Model 3770
DC STRAIN GAGE PANEL METER
2
C
O N N E C T I O N S
J1 – Shunt Command Connections.
Connection is used to activate the positive or negative
Shunt calibration command from the rear panel. When the + or – R CAL terminal is
connected to LOGIC COM via a switch or relay, the installed Shunt resistor will be
connected Signal and + Sense or – Sense depending on the Shunt polarity chosen
and the CAL SENSE connection. CAL SENSE line is normally connected to + Signal for
proper signal activation.
Fig. 4
SHUNT Command
Connections
J1 - SHUNT Activation
Connections
Connecting LOG COMMON to the R CAL + or
R CAL - terminal will activate the installed
shunt resistor (internal or external) across the
connected four arm bridge sensor for
simulated calibration & verification check of
the sensor’s electrical characteristics.
LOGIC COM
R CAL +
N/O
Switch
J2 - HOLD & TARE Connections.
Connection is used when external control of the "HOLD"
or "TARE" features of the unit are enabled and are controlled by an external switch, PLC or
relay. The LOGIC COM signal is used to activate the analog HOLD or Analog TARE
(offset) to the meter's display and analog output signals present on J3.
Fig. 5
J1 Logic Controls
HOLD IN
Activates Analog HOLD when connected to LOGIC COMMON
TARE IN
Activates Analog TARE when connected to LOGIC COMMON
TARE ENABLE
Enables remote TARE and disables front panel TARE when connected to LOGIC COMMON
LOGIC COMMON
Connection to enable rear panel features
Push Button, Contact Relay,
Switch…..
LOGIC COM
HOLD
TARE
TARE ENABLE
Page
9
WARNING
Qualified personnel who work on or near exposed energized electrical conductors
must follow applicable safety
related work practices and procedures including
appropriate personal protective equipment in compliance with the
Standard for
Electrical Safety Requirements for Employee Workplaces (ANSI/NFPA 70E-2012) of USA and any
additional workplace safety requirements applicable to your
installation.
