Nicotra Gebhardt DDMP 10/10, Operating Manual

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Rev. 0 - 05/11/2020
OPERATING MANUAL OPERATING MANUAL
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10.4.2 Modbus temporary ref. PID closed control loop
(INPUT TYPE = 11)
In this mode the PID reference is defined by modifying the Holding Register 66 .
The value of the reference is expressed in steps of 0.1 Volt (therefore the register ranges from 0 to 100) The PID error is calculated
in the following way:
Error = (Modbus
REG_66
- ANALOG
Input
)
10.4.3 Modbus fixed ref. PID closed control loop
(INPUT TYPE = 11)
In this mode the PID reference is defined by modifying the Holding Register 50 .
The value of the reference is expressed in steps of 0.1 Volt (therefore the register ranges from 0 to 100) The PID error is calculated
in the following way:
Error = (Modbus
REG_50
- ANALOG
Input
)
10.4.4 Modbus positive/negative feedback
Depending on the application it could be necessary to
invert the feedback behavior.
Through the Holding Register 31 it is possible to multiply
by -1 the PID error.
When the register is set to 0 -> Error = (R
eference
- M
easure
);
When the register is set to 1 -> Error = (M
easure
- R
eference
).
10.5 Changing the operation mode
Here are shown the actions passing from one operation mode to another one.
ACTION ACTIONS A ACTIONS B
Temporary Setting
-> Fixed Setting
The fan must follow the target corresponding to the value
stored the related register.
Fan is put in stop mode and after the data are saved the fan follows the
target corresponding to the value stored into the related register.
Fixed Setting ->
Temporary Setting The fan must stop waiting for a new register 66 value.
The fan must stop waiting for a new register 66 value.
Temporary Setting
-> Analog Signal
The fan must follow the target corresponding to the analog
value at the inputs.
Fan is put in stop mode and after the data are saved the fan follows the
target corresponding to the analog value.
Analog Signal ->
Temporary Setting The fan must stop waiting for a new register 66 value.
The fan must stop waiting for a new register 66 value.
Fixed Setting ->
Analog Signal
The fan must follow the target corresponding to the analog
value at the inputs.
Fan is put in stop mode and after the data are saved the fan follows the
target corresponding to the analog value.
Analog Signal ->
Fixed Setting
The fan must follow the target corresponding to the value
stored the related register.
Fan is put in stop mode and after the data are saved the fan follows the
target corresponding to the value stored into the related register.
Increasing the fan speed
The probe voltage
increases
The probe voltage
decreases
10.4.1 Analog ref. PID closed control loop (for 3-phase only)
(INPUT TYPE = 10)
In this mode the PID reference is given by the analog signal present at the ANALOG INPUT that can be monitored through the
Input
Register 29
.