coil temperature reaches its maximum safe operating limit.
4.
Loss of power: To ensure protection during "brown-outs", the servo will shut the system
down if the Input Power Voltages drop below a preset minimum. During system integration,
ensure that the power supplies and the power supply connections can meet the demands of
the scanner operated at the performance levels expected for the application. If not, the input
voltage will dip, and fault circuitry will activate. This can cause a fault "cycling" to occur.
20
- MicroMax™ Series 670 1
- Single Axis Board Level 1
- Mirror Positioning System 1
- 1.0. Introduction 4
- Class 1 14
- ACJC circuit, overposition 17
- Operating Instructions 22
- 5.0. Limited Warranty 25
- 6.0. Appendices 26
- .... 35
- ....:....:....: 36
- .1...: 36
- ['"• 38
- ': d 39
- ^^^ ^I^ 40
- 1 '• 44
- \...}....:• 45
- i..:•....:• 45
- ' 46
- ' : : i : 47
- '^^r\T\ 51
- .... L .... 52
- .... J. .... 52
- SILKSCREEN D03320 59
- XJUTmi] cEnQia 60
- In Goojo 61
- A(x our 62
- 6010-1-XXX 62
- SCANNER DRIVE CABLE 62
- 68XX DRIVE CABLE 63
- 6010-8L-XXX 64
- 3/4" TYP(4)-* 66
- 6010-16-XXX 66
- 6010-17L-XXX 68
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