Reference Manual
00809-0100-4841, Rev. AA
May 2007
4-41
Rosemount 3490 Series
Relay (RL) Status
The relay status icons on the primary display have the following meanings:
= energised: Relay is presently energised.
0 = de-energised: Relay is presently de-energised.
A = Alarm: Relay allocated to alarm duty (see page 4-60 about alarms.)
S = Sampler: Relay is allocated to sampling duty.
T = Totalising: Relay is allocated to totalising duty.
Relay parameter reset
To reset all relay parameters to their factory defaults, do the following:
4. Navigate to:
MAIN MENU / SETUP / [C. UNIT /] OUTPUT / RELAY / Reset RL param
5. If you wish to proceed, press the red (ENTER) button once. (Otherwise,
use the ESC button to exit to the menu).
6. Wait until the "Please wait…" message disappears.
7. Press the ESC button to return to the menu.
NOTE:
Setting the relays to their factory default state in this way does NOT reset any
other parameters to their default state.
On/Off Point Control
Relay outputs 1 to 4 can be set-up to be On Point and Off Point control relays:
Menu: MAIN MENU / SETUP / [CONTROL UNIT /] OUTPUT / RELAY
Relay 1 (RL1):
If mode is "Set Point" (P410) - relay energised at P411 (On) and de-energised
at P412 (Off)
Relay 2 (RL2):
If mode is "Set Point" (P420) - relay energised at P421 (On) and de-energised
at P422 (Off)
Relay 3 (RL3):
If mode is "Set Point" (P430) - relay energised at P431 (On) and de-energised
at P432 (Off)
Relay 4 (RL4):
If mode is "Set Point" (P440) - relay energised at P441 (On) and de-energised
at P442 (Off)
In a basic emptying application, the On point (e.g. P411) is programmed to be
greater than the Off point (e.g. P412). Relay 1 in this case will energise when
the PV value (D800) exceeds the On point (P411) and de-energise when the
PV value drops below the Off point (P412).
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