Nicotra DDMP Series User Manual

21
Rev. 2 – 10
th
November2015
Modbus Communication
Protocol interface: MODBUS RTU with RS485
Baud rate: 9600 baud
Parity: None
Supported Function:
- 03 – Read Output Register
- 04 – Read Input Register
- 06 – Write Single Holding Register
- 16 – Write Multiple Holding Register
Holding Register
Holding Registers
Address
Name units
Description
1 MIN SPEED rpm Defines the fan min speed.
2 MAX. SPEED rpm Defines the fan max speed.
7 MAX CURRENT mA
Defines the motor max peak current.
21 FIXED SPEED rpm
Defines a fixed speed and allows the fan running without setting the register 66 or requiring an
analog signal
34 INPUT TYPE Adim
This parameter identifies the input command for driving the fan:
Value = 0  the speed is set through Modbus by setting the register 66 (Change speed)or it is
possible to set the constant Airflow through the register 39.
(The speed reference is lost once the fan is powered off)
Value = 1  the speed is set through the analog inputs
Value = 2  the speed is set through Modbus by setting the register 21 (FIXED SPEED)
(The fan start always at the fix speed defined even if powered off)
Value = 3  the fan works in slave mode driven by analog input signal.
(see MASTER/SLAVE mode in Constant Airflow Paragraph)
Value = 4  the fan works in constant airflow mode driven by analog input signal.
(between min and max constant airflow values)
36 MAX POWER Watts
Defines the Driver max power out.
39
CONSTANT
AIRFLOW
m3/h
Defines a fixed airflow and allows the fan running without an analog input signal.
42 MIN AIRFLOW m3/h
Defines the fan min settable Constant Airflow.
43 MAX AIFLOW m3/h
Defines the fan max settable Constant Airflow.
44 FAN MODEL Adim Defines the fan sizes for the Constant Airflow application.
45 MODBUS ADDRESS Adim Configurable Modbus Address (default value = 1)
46
ALARM/TACHO
MODE
Adim
Value 0  Tachometric
Value 1  Alarm
66 SET SPEED Adim.
Defines the actual speed
Table 1 – Holding Register description
Remind! Possible modes by setting the INPUT TYPE mode at value 0 (MODBUS MODE).
- CONSTANT AIRFLOW:
insert the desired value into the holding register 39 CONSTANT AIRFLOW.
- SPEED CONTROL:
- insert the desired value into the holding register 66 SET SPEED.
Before changing the fan operating mode to ANALOG speed control, ANALOG constant
airflow, FIXED speed or MASTER&SLAVE:
- set the INPUT TYPE register to 0 (MODBUS MODE)
- set all the variables to 0
- set the analog signal in to 0V.
- set the INPUT TYPE to the desired mode.
Alternatively power the driver off and after its completely discharge, power it on.

Nicotra DDMP Series Specifications

General

Brand	Nicotra
Model	DDMP Series
Category	Fan
Language	English