Manual
EKC 315A Industrial Evaporator Controller
4
USCO.PD.RD0.A1.22 / 521U0092
© Danfoss USCO (HMR_MKS), 04-2008
Operating the EKC 315A
The Display
The EKC 315A has a three character digital display. Four status LEDs
(Light Emitting Diodes) are to the left of the numerals. To the right of
the display are two push buttons.
By default, the display normally shows the superheat but user
programming allows the valve’s opening degree or air temperature
to be selected as the normal display. At any given time, depressing
the lower pushbutton will change from what was selected to be
in the normal display to one of the other values depending on the
setting in parameter o17, which will be displayed for 5 seconds.
The default setting is for °C and bar to be shown in the display, but
the units can easily be changed to °F and psig. See parameter r05.
The Front Panel LEDs
The upper LED (next to the valve symbol) lights to indicate the
valve’s opening degree. A short pulse indicates a small liquid flow
and a long pulse a heavy liquid flow.
The LED next to the snowflake symbol lights to indicate that the
controller is calling for refrigeration.
The three lowermost LED’s will flash, if there is an alarm or an error in
regulation. In this situation, pushing the upper button for 1 second
will cause the alarm or error code to be displayed.
When an alarm code is displayed by pushing the upper button, the
alarm relay will be cut out.
The error (prefix E), alarm (prefix A), and status (prefix S) codes that
can appear, along with the meaning of each code, are given in the
table below.
Error, Alarm, and Status Codes
Code
Description
E1
Errors in the controller
E11
TQ valve’s actuator temperature outside its range (discontinued valve)
E15
Temperature sensor S2 (for superheat calculation) has a bad connection
E16
Temperature sensor S2 (for superheat calculation) is shortcircuited
E17
Temperature sensor S3 (air temperature sensor) has a bad connection
E18
Temperature sensor S3 (air temperature sensor) is shortcircuited
E19
The analog input signal on terminals 18 & 19 is outside the range
E20
The pressure transmitter signal on terminals 14 & 15 is outside the range
A1
High temperature alarm A1 has been detected (sensor S3)
A2
Low temperature alarm A2 has been detected (sensor S3)
A11
No refrigerant has been selected in parameter o30
S10
Regulation stopped by internal (par. r12) or external (terminals 1and 2) start/stop
S11
Thermostat relay is cut out
LED's on front panel
Opening signal to valve
Controller in refrigeration mode
Indicates an alarm, or a controller error
Indicates an alarm, or a controller error
T
