Rice Lake SCT-10 - Manual (Page 8)

4 SCT Weight Transmitter Operator’s Manual
1.2.2 Load Cell Testing
Load Cell Resistance Measurement (Use A Digital Multimeter):
• Disconnect the load cells from the instrument and check that there is no
moisture in the load cell junction box caused by condensation or water
infiltration. If so, drain the system or replace it if necessary.
• The value between the positive signal wire and the negative signal wire must
be equal or similar to the one indicated in the load cell data sheet (output
resistance).
• The value between the positive excitation wire and the negative excitation
wire must be equal or similar to the one indicated in the load cell data sheet
(input resistance).
• The insulation value between the shield and any other load cell wire and
between any other load cell wire and the body of the load cell must be higher
than 20 Mohm (mega ohms).
Load Cell Voltage Measurement (Use A Digital Multimeter):
• Remove weight of scale from load cell to be tested.
• Make sure that the excitation wires of the load cell connected to the
instrument is 5 Vdc +/- 3%.
• Measure the millivolt signal between the positive and the negative signal
wires by directly connecting them to the multi-meter, and make sure it reads
between 0 and 0.5 mV (thousandths of a Volt).
• Apply load to the load cell and make sure that there is a signal increment.
If one of the above conditions is not met, please contact the
technical assistance service.
1.3 Specifications
• Weight indicator and transmitter for Omega/DIN rail mounting suitable for
back panel; space saving vertical shape. Six-digit semi alphanumeric display
(18mm h), 7 segment. Four-key keyboard. Dimensions: 25x115x120 mm.
• Displays the gross weight; with an external contact capable of remote
zeroing and gross/net switching.
• IP67 box version (dimensions: 170x140x95mm). Four fixing holes diameter
4mm (center distance 122x152mm).
• Peak weight function.
Important
ANALOG OUTPUT
(Current and Voltage)
PLC
PLC or FIELD SIGNALS
2 DIGITAL INPUTS
(Optoisolated,
Externally supplied)
2 RELAY
OUTPUTS
MAX 8 LOAD CELLS IN
PARALLEL
RS-485
RS-232
Modbus RTU
SERIAL PORT
DC power
supplier
(12-24 Volt )