Setra Systems 761 Operating Instructions Manual - page 7
Figure 5: Pin out of D-sub Connector (Code D2)
Figure 6: Electrical Connection Schematic – D-sub 15-pin Connector
5
8
PIN 1
PIN 8
PIN 9
PIN 15
Pin Location
Function
2
Signal Output
5
Power Supply Common
7
Power Supply, 13-30 VDC
12
Signal Output Common
15
Chassis Ground
1,3,4,6,8,9,10,11,13,14
Not used
Signal Output
Chassis ground
Shielded cable
1
.
0
0 0 0
0V
0V
13-30 VDC
2
5
7
12
15
15 position D-Sub
Connector on
Model 761
Power Supply
Digital volmeter/
readout
6.0 Maintenance & Troubleshooting
There are no general maintenance requirements for the Model 761 other than
periodic zero adjustment. If the unit fails to operate when received or if the unit
appears damaged, notify Setra Systems or your supplier immediately. Retain
packaging materials for inspection. Do not use if damaged. If the Model 761 is
not going to be used immediately then replace the protective flange cover and
store in suitable conditions described in Section 2.
If no obvious damage has occurred a few simple checks can be made to verify
proper installation. Table 2 shows the solution to common problems with the
installation. If none of these problems / solutions are applicable, please contact
a Setra Systems applications engineer for further assistance.
Table 2: Common Installation Problems & Solutions
Problem
Cause
Solution
No signal output
Incorrect or no supply voltage
Ensure power supply is used as speci-
fied in Section 2
Readout display short circuit or
incorrect impedance
Ensure impedance of readout unit is
>10 kΩ
Signal output reads
over-range
Incorrect wiring
Ensure wiring conforms to diagrams in
Section 4.2
Potential difference between
chassis ground of unit, power
supply & readout/display
Ensure common chassis ground be-
tween unit, power supply & display
Signal output reads
under-range
Incorrect zero adjustment
Adjust zero per section 5.1
Readout display incorrect
impedance
Ensure impedance of readout unit is
>10 kΩ
Incorrect wiring polarity to
readout display
Ensure wiring conforms to diagrams in
Section 4.2
Unstable signal
Chassis ground not connected
Ensure common chassis ground be-
tween unit, power supply and display
Unstable or unregulated
Use a regulated power supply as
specified in Section 2
Electrical noise on chassis
ground
Ensure common chassis ground be-
tween power supply & display