Rotating heat exchanger – Skip speed function
In some situations, ERC may cause vibrations or harmful sounds in a certain
speed-range. One skip-speed range can be defined with start and stop limits [%,
resolution 0.1] to prevent the control signal from staying in this harmful range
longer than ramp up/down times define.
When the function control output signal increases up to start limit S1, the
corresponding analog output will be put ”on hold”. After the internal control output
signal has reached the calculated middle point of the skip speed area analog
output signal will increase up to the end limit S2 speed. Analog output signal
increase will be limited by max ramp-up limitation. Analog output signal may stay at
the higher value for a while and continue to increase after internal control signal
has reached the end limit value S2 also.
When the control signal comes down, the function works in the opposite direction.
Same function is active also when ERC is used for cooling.
The function can be deactivated by setting start and end settings as zero.
10 V
Heat demand [%]
0 V
S2
S1
RMC
heat
Available parameters
Basic settings
BACnet object
R/RW
Note
Skip-speed start
RotHxSkipSpdLo
AVAL,172
RW
Setpoint S1
Skip-speed end
RotHxSkipSpdHi
AVAL,171
RW
Setpoint S2
Application functionalities
Energy Recovery
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