TECHNICAL REFERENCE
473
June 1999
96-8000
12.18 HYDRAULIC C OUNTERBALANCE
The spindle head weight is balanced by the upward pull of a hydraulic cylinder. The hydraulic oil forces the
piston to retract into the cylinder body. The oil is then pressurized by a nitrogen reservoir. The system is self
contained and passive (no pump is required to maintain the lift). Normal Z-Axis of the gas/oil counter balance
has the initial pressure to balance the weight at full system volume, plus an additional 50-75 psi overcharge for
longevity.
12.19 DIAGNOSTIC D ATA
The ALARM / MSGS display is the most important source of diagnostic data. At any time after the machine
completes its power-up sequence, it will either perform a requested function or stop with an alarm. Refer to
Section 210 for a complete list of alarms, their possible causes, and some corrective action.
If there is an electronics problem, the controller may not complete the power-up sequence and the CRT will
remain blank. In this case, there are two sources of diagnostic data; these are the audible beeper and the
LEDs on the processor PCB. If the audible beeper is alternating a ½ second beep, there is a problem with the
main control program stored in EPROMîš’s on the processor PCB. If any of the processor electronics cannot be
accessed correctly, the LEDîš’s on the processor PCB will or will not be lit.
If the machine powers up but has a fault in one of its power supplies, it may not be possible to flag an alarm
condition. If this happens, all motors will be kept off and the top left corner of the CRT will have the message:
POWER FAILURE ALARM
and all other functions of the control will be locked out.
When the machine is operating normally, a second push of the PARAM/DGNOS key will select the diagnostics
display page. The PAGE UP and PAGE DOWN keys are then used to select one of two different displays.
These are for diagnostic purposes only and the user will not normally need them. The diagnostic data consists
of discrete input signals, discrete output relays and several internal control signals. Each can have the value of
0 or 1. In addition, there are up to three analog data displays and an optional spindle RPM display. Their
number and functions are described in the following section.
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