Hardy HI 2151/30WC Single-Scale Controller - Manual (Page 16)

HI 2151/30WC MANUAL
1-4
NOTE: The SMM is limited to 1,000,000 lift-time write functions. A write is performed after
any parameter change to the calibration, zero, and tare functions.
NOTE: You cannot transfer the SMM from the HI 2151/30WC to the HI 2151/20WC.
Set PointRelays The HI 2151/30WC is fitted with two standard, internal, selectable and
mechanical form C (SPDT) relays. Six optional, external, solid-state
relays are available and are field configurable as form A or B types.
Both types have individual set point, preact, and deadband parameters.
Each can be programmed to respond to the standard Net or Gross
modes of operation or the optional ROC, Totalizer or Peak Hold modes.
These relays can be used to open or close valves or gates or to turn
motors, mixers, vibration equipment, heaters, coolers, etc. on or off.
Serial Port One standard serial port can be configured to receive commands and
transmit weight data to a serial device such as a printer output or bi-
directional port. By resetting jumpers within the instrument, it can be
configured for RS 232 (-A1), RS 422 (-A2) or RS 485 (-A3). Baud
rates are user selectable at 600, 1200, 2400, 4800, 9600 or 19,200.
Hardy Link LAN The Hardy Link Local Area Network (LAN) assigns an address to each
instrument and provides the firmware necessary to handle in-coming
and out-going communications.
Remote Functions Rear panel input of a level or momentary grounding that can be used to:
Tare the instrument., activate a print sequence, totalize the display,
force the Net mode, toggle between pounds or kilograms, initiate the
optional ROC (Rate-of-Change) mode, freeze the front panel display or
one of the communications ports, and clear the totalizer or peak hold
values. This is useful for adding large additional industrialized switches
to the control panel.
Auto Zero Tracking Auto Zero Tracking causes the display to indicate zero as long as any
"live weight" on the scale is below the set zero tolerance and the scale
is not in motion. This capability allows the instrument to ignore mate-
rial build-up in the weigh system within the set zero tolerance.
NOTE: Do not use auto zero tracking to correct a drifting-scale problem. Auto zero tracking will
zero and write to the SMM every second if there is a change in weight. A correct graduation
size is required to stop excessive weight changes and reduce write commands to the SMM.
See Chapter Six for graduation size setup guidelines.
NOTE: The amount of weight zeroed off is cumulative. The autozero command will fail if the
current gross weight plus any previously zeroed amount exceeds the zero tolerance.
Auto Zero Tracking is enabled when switch eight of S3 (the configura-
tion dipswitch), labeled Config on the instrument's rear panel is in the
on position.