Danfoss EKC 315A - Controller Startup and Tuning; Controller Start-up Procedure; Troubleshooting Fluctuations and Underswing

User Guide | Superheat controller, EKC 315A
© Danfoss | DCS (ADAP-KOOL®) | 2015-03
DKRCI.PS.RP0.D2.02 | 520H7653| 13
Start of controller
When the electric wires have been connected to the controller,
the following points have to be attended to before the regulation
starts:
1. Switch o the external ON/OFF switch that starts and stops the
regulation.
2. Follow the menu survey on page 8, and set the various para-
meters to the required values.
3. Switch on the external switch, and regulation will start.
If the superheating uctuates
When the refrigerating system has been made to work steadily,
the controller’s factory-set control parameters should in most
cases provide a stable and relatively fast regulating system.
If the system however uctuates this may be due to the fact that
too low superheat parameters have been selected:
If adaptive superheat has been selected:
Adjust: n09, n10 and n18.
If load-dened superheat has been selected:
Adjust: n09, n10 and n22.
Alternatively it may be due to the fact that the set regulation
parameters are not optimal.
If the time of oscillation is longer than the integration time:
(T
p
> T
n
, (T
n
is, say, 240 seconds))
1. Increase T
n
to 1.2 times T
p
2. Wait until the system is in balance again
3. If there is still oscillation, reduce K
p
by, say, 20%
4. Wait until the system is in balance
5. If it continues to oscillate, repeat 3 and 4
If the time of oscillation is shorter than the integration time:
(T
p
< T
n
, (T
n
is, say, 240 seconds))
1. Reduce K
p
by, say, 20% of the scale reading
2. Wait until the system is in balance
3. If it continues to oscillate, repeat 1 and 2.
4. Follow the actual room temperature or superheat on the
display.
(On terminals 2 and 5 a current signal can be transmitted
which represents the display view. Connect a data collection
unit, if applicable, so that the temperature performance can be
followed).
If the superheat has excessive underswing
during start-up
If you regulate with valve type ICM or AKV:
Adjust n22 a little bit up and/or n04 a little bit down.
If you regulate with valve type TQ:
Adjust n26 a littlle bit down