J - electrical inspection -19 – Hardy HI 2151/30WC Single-Scale Controller User Manual
Page 139
Chapter 8 - Troubleshooting
8-19
J - Electrical
Inspection
J
J 1
1)
Use the load cell certificates to verify color code Input is
excitation, Output is signal.
2)
Shielding
a)
Grounded only at the weigh controller
b)
Continuous shield connection from the Load cell cable
to the controller. Single point EMI/RFI drain.
c)
Terminated, but not grounded, at the summing box.
3)
Sense lines installed?
a)
Jumpers or sense lines in the J1 connector ?
b)
Sense lines must be installed for C2 of Softcal
calibration
4)
Using Integrated Technician SYSTST verify readings.
DO NOT POWER UP THE CONTROLLER UNTIL
INPUT VOLTAGES CAN BE VERIFIED.
1)
Check the specification label attached to the weight controller
chassis. (110 vac or 220 vac?)
2)
Use a meter to verify neutral, ground and Hot are proper.
3)
Computer grade power
4)
Use Active filters for motor noises and spikes.
5)
Use Isolation transformers to combat surges and sags.
6)
Isolated from SCR and motor control circuits
7)
Use a Common earth ground.
a.
Keep ground cable runs as short as possible
b.
Excessive ground cable runs can act as an antenna
for AC noise
c.
Install grounding straps around load cells to direct
static away from the load cell and directly to ground.
d.
Install ground straps on the input and discharge
piping, and the vessel to a common earth ground.
Cabling
J4
Verify the proper voltage
level has been supplied.
1)
Verify the front display illuminates.
2)
Completes the initialization process
3)
Displays a weight reading. This weight value will not be
correct if a calibration procedures was not performed.
1)
Press the MODE Button to display NET weight.
2)
Press the TARE button to ZERO the NET weight.
3)
Apply weight to the vessel
(a)
Does the weight increase and decrease in the
correct direction with the weight?
(b)
Does the weight return to ZERO NET?
(c)
The weight value will not be correct until a proper
calibration is complete.
J 3
Does the scale reflect
a weight change?
J 2
Apply power to the
controller only if supply
voltage is correct.
To Verify Proper Load Cell
Operations Go to
K