Product Overview

© Danfoss | DCS | 2019.04
Data sheet | Superheat controller type EKE 1A, EKE 1B, EKE 1C
DKRCC.PD.RS0.A4.02 | 58
Evaporator
4-way valve
Condenser
P
TT
S2
Injection
controller
ETS
Danfoss
80G309.10
Condenser
4-way valve
Evaporator
P
TT
S2
Injection
controller
ETS
Danfoss
80G310.10
EKE superheat controller is designed to be capable of controlling superheat for a reversible system
with bi-ow injection valve (cooling / heating mode). System dynamics in these two operation modes
are normally dierent, hence the EKE controller has been designed to handle dual setting feature i.e to
set parameters individually for cooling and heating.
EKE 1A 1B 1C
Applicable
22.0 Reversible systems,
dual setting of control
parameters
Heat / Cool changeover:
The Heating / Cooling mode can be set via both a parameter and via a digital input.
If DI switch has been used, then its parameter cannot be congured to select heating / cooling mode
via bus communication.
Parameter Function Description
R102
Operation mode 0 = SH Control
N021
SH reference mode 0= Fixed SH, 1=LoadAp, 2 = Mss, 3 =Delta temp
Parameter cooling/function Parameter heating/function Description
[N009 - SH max.] [N108 - Heat SH max.] Maximum superheat reference
[N010 - SH min.] [N109 - Heat SH min.] Minimum superheat reference
[N019 - SH Kp min.]
[N111 - Heat SH Kp min.] Damping of amplication near reference value
This setting damps the normal amplication Kp, but
only just around the reference value. A setting of 0.5 will
reduce the KP value by half.
[N004 - SH Kp]
[N113 - Heat SH Kp] Superheat controller proportional gain If the Kp value is
reduced the regulation becomes slower. Increasing the
Kp value will make faster regulation. Too high value will
create superheat uctuation
[N005 - SH Tn]
[N110 - Heat SH Tn] Superheat controller integration time, If the Tn value is
increased the regulation becomes slower. Lowering the
value will create a faster superheat control. Too low value
will create superheat uctuation.
[N020 - SH Kp Te] [N114 - Heat SH Kp Te] Suction pressure (temperature) feed back gain
[N125 - Limit Tn] [N124 - Heat limit Tn] MOP/LOP/minS4 controller integration time
[N123 - Limit Kp] [N122 - Heat limit Kp] MOP/LOP/minS4 controller proportional gain
[N017 - startup OD] [N105 - Heat startup OD] OD at startup
[N107 - SH xed setpoint]
[N106 - Heat SH xed setpoint] Fixed superheat setpoint Warning! Due to the risk of
liquid ow the setting should not be lower than approx.
2-4 K. It is recommended to keep this value 2k above the
SH closed value.
[N116 - SH ref. delta temp. factor]
[N115 - Heat SH ref. delta temp.
factor]
Only relevant for SH reference mode = Delta temp
Superheat reference is set as ratio of the average
diernce from S3 to Te
SH reference calculated as (S3-Te) SH ref. delta temp
factor.
[N015 - Startup time] [N112 - Heat startup time] Maximum time where the injection can be in start mode
[N119 - SH close setpoint]
[N118 - Heat SH close setpoint] SH close setpoint for fast closing of the valve below this
value
[N104 - min. startup time] [N103 - Heat min. startup time] Maximum time where the enjection can be in start mode
Parameter Function Description
X001 MODbus Heating Heating activated via MODbus
U112 DI Heating Read the status of DI heating signal