Danfoss EKE 1A User Manual page 58

Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D
1. Superheat close (it is always important to avoid liquid back to the compressor)
2. LOP (Low operating pressure)
3. HCTP (High condensing temperature protection)
4. Min. S4 (Minimum S4 temperature)
5. MOP (Maximum operating pressure)
As an example, if the pressure is low and at the same time the superheat is low. LOP control would like to open the
valve to raise the pressure. but SH close will decrease the ow to regain a safe superheat. In this case the LOP
demand is overruled by SH close. So, in the end if the con ict still is active the mechanical low-pressure switch will
need stop the compressor.
6.3.3 Manual Mode
In the manual mode, the user can select actions based on signals from digital inputs DI2/DI3. In the manual mode
we can use 4 di erent options:
1. Manual OD from preset parameter via DI
2. Manual control of Relay
3. Manual control Valve
4. Manual Homing
 NOTE:
Too often use of Manual Homing could wear out the valve. For normal operation use overdriving feature.
Manual OD When DI 2 is con gured as Preset OD, the valve OD will be positioned as de ned by valve OD parameter
[I078 - Preset OD].
Table 53: Manual OD
Digital input O022 DI2 con guration
O037 DI3 con guration (only in
EKE 1A)
Manual Preset via DI 078 Preset OD
When manual mode becomes active, the state of alarm output will remain the same and be transferred to the
parameter(s) for Manual relay DO1. When manual mode becomes inactive the actual state of Manual relay DO1 will
be the starting point for the next mode.
Table 54: Manual control of Relay:
Parameter Function
O018 Manual mode
B101 Manual mode timeout
B103 Manual relay DO1
When DI2 /DI 3 is con gured as Preset OD, the valve OD will be positioned as de ned by valve OD parameter [I078 -
Preset OD].
Table 55: Manual Control Valve:
Parameter Function
O018 Manual mode
B101 Manual mode timeout
O045 Manual OD
Used to calibrate the valve at Zero OD %. When the user set the manual homing, a full closing operation will be
performed (same as initial closing). After the operation is performed the manual homing parameter [B104 - Manual
Homing] will be set back to o and the parameter for [O045 Manual OD] will be set to 0%. When manual mode
becomes inactive the actual OD will be the starting point for automatic control
Table 56: Manual Homing:
Parameter Function
O018 Manual mode
B101 Manual mode timeout
O045 Manual OD
© Danfoss | Climate Solutions | 2024.08
2 = Preset OD
2 = Preset OD
desired Valve OD %
Description
1 = On
time in sec. When timed out the parameter [O018 - Manual Mode] will be set to of
0 = O | 1 = ON
Description
1 = On
time in sec. When timed out the parameter [O018 - Manual Mode] will be set to O
Set desired OD in Percentage %
Description
1 = On
time in sec. When timed out the parameter [O018 - Manual Mode] will be set to O
Set desired OD in Percentage %
BC398828796060en-000103 | 58