Emerson Rosemount 3490 Series Reference Manual page 112

Getting started
January 2021
Table 4-17: Auto-sequence Options
Option
Standby Starts
Stdby On Time
Stdby Ratio T
Stdby Ratio S
Assist Starts
Assist On Time
Assist Ratio T
Assist Ratio S
Off
(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
Table 4-18: Energy Saving Parameters
Parameter
P275
P276
Related information
Auxiliary functions for relay modes
112
Rotation basis
For Standby mode relays only - rotation is based on how many times the
'leading' relay has been energized compared to parameter P271.
For Standby mode relays only - rotation is based on the hours that the 'leading'
relay has been energized compared to parameter P271.
(1)
For two Standby mode relays only - rotation is based on the ratio of ON time
for two relays compared to P271.
(1)
For two Standby mode relays only - rotation based on the ratio of starts (times
energized) compared to P271.
Rotation of 'leading' Assist mode relay is based on how many times it has been
energized compared to P271.
Rotation of 'leading' Assist mode relay is based on the hours that it has been
energized compared to P271.
(1)
For two Assist mode relays only - rotation based on the ratio of ON time for the
two relays compared to P271.
(1)
For two Assist mode relays only - rotation based on the ratio of starts (times
energized) compared to P271.
No rotation required.
SETUP → [CONTROLLER] → OUTPUT → RELAY → OVERRIDES
Description
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.
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".
Reference Manual
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