Optyma Plus
TM
User
Guide RS8GD602 © Danfoss 2015-10
5
Data communication
The controller is delivered with built-in MODBUS data
communication.
If a different form of data communication is requested, a LON RS-
485 module can be inserted in the controller.
The connection will then be made on terminal RS 485.
Important
All connections to the data communication must comply with the
requirements for data communication cables.
See literature: RC8AC.
Display
The controller has one plug for a display. Here display type EKA
163B or EKA 164B (max. length 15m) can be connected.
EKA 163B is a display for readings.
EKA 164B is both for readings and operation.
The connection between display and controller must be with a
cable which has a plug at both ends.
A setting can be made to determine whether the Tc or Ts is to be
read out. When the value is read out, the second read-out can be
displayed by briefly pressing the lower button.
When a display is to be connected to the built-in MODBUS, the
display can advantageously be changed to one of the same type,
but with Index A (version with screw terminals).
The controllers address must be set higher than 0 in order for the
display to be able to communicate with the controller.
If connection of two displays is required, one must be connected
to the plug (max. 15 m) and the other must then be connected to
the fixed data communication.
Override
The controller contains a functions which can be used together
with the override function in the master gateway/system man-
ager.
Heating element in the crankcase
The controller has a thermostat function which can control the
heating element for the crankcase. Oil can thus be kept separate
from the refrigerant. The function is active when the compressor
has stopped.
The function is based on the ambient temperature and suction
gas temperature. When the two temperatures are equal ± a
temperature difference, power will be supplied to the heating
element.
The 'CCH off diff' setting indicates when power will no longer be
supplied to the heating element.
The 'CCH on diff' indicates when 100% power will be sent to the
heating element.
Between the two settings the controller calculates the wattage
and connects to the heating element in a pulse/pause cycle which
corresponds to the desired wattage.
The Taux sensor can be used to record the temperature in the
crankcase if desired.
When the Taux sensor records a temperature lower than Ts+10 K,
the heating element will be set to 100%, but only if the ambient
temperature is below 0°C.
Digital inputs
There are two digital inputs DI1 and DI2 with contact function and
one digital input DI3 with high voltage signal.
They can be used for the following functions:
DI1: Starts and stops compressor
DI2: Here the user can select from various functions
Status notification from an external safety function
External main switch
Night setback signal
Separate alarm function
Monitoring of input signal
DI3: Safety signal from low/high-pressure switch
Function via data communication
Day/Night schedule
Function in gateway/system manager
Day/Night control / Time
schedule
Used parameters in OptymaPlus
--- Night setback
Address o03 > 0
