Emerson Rosemount 3490 Series Reference Manual page 114

Getting started
January 2021
Table 4-20: Pump-down Parameters
Parameter
P272
P273
P274
D845
Related information
Relay safeguard options
Auxiliary functions for relay modes
Custom mode relay
Menu
A custom mode relay is typically used together with a secondary external device to provide
a voltage-free contact connected to one of the controller digital inputs (IN1 or IN2).
For example, this function may be used to provide a low flow cut-off for a pump control if
the pump is provided with a flow/no-flow switch. A second relay contact assigned to pump
control would then be wired in series with the Custom mode relay to provide the low flow
cut-off.
114
Description
Pump down RL This is for selecting relays for a pump-down
operation.
Each of the five digits represents a relay. Relay RL1 is
selected by editing the first digit to a "1". Similarly,
relay RL5 is selected by editing the fifth digit. To de-
allocated, edit the appropriate digit back to a "0".
Pump down Int This defines a fixed interval (hours and minutes)
between pump-downs.
Pump down Dur This defines the period (hours and minutes) that the
relay will remain energized for the pump-down.
Safeguards may extend or reduce this period.
Next pump- This shows the time remaining before the next
down h:m pump-down is started. The display
shows 000:00 if a pump-down is in progress or if it is
not set-up.
SETUP → [CONTROLLER] → APPLICATION → CUSTOM
Reference Manual
00809-0100-4841
Factory default
00000
000:00 h:m
00:00
000:00
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