GE 269Plus Instruction Manual page 194

To connect 6 stator RTDs with only 8 wires, the wiring diagram below may be used. However, this is
ommended wiring practice. All the
RETURN leads must be daisy-chained at the motor.
Providing the daisy-chain is short and RTDs are not copper (copper is very sensitive to extra resistance), the
wiring illustrated below should work properly. After the wiring, a quick test of RTD actual values is recom-
mended to ensure that all six RTDs are reading correctly.
269/269 PLUS 269/269 PLUS
RTD #1 RTD #1
RTD #2 RTD #2
RTD #3
RTD #4
RTD #5
RTD #6
To illustrate this further, let us consider RTD #1. Following the concept demonstrated earlier for finding the RTD
voltage, which will then be translated into temperature, we find that:
V V
,
1 2 Lead1HOT
V V
,
2 3 Link I
Assuming that the links at the motor side and at the relay side are the same length, gage, and material, there-
fore the same resistance, and all the hot, return and compensation leads have also the same resistance, we
can conclude that:
C-
2
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wires must travel to the 269Plus (6 wires). The compensation and
HOT
{
1
RETURN
2 2
3
{
5
I
COMPENSATION
6
7
{
9
II
10 10
11 11
{
71 71
III
70 70
69 69
{
67 67
IV
66 66
65 65
{
63 63
V
62 62
61 61
60 60
SHIELD SHIELD
V V V
RTD1 Link I Link II
V V V
Link II Link III Link IV
V V
,
1 2 2 3
269Plus Motor Management Relay
SHIELD
V V V
Link III Link IV Link V
V V V
Link V Lead6COMP Lead6RETURN
V
,
RTD 1
a rec-
MOTO OTOR
RTD #1 RTD #1
I
RTD #2 RTD #2
II RTD #3 RTD #3
III
RTD #4 RTD #4
IV
RTD #5 RTD #5
V
RTD #6 RTD #6
V
Lead6RETURN
GE Power Management