15
2.7.1 TEMPERATURE SENSOR CONNECTIONS
Use shielded, twisted, three-conductor wire for the extension of
RTD leads. The wire size should
ensure that the maximum allowable lead resistance is not exceeded. Shields on
RTD wiring
should be grounded at the controller end only, using the terminals provided.
Note: Some
RTDs may be constructed with the Sense wire color-coded as Black.
2.7.2 ALARM RELAY CONNECTIONS
The alarm output relay is a programmable dry contact output. It may be programmed for N.O.,
N.C., steady or flashing operation, and is typically used to annunciate an alarm to an external
device such as a DCS, PLC, etc.
Note: The alarm relay is intended to be used for switching low-voltage, low-current signals. Do
not use this relay to directly switch line voltages. Ensure that your application stays within the
ratings of the relay contacts as defined in Appendix A on page 61.
The alarm relay may also be used in conjunction with the +9 Vdc source to switch an external,
line-voltage relay to drive a local pilot light, etc. Refer to the wiring diagrams in Appendix C on
page 68 for example connection details.
2.7.3 EXTERNAL INPUT/OUTPUT
These input and output terminals are used to implement the Override and Ambient Temperature
Control Mode features. Refer to Section 3 on page 18 for programming details, and Appendix C
on page 68 for example wiring diagrams.
Temperature Sensors Terminal No.
Point A – Shield 25
Point A TS 1 Source (
WHT)26
Point A TS 1 Sense (
WHT) 27
Point A TS 1 Common (RED)28
Point A – Shield 9
Point A TS 2 Source (
WHT)10
Point A TS 2 Sense (WHT)11
Point A TS 2 Common (
RED)12
Point B – Shield 29
Point B TS 1 Source (
WHT)30
Point B TS 1 Sense (
WHT)31
Point B TS 1 Common (
RED)32
Point B – Shield 13
Point B TS 2 Source (
WHT)14
Point B TS 2 Sense (
WHT)15
Point B TS 2 Common (
RED)16
Alarm and Control Signals Terminal No.
Alarm relay dry contact output 17
Alarm relay dry contact output 18
Ground 19
+9 Vdc nominal Out (100 mAmps maximum) 1
Common 2
Common 3
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