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This manual describes the installation of Durant models 5770X-40X through 5770X-
45X digital panel meters (DPMs). This manual steps through the installation of the
DPM in a logical order. First is a brief description of the base unit and the plug-in
option boards. Next comes mounting information, wiring diagrams (including DIP
switch settings), and programming instructions. This is followed by run mode in-
structions that the operator may need. Finally, this manual contains diagnostic test
and calibration information and specifications.
DESCRIPTION
Base Unit
The DPM converts a linear, analog voltage or current input signal into a digital read-
out for the observer. The display can be scaled to read out in units other than volts or
amps. For instance, a pressure sensor may put out a 4-20 mA signal over a range of
0-100 PSI. In this case, the DPM could be scaled to show 0 at 4 mA in, and 100 at 20
mA in. The range of the display is full four digits, with sign (-9999 to 9999). In addition
to the present reading, the unit will also display the captured maximum and mini-
mum readings. The base unit contains slots for mounting optional, plug-in circuit
boards for relay output, analog retransmission, and serial communication capabili-
ties.
Relay Output Option Board
The optional relay board contains two form C (normally open and normally closed
contacts) relays, called relay 1 and relay 2. Each relay has an adjustable high and
low setpoint. The relays act as alarms by turning on when the value on the display is
greater than the high setpoint OR is less than the low setpoint. If the low setpoint is
greater than the high setpoint, the relay turns on when the value on the display
meets both conditions; less than the low setpoint AND greater than the high setpoint.
If relay 1 is ON, the digital display will flash, visually indicating the alarm condition to
the operator.
Once a relay turns ON, it stays ON until the displayed value returns back across the
setpoint and then some. The and then some is called hysteresis. Hysteresis is a
programmable value that is common to both setpoints and both relays. This means
that a relay turns OFF when the display is less than or equal to the high setpoint
minus the hysteresis value, or when the display is greater than or equal to the low
setpoint plus the hysteresis value. Should an overlap occur between ON and OFF
conditions, the ON condition overrides the OFF condition.
INTRODUCTION/ DESCRIPTION
