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Reference Manual
IP2030/RM, Rev AA
Section 4: Getting started
June 2014
Section 4: Getting started
Energy saving
(Special Control Function – see Table 4-5 on page 73)
Menu: SETUP / [CONTROLLER /] OUTPUT / RELAY / OVERRIDES
P275 Engy Save Strt (Factory default is 0:00 h:m)
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
MCU900 Series control unit being in Program mode, no action is taken when
subsequently put into Run App mode.
P276 Engy Save RL (Factory default is 00000)
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”
Scum line prevention (Mobrey MCU901 and MCU902 only)
(Special Control Function – see Table 4-5 on page 73 for a full list of auxiliary relay functions)
This special control function is normally used with a pump control application to provide a small
variance in the start and stop level for the pump. It will help to prevent a build-up of scum on the
side of a wet well or sump.
Menu: SETUP / [CONTROLLER /] OUTPUT / RELAY / OVERRIDES
P277 Scum line var (Factory default is 0.0)
This parameter defines a maximum variance in the On Points and Off Points of selected
relays (P278). The variance is entered in the units of the On/Off Point, spaced in ten
equal increments within the On Point and Off Point limits. Each time the selected relays
(P278) de-energize, the variance moves on an increment
P278 Scum line RL (Factory default is 00000)
Select relays for the operation associated with parameter P277
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”
Pump-down (Mobrey MCU901 and MCU902 only)
(Special Control Function – see Table 4-5 on page 73 for a full list)
In a pump-down application, the lowest relay Off Point ('pump off' level) is normally a fixed level
above the Transmitter Bottom Reference point. However, it is sometimes required to make the
pumps continue to run for a period past the Off Point or run down the level to the Transmitter
Bottom Reference point. This can clear a sump of sludge that may have collected at the bottom.
Pump-down can be initiated automatically at pre-set intervals. A digital input can also initiate
pump-down at any time and this will re-set the interval before the next pump-down.