Flomec QSI Series, Installation Instructions Manual

Page: 8 / 20

8
TEMP SENSOR
PT100-Red
Sensor VCC Output
PT100-White Input High Side
PT100-Blue
Input Return
RS-485 (Galvanically Isolated)
RS485 (+)
Positive Signal
RS485 (-) Negative Signal
RS485 GND Circuit Ground*
PULSE INPUT
+5V
5 V (dc) output to
power external sensor
(+)
Digital Pulse
Frequency Input, up
to 3kHz
(-) Digital Pulse Return
4-20mA (Galvanically Isolated)
(+)
4 to 20mA current
loop - current in to
transmitter
(-)
4 to 20mA current
loop - current out of
transmitter*
Coil A
Low level sine wave
input
Coil B
Low level sine wave
input
GPI SENSOR
Ribbon cable connection to GPI
custom sensor designs
PULSE OUTPUT
(Galvanically Isolated)
(-)
Pulse Output return
current*
(+)
Pulse Output
frequency output.
This is a “current
sinking open collector”
output.***
POWER INPUT
(-)
12-30 V (ac) or
12-36 V (dc) Input A**
(+)
12-30 V (ac) or
12-36 V (dc) Input B**
PT100-Red
Coil A
GPI Sensor
Coil B
-
+
-
+
PT100-White Sensor #1
PT100-Blue
PT100-Red
PT100-White
PT100-Blue
RS-485 +
RS-485 -
RS-485 GND
+5v
+
-
+
-
Sensor #2
RS-485
Pulse Input
4-20mA
Pulse Output
Power
Figure 5
TERMINAL CONNECTIONS CHART
*NOTE: It is not recommended to
connect isolated ground connections
together or to board common.
**NOTE: Polarity of voltage for AC/
DC is not important. However an
earth ground isolated power supply is
required to prevent earth ground loop
currents and ground fault conditions.
***NOTE: This output may require an
external pull up resistor if interfacing
equipment does not include one.