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GE Power Management
469 Motor Management Relay
2-15
2 INSTALLATION
2.2 ELECTRICAL
2
2.2.11 RTD SENSOR CONNECTIONS
a) DESCRIPTION
The 469 monitors up to 12 RTD inputs for Stator, Bearing, Ambient, or Other temperature monitoring. The type
of each RTD is field programmable as 100
Ω
Platinum (DIN 43760), 100
Ω
Nickel, 120
Ω
Nickel, or 10
Ω
Cop-
per. RTDs must be three wire type. Every two RTDs shares a common return.
The 469 RTD circuitry compensates for lead resistance, provided that each of the three leads is the same
length. Lead resistance should not exceed 25
Ω
per lead for platinum/nickel type RTDs or 3
Ω
per lead for cop-
per type RTDs. Shielded cable should be used to prevent noise pickup in the industrial environment. RTD
cables should be kept close to grounded metal casings and away from areas of high electromagnetic or radio
interference. RTD leads should not be run adjacent to or in the same conduit as high current carrying wires.
Figure 2–18: RTD WIRING
IMPORTANT: The RTD circuitry is isolated as a group with the Analog Input circuitry and the
Analog Output circuitry. Only one ground reference should be used for the three circuits.
Transorbs limit this isolation to ±36 V with respect to the 469 safety ground.
MOTOR
STARTER
MOTOR
3 WIRE SHIELDED CABLE
RTD
TERMINALS
IN MOTOR
STARTER
RTD TERMINALS
AT MOTOR
Maximum total lead resistance
25 ohms (Platinum & Nickel RTDs)
3 ohms (Copper RTDs)
Route cable in separate conduit from
current carrying conductors
RTD IN
MOTOR
STATOR
OR
BEARING
806819A5.CDR
B1
A1
A2
A3
HOT
COMPENSATION
RETURN
SHIELD
CHASSIS
GROUND
R
T
D
SENSING
RT
D
#
1
469
RELAY
NOTE
Содержание MOTOR MANAGEMENT RELAY 469
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