2020/07/23 page 10
5.
CONNECTION
TO
SUPERIOR
I&C
HVAC
SYSTEM
5.1 CONTROL
–
DESCRIPTIONS, PRIORITIES
As for the external control the communication module allows you to use:
1/
“MODBUS“ communication protocol
2/
request on capacity through the use of 0…10V signal
, operating mode via contact input
3/ request on capacity through the use of contact inputs (3 max), operating mode via contact input
The communication module respects priority of external signals as follows:
If the MODBUS communication sends at least one record from the recorded registries only commands from
MODBUS will be respected (logic and analogue signals are ignored) until the power supply is turned off.
In the analogue signal is above the power output “1” the analogue input for the power value will be accepted as
the control input.
If one of the two control inputs "MODBUS" or "analog" is not activated after switching on the power supply, the
control by logic signals (contacts) is respected.
The connection is made directly at the terminals of the communication module KM113.22.
MODBUS PROTOCOL CONTROL (MONITORING) (see separate section for description
)
5.2 INPUTS FOR EXTERNAL CONTROL
–
digital, analogue
OPERATION ACTIVATION (ON-OFF)
Input terminals “ON” –
Logic input (voltage-free contact).
When the contact "0V + D4" is closed (terminals 18+22) the operation of the device is allowed, when it is
opened the operation is stopped.
The current status of this input is indicated on the display by the size of the letter showing the selected
operational mode.
Example
:
„cO … 24 … 24“
=
operational mode “cooling “, operation is not allowed
„CO … 24 … 24“
=
operational mode “cooling“, operation is allowed
„hO … 24 … 24“
=
operational mode “heat pump”, operation is not allowed
„HO … 24 … 24“
= oper
ational mode “heat pump”, operation is allowed
OPERATIONAL MODE REQUEST “COOLING=C“, “HEAT PUMP=H“
Input terminals “MODE C/H”
- Logic input (voltage-free contact)
When the contact “0V+DI1“ is closed (terminals
18+19) the communication module sends a request to switch
the compressor unit from “cooling” mode to the “heat pump” mode = H“.
When the contact is off/open the communication module will send a request to switch the operational mode
from “heat pump” back to the “cooling mode = C“.
