78
Reference Manual
00809-0100-4021, Rev GC
Section 3: HART commissioning
April 2014
Reset Hot Backup: Fast Keys 2-2-4-1-4
When the Primary Variable is set to First Good Temperature, the secondary sensor will remain
on the 4-20 mA output until Hot Backup is reset, even after Sensor 1 has been replaced. Because
of this, it is recommended to reset Hot Backup immediately after Sensor 1 is replaced. If Hot
Backup is not reset and Sensor 2 fails, the transmitter will go into alarm. It will not transfer back
to Sensor 1 even if sensor one has been repaired.
When the Primary Variable is set to Average Temperature, it is also recommended to reset Hot
Backup immediately after Sensor 1 is replaced in order to clear the Hot Backup Active alarm.
However, with the PV set to Average Temperature, if Hot Backup is not reset and Sensor 2 fails,
the transmitter will simply switch to output the average of only Sensor 1.
Steps to reset Hot Backup are shown below.
1.
From the Home Screen, choose
2 Configure
.
2.
Choose
2 Manual Setup
.
3.
Choose
4 Diagnostics
.
4.
Choose
1 Hot Backup
.
Summary of Contents for Rosemount
Page 1: ...Reference Manual 00809 0100 4021 Rev GC April 2014 Rosemount 3144P Temperature Transmitter ...
Page 2: ......
Page 4: ...iv Reference Manual 00809 0100 4021 Rev GC Title Page April 2014 ...
Page 10: ...x Reference Manual 00809 0100 4021 Rev GC Table of Contents April 2014 Table of Contents ...
Page 38: ...28 Reference Manual 00809 0100 4021 Rev GC Section 2 Installation April 2014 Installation ...
Page 188: ...178 Reference Manual 00809 0100 4021 Rev GC Section 5 Maintenance April 2014 Maintenance ...
Page 250: ...Index 244 Reference Manual 00809 0100 4021 Rev GC Index April 2014 Index ...
Page 251: ......