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Technical Information
95
Compressor minimum off time
The compressor could only be switched on after a minimum period.
97
Alarm Mask Buzzer
98
Alarm Mask Display
99
Alarm Mask Relay
Alarms could be suppressed by these parameters.
100 Discharge temperature alarm threshold
If the discharge temperature stays above this threshold for more than 5 seconds an alarm is triggered. If the
discharge temperature falls back above this threshold within this time no alarm is triggered.
This function is only active if a discharge temperature sensor is available.
101 Control Temperature delta factor
The corrected control temperature can be influenced by this parameter. This is done to prevent over- and
undershoots in cabinet temperature.
102 Hybrid fan control mode
If an air-cooled design is used the hybrid fan could be controlled by discharge pressure or can be switched on
and off in parallel to the compressors.
103 - 105 Modbus Address of Carlo Gavazzi RSBT compressor
softstarter 1
– 3
106 - 112
Modbus Address of EBM Modbus fan 1 - 6
113
Modbus Address of Emerson ED3 Drive
115
– 120
Default speed of EBM Modbus fan 1 -6
In normal operation, the variable speed fans are running at this speed.
121 Compressor command type
The compressors can be controlled by the defined relays (parameter
125 -132
Relay
use
up
to
3
compressors are available. Or they can be switched by the softstarters (definition of Modbus address in
parameter
103
– 105
). Or a single variable speed compressor controlled by a Drive can be configured. In this
case the Modbus Address of the Drive has to be configured in Parameter
113 Modbus Address of Emerson
ED3 Drive
. The default Address of Emerson ED3 is 45.
122 Minimum speed
To protect a variable speed compressor, it is essential to stay above a certain minimum speed during normal
operation (capacity control). The minimum speed can be found on the nameplate of the compressor.
123 Maximum speed
The maximum speed of a variable speed compressor is defined by this parameter. The maximum speed can
be found on the nameplate of the compressor.
124 Capacity control Ki
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
). This parameter defines the integral part.
