3–22
469 MOTOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 3: INSTALLATION
FIGURE 3–24: 2-Wire RTD Lead Compensation
The compensation lead L2 is added to compensate for Hot (L1) and Return (L3), assuming
they are all of equal length and gauge. To compensate for leads RL1 and RL2, a resistor
equal to the resistance of RL1 or RL2 could be added to the compensation lead, though in
many cases this is unnecessary.
RTD Grounding
Grounding of one lead of the RTDs is done at either the 469 or at the motor. Grounding
should
not
be done in both places as it could cause a circulating current. Only RTD Return
leads may be grounded. When grounding at the 469, only one Return lead need be
grounded as they are hard-wired together internally. No error is introduced into the RTD
reading by grounding in this manner.
If the RTD Return leads are tied together and grounded at the motor, only one RTD Return
lead can be run back to the 469. See the figure below for a wiring example. Running more
than one RTD Return lead to the 469 causes significant errors as two or more parallel
paths for the return current have been created. Use of this wiring scheme causes errors in
readings equivalent to that in the Reduced RTD Lead Number application described earlier.
FIGURE 3–25: RTD Alternate Grounding
3.2.10 Output Relays
There are six (6) Form-C output relays (see
on page 2–6 for details). Five of
the six relays are always non-failsafe; 6 SERVICE is always failsafe. As failsafe, the
6 SERVICE relay is normally energized and de-energizes when called upon to operate. It
also de-energizes when 469 control power is lost and will be in its operated state. All other
808
7
1
9
A1.CDR
469
Motor Control
Terminal Box
Motor
Hot
Compensation
RTD Return
A1
A2
A3
L1
L2
L3
Rcomp
RTD1
RL1
RL2
+
–
808
7
20A2.CDR
469
Motor Control
Terminal Box
Motor
Hot
Compensation
RTD Return
A1
A2
A3
L1
L2
L3
Compensation
Hot
Hot
Compensation
RTD Return
A4
A5
A6
A7
A8
L4
L5
L6
L7
No connection
RTD1
+
–
RTD2
+
–
RTD3
+
–
J1
J2
Содержание Masoneilan 469 Series
Страница 4: ......
Страница 91: ...CHAPTER 3 INSTALLATION 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL 3 27 3 2 14 2 Speed Motor Wiring ...
Страница 92: ...3 28 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 3 INSTALLATION ...
Страница 256: ...5 112 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 5 SETTINGS ...
Страница 298: ...6 42 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 6 ACTUAL VALUES ...
Страница 300: ...7 2 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 7 TESTING FIGURE 7 1 Secondary Injection Test Setup ...
Страница 319: ...CHAPTER 8 APPENDIX 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL 8 7 HGF5C 808841A1 HGF8 808842A1 ...
Страница 321: ...CHAPTER 8 APPENDIX 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL 8 9 808712A1 CDR ...
Страница 330: ...8 18 469 MOTOR MANAGEMENT RELAY INSTRUCTION MANUAL CHAPTER 8 APPENDIX ...