EKC 316A
Reference manual RS8ED102 © Danfoss 03-2006
3
The maximum length of cable between EKC 316A and the ETS
valve is five meters. If cable lengths are in excess of this value then
it is recommended to use an inductive filter.
AKS 33 Pressure transmitter connected to two EKC 316A
controllers
An AKS33 pressure transmitter can be connected up to two EKC
316A controllers.
In case of problems the following checks can be made:
1) Ensure that the voltage between terminals 14 and 16 is
approximately 14.5 Volts.
2) Check that the resistance between terminals 15 and 16 is 100
Ohms.
3) If there are problems in connecting the AKS 33 and EKC316A
controllers as shown above, disconnect the controller to the
right and place a 100 Ohms resistor between the wires that
were previously connected at terminals 15 and 16. Check that
the pressure reading in the controller to the right is correct. If
there are still problems and assuming that checks 1) and 2) have
been carried out, check the connections to the AKS 33.
Stepper motor Output
After installation the following checks can be made to the connec-
tion between the EKC316A controller and the stepper motor of
the ETS valve.
1) With the power off, check that resistance between terminals
21 and 22 and terminals 23 and 24 is approximately 53 Ohms.
Make slight allowances for cable resistance.
2) With the power on and parameter o18 set to 1, measure the
phase current from terminals 21 (or 22) and terminals 23 (or 24)
with a true RMS multimeter when the valve is operating. The
valve can be driven from 0% to 100% and vice versa by chang-
ing valve opening percent in parameter o45. The phase current
should be 70 mA rms when operating.
Remember to set o18 back to 0 after checks.
3) If the checks 1) and 2) are not correct, ensure that motor cable
corrections are correct and the cable length is less than five
meters (see section 1 )
Output relay contacts
The two output relays in the controller are respectively the relay
for starting refrigeration and alarm relay. Ensure the following
action:
1) The contact for refrigeration will be made when the superheat
regulation in the controller starts operating. The contact will be
broken if the regulation cannot start or is stopped.
2) The contact of the alarm relay will be made when there is an
alarm.
To ETS Valve
Filter
