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Reference Manual
IP2048/RM, Rev AA
Section 4: Starting up
February 2015
4.2.15 Setting the relay on and off points (MSP400RH)
The MSP400RH 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 energise at any value of PV, and de-
energise 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-1 on page 76 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)
1. 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).
2. Press the blue button
to enter the “r1 on” (or “r2 on“) menu and display the
present On PV value.
3. 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
).
4. Press the blue button
to start the editing. The first digit flashes to indicate it can be
edited.
5. Press the green button
repeatedly to edit the flashing digit.
6. Press the blue button
to move to the next digit. The digit flashes to indicate it can be
edited.
7. Repeat steps (5) and (6) until the last digit is flashing, and edited as required.
8. Press the blue button
to confirm the new value. (The flashing stops).
9. If the new value is correct, press the red button
to save. The display changes to the
next menu option.
10. If the new value is incorrect, press the blue button
to exit to the menu.
11. The menu “r1 on” (or “r2 on”) re-appears to re-start at step (2) or press
for the
next menu.