Emerson Rosemount 3490 Series, Reference Manual

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Table 4-17: Auto-sequence Options
Option Rotation basis
Standby Starts For Standby mode relays only - rotation is based on how many times the
'leading' relay has been energized compared to parameter P271.
Stdby On Time For Standby mode relays only - rotation is based on the hours that the 'leading'
relay has been energized compared to parameter P271.
Stdby Ratio T
(1)
For two Standby mode relays only - rotation is based on the ratio of ON time
for two relays compared to P271.
Stdby Ratio S
(1)
For two Standby mode relays only - rotation based on the ratio of starts (times
energized) compared to P271.
Assist Starts Rotation of 'leading' Assist mode relay is based on how many times it has been
energized compared to P271.
Assist On Time Rotation of 'leading' Assist mode relay is based on the hours that it has been
energized compared to P271.
Assist Ratio T
(1)
For two Assist mode relays only - rotation based on the ratio of ON time for the
two relays compared to P271.
Assist Ratio S
(1)
For two Assist mode relays only - rotation based on the ratio of starts (times
energized) compared to P271.
Off No rotation required.
(1) Ratio is based on the first two lowest-numbered relays with the same mode.
Related information
Auxiliary functions for relay modes
Energy saving
Menu SETUP
→
[CONTROLLER]
→
OUTPUT
→
RELAY
→
OVERRIDES
Table 4-18: Energy Saving Parameters
Parameter Description Factory default
P275 Engy Save Strt Set the time of day at which selected relays (P276)
will energize until each relay Off Point is reached. The
energy saving start time is valid for one minute; if
missed by the control unit being in Program mode,
no action is taken when subsequently put into Run
App mode. 0:00 h:m
P276 Engy Save RL Select relays for the operation associated with
parameter P275.
Each digit represents a relay. Relay RL1 is selected by
editing the first digit to be a “1”. Similarly, relay RL5
is selected with the fifth digit. To de-select a relay,
change the appropriate digit back to a “0”. 00000
Related information
Auxiliary functions for relay modes
Getting started Reference Manual
January 2021 00809-0100-4841
112 Emerson.com/Rosemount