GE MULTILIN 269 MOTOR MANAGEMENT RELAY Series

APPENDIX C
C-3
The value of the compensation resistor is equal to the resistance of RETURN 1 plus HOT 1.
Assuming,
R
Lead Compensation
= R
Lead Hot
V
17,18
= V
Lead Hot
+ V
Lead Hot 1
+ V
RTD
+ V
Lead Return 1
+ V
Lead Return
V
18,19
= V
Lead Comp.
+ V
R Comp.
+ V
Lead Return
Since,
V
Lead Compensation
= V
Lead Hot
⇒ V
17,18
- V
18,19
= {V
Lead Hot +
V
Lead Hot 1
+ V
RTD
+ V
Lead Return 1
+ V
Lead Return
} -
{V
Lead Comp.
+ V
R Comp.
+ V
Lead Return
}
V
17,18
- V
18,19
= {V
Lead Hot 1
+ V
RTD
+ V
Lead Return 1
} - V
R Comp.
⇒ V
17,18
- V
18,19
= V
RTD
ONLY IF
V
R Comp.
= V
Lead Hot 1
+ V
Lead Return 1
or
R
Comp
= R
Lead Hot 1
+ R
Lead Return 1
The illustration shown in figure 3 is for RTD #8, but it may be applied to any of the RTDs.