Internal Rtd Connections (Relay Models Simpro-100-R-V Or N); Figure 2.15 Analog Output Wiring; Figure 2.16 Rtd Input Wiring; Table 2.1 Typical Maximum Rtd Lead Length - Siemens SIMPRO-100 Instruction Manual

2
Installation
Connect the analog output cable shield to ground
at terminal B03 (SHLD), or at the PLC or meter
location. Do not connect the shield to ground at
both locations.

Figure 2.15 Analog Output Wiring

2.4.8 Internal RTD Connections
(Relay Models
SIMPRO-100–R–V or N)
The SIMPRO-100 Relay is available with 11
optional internal RTD inputs.
When the relay is equipped with internal RTD
inputs, you can enter relay settings that define
the type, location, trip, and alarm temperatures
for each input individually. RTDs can measure the
temperature of the motor stator windings, motor
or load bearings, ambient temperature, or other
temperatures. The relay can accurately measure
temperature represented by 100-ohm platinum,
100-ohm nickel, 120-ohm nickel, or 10-ohm
copper RTDs, but does not support temperature
measurement using thermistors or
thermocouples.
The relay supports three-lead RTDs, providing
terminals for +, –, and common leads. For best
lead-resistance compensation, all three leads
should be the same length and wire gauge.
Maximum lead resistance is 25 ohms for platinum
and nickel RTDs and 3 ohms for copper RTDs.
Table 2.1 shows typical maximum RTD lead
length for various wire gauges. Use shielded
cable for the RTD connections, with the shield
connected to ground at a single point. Two shield
connection terminals, A01 and A30, are provided
for grounding at the relay.
36

Figure 2.16 RTD Input Wiring

Platinum or
RTD Lead AWG
Nickel RTD
24
(290 m)
22
(455 m)
20
(730 m)
Table 2.1 Typical Maximum RTD Lead Length
SIMPRO-100
Copper RTD
950 ft 110ft
(290 m)
1500 ft 180 ft
(54 m)
2400 ft 290 ft
(88 m)
PRIM-2400C