Delta MMC120 User Manual Page 68

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68
transducer count between interrogations changes too much (indicating noise), red LED 3
or 7 will be latched. Check the transducer power supply and check the wires to the
transducer.
Red LEDS 2 and 6 are on; all other red LEDS are flashing; no green LEDS
on
This indicates that the flash memory on the module has an invalid checksum. You must
download a new copy of the firmware to the module.
Duringamove,theActualPositioniserratic
Electrical noise or a defective transducer is usually the cause of this problem. Monitor
bits 1, 2, and 3 of the axis’s STATUS word to determine if the module is detecting a
transducer error. To reduce electrical noise check the following:
1. Make sure the transducer wiring is separated from all other wiring.
2. Add a termination resistor (220 ohm for Temposonics I) as close to the transducer as
possible.
3. Connect the shield at the module end, the transducer end, or both.
During a move, the drive comes to a halt for no apparent reason
When the module detects a 'transducer not responding' error it makes a Hard Stop. See
'Actual Position is erratic' above for more information. If any of the following conditions
are enabled, the axis will also halt:
Following Error
Overdrive Error
Position Overflow
Parameter Error
Integrator Windup
Transducer counts field not indicating transducer location
See“RedLEDS2,3,4,6,7,or8areon”above.
Transducer counts field changes but output drive does not work
See “During a move, the drive comes to a halt for no apparent reason” above.
The System is unresponsive and hard to tune
This problem could have several causes. The first items to check are:
1. Is there hose, rather than rigid pipe, installed between the hydraulic valve and the
cylinder? The hose expands and acts like an accumulator and the fluid goes to fill the
hose rather than move the cylinder.
2. Does the valve have overlap? Overlap in hydraulic valves causes a significant dead
band and slows the system response. Some proportional valve amplifier cards have
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