Hardy Process Solutions HI 2160RC PLUS Operation And Installation Manual page 192

TROUBLE
Intermittent malfunction
of the controller, erratic
weight readouts
• Improper Cable Routing
TROUBLE
Controller locks up.
Instability in readouts
and performance of the
rate controller.
• Troubleshooting with a Simple Ground Test.
Step 1. Apply a static charge to the vessel or cabling.
Step 2. Check the weight reading. The weight reading should not
vary.
Result 1. If the reading changes radically, or the controller locks up, the
grounding is not correct.
Result 2. If the reading does not change the grounding is not the prob-
lem.
• Power Spikes
Chapter 9 - Torubleshooting and Repair
PROBABLE CAUSE
Moisture in load cell Replace the cable and
cable. load cell immediately.
Moisture sets up
stray capacitance
charges in cables
and causes ground
currents.
PROBABLE CAUSE
Low Voltage Cable, 1. Relocate the low volt-
(Load Cell Cable,
Serial Port Cable,
Analog Output
Cable, Remote Func-
tion Cable) located
too close to a high
voltage cable, strong
electro-magnetic 2. Increase the separa-
field, Silicon Control
Rectifiers (SCR),
motor control or relay
bank.
3. Relocate the cable so
4. Use a premium Load
REMEDY
REMEDY
age and/or high volt-
age cable so that there
is a minimum of 3
inches separation
between the low volt-
age cable and the high
voltage cable.
tion between the low
voltage cable and a
high electro-magnetic
field. Move the cable
until the problem goes
away.
that the cable is a mini-
mum of 14 inches from
SCRs, Motor Controls,
and Relay Banks.
Cell cable (8 conduc-
tor) with heavy shield-
ing.
9-5