Product Overview
Table Of Contents
© Danfoss | DCS | 2019.04
Data sheet | Superheat controller type EKE 1A, EKE 1B, EKE 1C
DKRCC.PD.RS0.A4.02 | 56
Danfoss
80G8235.01
Forced opening of valve
Startup OD%
Valve OD%
Forced OD%
Auto control
Normal Reg.
Time for start
Start
Start up time
OD%
Danfoss
80G8237.01
Forced opening of valve
Startup OD%
(Minimum)
Valve OD%
Forced OD%
Reg. OD%
Auto control
Time for start
Start
Start up time
1
)
OD%
Auto adjust
valve OD%
20.0 Start up
EKE 1A 1B 1C
Applicable
Sometimes in one to one applications. the valve does not open suciently on start-up and
troublesome low pressure trips happen. The following features allows the valve to open faster as
well as to to reach the optimal operating conditions quickly.
20.1 P - Control
P-control function quickly stabilize the system's superheat by reaching optimal operating conditions
in shorter period of time. The controller is programmed for auto proportional control that will quickly
change the opening degree based on evaporating temperature and superheat of the system.
After startup, this function will provide a start opening degree during a set time period. If the limitors
such as LOP has been activated, the valve will do the auto adjustment based on the operating
conditions and the set limitations.
20.2 Start OD
with protection
Note:
At start up. if the valve is opened
too big, it could result ow of
liquid in the compressor or could
trigger the HP switch which will
stopped the system. Whereas
if you start the system with too
lowopening degree. it could also
stopped the system because of
the low pressure switch cut in.
It will be safe to start the system
with approximately 50% OD of
the valve at start up, if P-control
is not being used.
20.3 Fixed OD and time
After startup, this function will provide a constant opening degree during a set time period regardless
of the superheat value. No limiters are taken in consideration during this time.
Note:
No low superheat protection
during Fixed OD startup time
period.
Start up mode P control Start OD with protection Fixed OD without protection
Startup OD N017 N017 N017
Startup time (seconds) N015 N015 N015
Min. startup time (seconds) N104 - -
Parameter Function Value
N102 Startup mode 0 = Prop. Ctrl | 1 = Minimum OD with protection | 2 = Fixed OD without protection
Min start
time
Start time
SH
SH re
f
The Pctrl is active in
the min start time and
until SH cross the
reference
Min start
time
Start time
SH
SH ref
The Pctrl is active until
the start time if SH
does not get below
reference
Danfoss
80G361.10
Normal Reg.