Emerson Rosemount 3100 Series - Setting the Relay on and off Points (the 3102)

Reference Manual
00809-0100-4840, Rev. BA
July 2008
Rosemount 3100 Series
4-26
Setting the Relay On and
Off Points (The 3102)
The Rosemount 3102 has two integral signal relays. Both relays are the
SPST (Single Pole, Single Throw) type.
RL1 is factory-set to be a control relay. It may be set to energize at any value
of PV, and de-energize at any other value of PV. Setting the on and off points
to a common PV will turn the relay off. The on value may be greater or smaller
than the off value, and vice-versa.
RL2 is factory-set to be a fault relay. In this mode, it de-energizes under Lost
Echo (LE) or fault conditions. The relay de-energizes if the power fails.
The mode of RL2 may be changed to control mode by entering on and off
values (use RL1 instructions below). In control mode, RL2 ceases to be a fault
relay until the On and Off values are reset to zero.
All relay set-point values must be entered in the units selected for the PV.
NOTE:
This menu option is in the programming menu. See Figure C-2 on page C-3
for a map of the menu structure and how to access the menu options.
To change the On PV point for control relay RL1 (or RL2):
a) If entering the menu system from the PV display, press the green button
↓
repeatedly until the “r1 on” (or “r2 on”) menu option is indicated
(see above note.)
b) Press the blue button
→ to enter the “r1 on” (or “r2 on“) menu and
display the present On PV value.
c) If the On PV value is correct, press the red button
↵ to exit to the menu.
(The “r1 on” or “r2 on” re-appears. To get to the next menu, press
↓.)
d) Press the blue button
→ to start the editing. The first digit flashes to
indicate it can be edited.
e) Press the green button
↓ repeatedly to edit the flashing digit.
f) Press the blue button
→ to move to the next digit. The digit flashes to
indicate it can be edited.
g) Repeat steps (e) and (f) until the last digit is flashing, and edited as
required.
h) Press the blue button
→ to confirm the new value. (The flashing stops.)
i) If the new value is correct, press the red button
↵ to save. The display
changes to the next menu option.
j) If the new value is incorrect, press the blue button
→ to exit to the menu.
The menu option “r1 on” (or “r2 on”) re-appears; re-start at step (b) or
press
↓ for the next menu option.
NOTE:
This menu option is in the programming menu. See Figure C-2 on page C-3
for a map of the menu structure and how to access the menu options.
To change the Off PV point for control relay RL1 (or RL2):
a) If entering the menu system from the PV display, press the green button
↓
repeatedly until the “r1 off” (or “r2 off”) menu option is indicated
(see above note.)
b) Press the blue button
→ to enter the “r1 off” (or “r2 off”) menu and
display the present Off PV value.