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made via connector P9. P9 is a 5-pin connector located on the left side of the
controller (viewed from the front). The “Option Module” should always be
installed or removed with power off. Note: the “Option Module” can be potentially
damaged if installed with power on. Installing the module with power on can
cause a latch-up condition which can create an excessive amount of current
draw. This condition can cause the 5 VDC logic supply to sag below 4.5 VDC
which will create abnormal controller behavior.
An intermittent connection to the “Option Module” can cause the same latch-up
condition as installing it with power on. Intermittent connections can be caused
by improper installation, bent connection pins, moisture contamination, corrosion
of electrical contacts or excessive vibration.
Procedure
This voltage measurement can be made with a Fluke 87 meter (or equivalent). A
recording meter (Fluke 87) is preferred for intermittent problems. Remove power
from machine. Remove back cover of Intellisys and locate P9 connector. Insure
static precautions are used when handling circuit board. Re-apply power to
machine. Set meter for volts DC and connect and take measurements as noted:
Connect from P9-1 to P9-5 (top and bottom pin).
Expected value = 5 VDC +/- .2 VDC.
A second 5 VDC signal from the Intellisys is supplied to provide power for the
sensors. This signal is externally supplied through P5 and P6 connectors. This
signal is provided for both pressure transducers and thermistors (temperature). If
this signal is shorted externally, abnormal controller behavior may occur. This
could cause sensor reading errors, invalid calibration, sensor faults, sensor
warnings, or general shutdown “Ready to Start”. Potential root causes include
wiring fault to ground (chassis, sensor ground, or shield wire), moisture/corrosion
contamination of connector or sensor and solenoid fault to pressure transducer
chassis.
This voltage measurement can be made with a Fluke 87 meter (or equivalent). A
recording meter (Fluke 87) is preferred for intermittent problems. Set meter for
volts DC and connect and take measurements as noted:
Connect from P5-1 to P5-2.
Expected value = 5.0 VDC +/- .2 VDC.
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