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Technical Information
57
Day temperature difference
In case fixe speed compressors are used parameter (
121
Compressor command type
is set to
Relays or Softstarters), the cabinet temperature is controlled by a two-level controller. This parameter
represents the hysteresis of the regulator during daytime operation. If a variable speed compressor is used
(
121 Compressor command type
is set to Drive) the temperature / capacity control is done by a PI controller
152 Capacity control Kp
and
124
Capacity control Ki
).
.
Thermostat
off
Thermostat
on
Set point
Difference
Control Temperature
Figure 19: Deadband Control
58
Night temperature difference
In case fixe speed compressors are used parameter (
121 Compressor command type
is set to Relays or
Softstarters), the cabinet temperature is controlled by a two-level controller.. This parameter represents the
hysteresis of the regulator during nighttime operation. If a variable speed compressor is used (
121
Compressor command type
is set to Drive) the temperature / capacity control is done by a PI controller
152
Capacity control Kp
and
124 Capacity control Ki
).
59
Day Night transition time
During changeover from daytime to nighttime operation the fans and the compressor are switched off for this
period. This is necessary to guarantee a failure-free shut down of the night curtain.
60
Thermostat cycle off time
In case of a temperature sensor failure the controller is entering an emergency operation mode (cycling)
without a feedback. The off time between two periods of cooling is defined by this parameter.
61
Thermostat cylce on time
In case of a temperature sensor failure the controller is entering an emergency operation mode (cycling)
without a feedback. The period time of cooling is defined by this parameter.
62
MOP control
MOP (maximum operating pressure) control mode is enabled by this parameter.
This function is only active if an electronic expansion valve is used.
63
MOP temperature
The saturation temperature in MOP mode is defined by this parameter.
This function is only active if an electronic expansion valve is used.
64
Start-up valve opening duration
For stability reason in the beginning of a cooling period the opening of EXV is done by a fixed value. The period
of this state is defined by this parameter.
This function is only active if an electronic expansion valve is used.
65
Start-up valve opening
For stability reason in the beginning of a cooling period the opening of EXV is done by a fixed value. The
amount of opening in this state is defined by this parameter.
This function is only active if an electronic expansion valve is used.
