Introduction
Startup Sequence
VT300 User’s Guide, Rev. A4 17 Doc # UM-VT300-EN
2 serial ports (RS232C or RS485A) for connection to printers, computers and
remote displays.
2 setpoints, 24VDC/100mA optoisolated, and 1 optoisolated input.
Four programmable print formats are available.
Weighing file stores up to 250 first-weighing or fixed-tare weights, date and time,
serial number and two reference codes.
Unit counting feature with selectable sample size.
Both printer and host PC interface can be active at the same time.
1.2.1 Options
Second scale input Scale input board
Analog output 0/4 - 20mA or 0-10V, 16 bits resolution. Powered by an external 24VDC.
RS485 serial port adapter Used for bi-directional communication with a PC
Rechargeable battery For stand-alone operation. Only available for aluminum enclosure
1.2.2 Wiring
Use load cell cable 6 x 0,5 mm
2
shielded for the sensor. Use 3 x 0,34 mm
2
shielded
for RS232C connection, and 2x0,34 mm
2
shielded twisted pair for RS485 connection.
All connections to the instrument are made through the rear panel connectors. The
shield should be connected to the metal frame of the connector.
1.2.3 Power
The instrument is powered from mains 80-250VAC, or from a rechargeable battery
(available only for aluminum enclosure option). Power supplied should come from a
source that is isolated from other process equipment.
1.3 Startup Sequence
Press the ON/OFF key ( ) to turn on the VT300. The following steps should then take
place automatically.
# Description of Step Display Shows (e.g.)
1 Software ID is displayed briefly
XXXXXX
2 Date of issue of current software version is displayed briefly.
XXXXXX
3 The scale attempts to zero automatically.
ZERO SCALE
4 If current weight is within zero range, the scale zeroes; if not , Error 15
is displayed. To continue, unload the scale and press ESC.
ZERO SCALE or
E15: PWRUP ZERO
5 Current weight is shown
000.0
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