UST500 CONTROL BOARD
62 06MC0074@00B0100
14/04/2010
Setpoint regression
If ET
≥≥≥≥
MT:
If the cycle time is long enough (and greater than MT), regression of the real setpoint occurs: for each interval of Ad06 (from the start of the
cycle), the setpoint is modified by the value set in Ad03.
•
in cooling, the setpoint (real for cycle N) is increased:
after Ad06: SET(N) + Ad03
after 2*Ad06: SET(N) + 2*Ad03
and so on until the maximum value (setpoint / hysteresis)
•
in heating, the setpoint is reduced as above, down to the minimum value (setpoint / hysteresis).
Hence for long cycle times, the "adaptive" function balances out making the cycle times compatible with compressor timings.
Cooling mode
Setpoint regression
Parameter
Description
Parameter
Ad02
Accumulation offset constant
See
Modify setpoint offset calculation
formula
Ad03
Accumulator offset differential
See
Modify setpoint offset calculation
formula
See
Setpoint regression
Ad04
Block accumulation offset setpoint in cooling mode
See
Protection in cooling mode
Ad05
Block accumulation offset setpoint in heating mode
See
Protection in heating mode
Ad06
Compressor on time for accumulation offset/regression
See setpoint regression
Ad07
Reference compressor on time for accumulation offset
See minimum time MT
Protection
COOL
If the outlet temperature < Ad04 during general cycle n, the controller performs the following actions:
•
Switches off the compressor (or compressors)
•
Clears the adaptive offset AO(n) = 0; the next cycle recommences with the original setpoint and hysteresis
This adjustment can be considered a precursor of the antifreeze alarm (the cycle stops without generating an alarm) should the adaptive
function lead to a very low real setpoint.
We recommend you set Ad04 > AL12 Internal circuit antifreeze alarm regulator setpoint
HEAT
If the outlet temperature > Ad05 during general cycle n, the controller performs the following actions:
•
Switches off the compressor (or compressors)
•
Clears the adaptive offset AO(n) = 0; the next cycle recommences with the original setpoint and hysteresis
This adjustment can be considered a precursor of the high pressure alarm (the cycle stops without generating an alarm) should the adaptive
function lead to a very high real setpoint.
To set Ad05, we recommend you refer to the high pressure safety devices in use (pressure switch configuration, type of refrigerant used, and so
on).
ET
≥≥≥≥
MT example
MT
MT
OFF
ON
SET +
Hyst.
Comp.
SET
SET -
AO(n)
time
time
Ad03
