Danfoss EKE 1A User Manual page 49

Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D
Parameter Function
I036 Ext ref. current low
I037 Ext ref. current high
X010 Bus ext. ref
Table 36: O setting parameters EKE 1C
Parameter Function
I021 AI4 Con guration
R106 Ext. ref o set min.
R006 Ext. ref o set max
O010 Ext ref. supply
I034 Ext ref voltage low
I035 Ext ref. voltage high
I036 Ext ref. current low
I037 Ext ref. current high
X010 Bus ext. ref
 WARNING:
• SH reference is not allowed to o set the signal below SH min.
• Only analog input AI4 can be set as an analog external reference for displacing references
• EKE1D receives reference parameter via wired CANBus, while EKE 1C, EKE 1B receive it via Modbus.
6.2.4 Compressor feed Forward function
When a compressor speed changes, system dynamics change correspondingly. Hence, Compressor speed feed
forward function changes the PI parameter values according to the actual compressor speed, which means the
reactivity of the controller is changed.
For example, when the speed of the compressor is low, this feature increases the integration time which leads to a
slower response of the PI controller.
To use this feature bus communication is needed and the master controller must send a feed-back about the
compressor speed to the EKE controller.
Table 37: Compressor feedforward function
EKE
Applicable
 WARNING:
This function is basically used in one-to-one systems and requires a Modbus (Or CANBus in EKE 1D) to feed the
compressor speed. This functionality may not be used in multi-evaporator system.
© Danfoss | Climate Solutions | 2024.08
Description
De ne min. reference current
De ne max. reference current
Readout o set in Kelvin
Description
Ext. reference
This setting determines how large the o set is when input signal is at min.
This setting determines how large the o set is when input signal is at max.
De ne how the external reference signal is used
1 = V->SH: Displacement of SH reference given by External voltage signal.
2 = V->Max OD: Maximum opening degree of the valve given by external voltage
signal
3 = V->Temp: Displacement of temperature given External voltage signal.
4 = Bus -> SH: Displacement of SH reference given via Modbus.
5 = Bus->Max OD: Maximum opening degree of the valve given via Modbus.
6 = Bus -> T: Displacement of temperature given via Modbus
7 = mA->SH: Displacement of SH reference given by External current signal.
8= Bus->Max OD: Maximum opening degree of the valve given by External cur-
rent signal.
9 = mA->Temp: Displacement of temperature given External current signal.
De ne min. reference Voltage
De ne max. reference Voltage
De ne min. reference current
De ne max. reference current
Readout o set in Kelvin
1A 1B
-
1C 1D
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