CoP
Compressor settings
"
uPt
"
Min. no
Max. yes
Default no
Voltage protection
"
no
": no voltage protection.
"
yES
": voltage protection activated based on voltage related settings.
"
uLi
"
Min. 0 V AC
Max. 270 V AC
Default 0 V
Minimum cut-in voltage/uLi. Minimum cut-out voltage/uLo.
Maximum voltage/uHi
These three parameters provide voltage protection to the compressor.
Start by setting "
uHi
", followed by "
uLo
" and "
uLi
".
"
uLi
": when the compressor is due to start, the voltage of the power
supply will be checked and the compressor will only be allowed to
start if it is at least the value given in this parameter.
"
uLo
": when the compressor is running, it will be switched
OFF if the voltage goes below that given in this
parameter.
"
uHi
": when the compressor is running, it will be switched
OFF if the voltage exceeds that given in this parameter.
If the compressor is already stopped, it will remain
switched OFF.
"
uLo
"
Min. 0 V AC
Max. 270 V AC
Default 0 V
"
uHi
"
Min. 0 V AC
Max. 270 V AC
Default 270 V
"
EHd
"
Default no
Sensor Error Type
"
no
": no sensor error handling.
"
SEt
": in case of control sensor error, follow error run/stop time.
"
Ert
"
Min. 0 min
Max. 60 min
Default 0 min
Error Run Time
The parameter only become active in the unlikely event of a broken
temperature sensor. It is used to run the application in safety mode.
At the same time the sensor error will be shown in the display.
"
Ert
" define the duration the compressor will run.
Example: "
Ert=4
" [min] and "
ESt=16
" [min] will provide an average cooling
system activity of 20%. Ert and "
ESt
" values are based on OEM experience
and are by default inactive.
"
ESt
"
Min. 0 min
Max. 60 min
Default 1 min
Error Stop Time
The parameter only become active in the unlikely event of a broken
temperature sensor. It is used to run the application in safety mode.
At the same time the sensor error will be shown in the display.
"
ESt
" define the duration the compressor will be "
idle
".
"
CSt
"
Min. 0 min
Max. 30 min
Default 2 min
Minimum Stop Time
It determines the minimum number of minutes the compressor must
remain idle before a Temperature cut-in can take effect. For example,
if the temperature sensor indicates that the cut-in temperature has been
reached, but the number of minutes set in this parameter have not elapsed
since the compressor last stopped, then the compressor will stay OFF.
It will only start once the duration given by "
CSt
" has been reached
provided the temperature is still high enough. "
CSt
" thus overrides the cut-in.
"
Crt
"
Min. 0 min
Max. 30 min
Default 0 min
Minimum Run Time
It determines the minimum number of minutes the compressor must run
before a Temperature cut-out can take effect. For example, if the
temperature sensor indicated that the cut-out temperature has been
reached, but the number of minutes set in this parameter have not
elapsed since the compressor last started, then the compressor will
continue. It will only stop once the duration given by "
Crt
" has been
reached – provided the temperature is still low enough.
"
Crt
" thus overrides the cut-out.
"
Cot
"
Min. 0 min
Max. 480 min
Default 0 min
Maximum OFF Time
This is the maximum time in minutes the compressor is allowed to
"
idle
" – up to 480 minutes. Cot is set to zero by default (inactive).
If the controller is used on a draft beer (ice bank) application, this
parameter can be used to control the ice thickness.
User Guide | ERC 112 Refrigeration Controller
14 | BC200686422115en-000802
© Danfoss | DCS (vt) | 2019.07
