Rice Lake Condec UMC600IS - Manual (Page 36)

Normal Weighing Mode Operations 33
5.4 Gross/Tare/Net Weighing
Operations
In normal mode, the UMC 600IS displays gross, tare,
or net weights using the LED annunciators to indicate
scale status and the type of weight value displayed.
5.4.1 Display Mode on Power Up
When the UMC 600IS is initially powered up, the
display automatically appears in the gross mode.
5.4.2 ZERO Key Function
If the gross weight zero is within the zero band, press
the zero key. There are various things that would make
invalid zero conditions. They are:
• Gross weight data above the defined zero band
• Gross weight data in motion
• Overload/underload condition
5.4.3 TARE Key Function
If the tare acquisition is greater than zero (+1/2
graduation), the display is set to the net mode and the
new tare is applied.
If the tare acquisition is negative or the scale is in
motion, the indicator stays in the current mode and no
tare is performed.
5.4.4 Overload and Underrange Conditions
Overload conditions occur when the weight exceeds
the selected scale capacity by greater than 105%.
Overload may indicate a defective load cell, load cell
simulator input, mis-wiring or no remote sense
connection. External sense leads are required.
N O T E : I f t h e i n d i c a t o r i s c o n fi g u r e d f o r
legal-for-trade (PTZ = 2%), overload occurs at 103%
of full scale capacity if push-to-zero has already
captured 2% of full scale (105% minus 2% = 103%).
Underload conditions will occur when scale input is
less than -400 grads, or underload may indicate a
defective load cell, load cell simulator input, or no
remote sense connection. Figure 5-2 shows the
indicator display associated with over and underrange
conditions.
See Section 6.1 on page 35 for information about
additional error messages.
Figure 5-2. Overload and Underrange Error Displays
5.4.5 Lb/Kg Conversion
When Parameter 10 in the configuration mode is set to
Con (conversion), pressing the
lb/kg CONV key
toggles the weight display units from lb (calibrated
base units) to kg units (converted units from base
weight data) and vice versa.
5.5 Fixed Tare Entry
Do the following to enter a fixed tare through the front
panel:
1. In normal weighing mode, press NET/GROSS
to place the unit into the net mode.
2. Using the front panel numeric keys, key in the
desired tare weight. If the displayed tare value
is correct, press the Enter (
ENT ) key. The
display changes from gross to net. Press the
Clear Entry (
CE ) key to clear an incorrect
value.
Both auto and fixed tare values can be recalled by
pressing the
TARE RECALL key. The flashing LED on
the TARE RECALL key indicates that the unit is
displaying the current tare value.
5.6 Serial Output
There are two ways in which the user can issue the
print command:
• Pressing the local PRINT key or issuing a
serial print command (unit must be set up for
bidirectional serial communication).
An intrinsic safety barrier must be
installed in the system before using
serial I/O functions.
5.6.1 Serial Data Formats
Serial data is transmitted in ASCII-compatible format
and consists of the following:
• One start bit
• Seven data bits
• One parity bit (odd)
• One stop bit
O L
Overload
U L
Underrange
Warning