AccuPro-5000
™
MEASUREMENT SYSTEM OPERATOR MANUAL
Issued by Department:
Engineering
Doc. Number:
5000-00-00-002
Revision:
02
Effective Date:
10/05/2021
File: 5000-00-00-002-r2_
AccuPro_5000_Operator_Manual
Copyright© 2021 Scaletron Industries, Ltd
All Rights Reserved
Page
61
of
63
cable, thus it’s possible that only that PCB is lacking power.
If no LEDs are lit on the LCD Board but are
lit elsewhere, then the problem may be with the ribbon cable. If no LEDs are lit on any PCB, then further
inspection is needed.
The system power supply and other sources of power from the AccuPro-5000
™, such as load
-cell
excitation voltages and the 4-20 mA current loops, are protected with independent current-limiting
features. The best approach to isolating a power problem would be to remove main power to the system,
then unplugging all of the PCBs except for the Main Processor Board. Restore main power and then re-
evaluate. If any LED activity is observed, remove main power once again and repeat the test after
inserting another PCB, one at a time, beginning with the AIBs, then AOBs, then finally the ROBs. If the
insertion of any PCB causes loss of normal LED activity, then closely examine that PCB for faulty
external wiring. Consult the factory if the problem persists.
10.2
The Measurement Value is Blinking
Whenever the measurement value (Tare + Net) exceeds the predefined capacity limit as configured by
the factory, the measurement value will blink. Though the system will continue to resolve and display
a measurement value under these conditions, the accuracy of the measurement must be questioned.
The immediate solution is to reduce the load on the Scale-Base until the blinking stops. Call the factory
for options of a long-term solution.
10.3
The 4-to-20 mA Reading is Incorrect
Confirm that the current output is properly configured within the
attention to the selection of units and setpoint options. Next, with power OFF, open the Control-Panel
by following the procedure as outlined in section titled
. The 4-to-20 mA
circuit must be powered with a voltage supply. Confirm proper position of the slider-switch on the
circuit board that selects the power source as being internally-supplied (the text
“
SCALE
”
is visible below
the slider) or externally-supplied (the text
“
LOOP
”
is visible below the slider).
If an external supply is being used
, measure the voltage at the connector and confirm it’s within
the
expected range. Note that the voltage level must be high enough to source 20 mA across the total loop
resistance. Check that the wires to the loop connector are in the proper contact position. The positions
are clearly marked on the PCB as current source (
+
) and current return (
-
). Confirm that sufficient
insulation was removed from the loop wires to prevent the spring-loaded connector contacts from
pinching the insulation rather than the wire itself. The wires should stay in the connector even when
gently
tugged. If the problem persists, take note of the loop current behavior under a changing scale
load and call the factory for assistance.
DO NOT CONFIGURE POWER SLIDER-SWITCH FOR
INTERNAL “SCALE” SUPPLY IF AN EXTERNAL “LOOP”
SUPPLY IS ALSO PRESENT. PERMANENT DAMAGE TO
THIS CIRCUIT AND/OR EXTERNAL CIRCUITRY MAY
OCCUR !
WARNING: