Setra System Model 227 - Manual (Page 2)

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3.0 ELECTRICAL INSTALLATION
3.1 Voltage Output Units
The Model 227 voltage output transducer is supplied with a 6ft. multiconductor
cable, Bayonet style connector, or D-Sub style connectors. The voltage output
is either 5 VDC FSO or 10 VDC FSO. Diagram 2 shows electrical connection
wiring for voltage output transducers, and the excitation required.
3.2 Current Output Units
The Model 227 is a two-wire loop-powered 4 to 20mA current output unit and
delivers rated current into any external load of 0-800 ohms. The Model 227 is
available with 6ft. of multiconductor cable, Bayonet style connector or D-Sub
style connectors. Diagram 3 shows electrical connection wiring for current
output transducers.
Note 1: The transducer case and integral connector Shell are electrically connected.
The power supply must be a DC voltage source with a voltage range between
10 VDC and 30 VDC measured between the + and - terminals. The unit
is calibrated at the factory with a 24 VDC loop supply voltage and a 250 ohm
load.
9 PIN 15 PIN
CABLE BAYONET D-SUB D-SUB
CONNECTION WIRE PIN PIN PIN
+ EXCITATION RED A 4 7
+ OUTPUT GREEN B 1 2
– OUTPUT WHITE C 8 12
– EXCITATION BLACK D 9 5
CASE GND DRAIN SHELL SHELL SHELL
9 PIN 15 PIN
CABLE BAYONET D-SUB D-SUB
CONNECTION WIRE PIN PIN PIN
+ EXCITATION RED A 4 7
– EXCITATION BLACK D & B 9 5
CASE GND DRAIN SHELL SHELL SHELL
Diagram 2
CONNECTOR PIN WIRING FOR VOLTAGE TRANSDUCERS
EXCITATION: 10-30 VDC FOR 0.2 TO 5.2 VDC and 0 to 5 VDC
13-30 VDC FOR 0.2 TO 10.2 VDC and 0 to 10 VDC
Diagram 3
CONNECTOR PIN WIRING FOR CURRENT TRANSMITTERS
Minimum Supply Voltage = 10 + 0.02 x Loop Resistance
Maximum Supply Voltage = 30 + 0.004 x Loop Resistance
Note 1: Model 227 can be wired as a 3-wire device by connecting – OUTPUT and
–EXCITATION and drain wire to a common ground. However, accuracy may be
reduced due to increase in resistance.
2.4 Venting
Model 227 gauge or compound transducers are vented through the
electronics housing.
and w/N1 option, see Notes 2 and 3.) (