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MIW-EVSS-DM-EN-000 - 18 / 12 / 2018
15 - 16
the analog input signal is below the value of the OFF level (if enabled) or when the
remote control input is disabled, the output voltage of the unregulated output L1 is
0 = OFF (0 VAC). Otherwise it is 1 = On (230 VAC).
Input Register 13
(30013) shows the status of the alarm LED (
Fig. 10
). It indicates
motor overheating. When the register value is ‘0’ = Off, there is no overheating and
when the value is ‘1’ = On, the overheating is detected and the controller stops the
motor.
Input Register 14
(30014) shows the operating status of the unit. When the register
value is 0 (Off), the controller is switched off. The ON/Stand-by LED on the front
panel is off. See
Fig. 10
Operating indication
.
When the value is ‘1’ (On), the controller operates according to the control algorithm,
and the analog input signal is above the selected OFF level value (if enabled). The
ON/Stand-by LED (
Fig. 10
) gives out continuous light.
The ON/Stand-by LED blinks and the register value is 2 (Stand-by) when OFF level is
enabled and the analog input signal is below the OFF level value.
HOLDING REGISTERS
(See Table 1
Modbus register maps
)
These registers are read / write registers and they can be managed with “Read
Holding Registers” command, “Write single register” and “Write Multiple Registers”
commands. They are organised in parts containing different kind of information. The
holding registers that are not used are read only. Writing values on these registers
does not return Modbus error exception; however, it does not change anything
either!
■
Part 1:
This part contains information about the unit and Modbus communication settings.
Holding register 1
(40001) contains the address at which the controller replies to
the Modbus master unit. The default address is ‘1’. You can change it in two ways:
1. Send command “Write Single Register” with address ‘1’ and write the new
address value.
2. Connect only your unit to a master controller or PC application and send the
command “Write Single Register” to address ‘0’ (Modbus broadcast address)
and write a new address value.
The next two registers (2 and 3)
contain Modbus settings. Changing these registers
you change the communication settings. The default Modbus settings are 19200-E-1
as it is stated in the Modbus Protocol Specification.
The next three registers (4, 5 and 6)
are read only. They contain information about
the hardware and firmware versions.
Holding register 7
(40007) sets the operation mode of the controller. There are two
options: Standalone mode and Modbus mode. In Standalone mode the controller is
fully controlled by the analog input signal and the selected hardware settings. In
Modbus mode the settings can be controlled by the Modbus master controller.
Holding register 8
(40008) is used for output override control. This setting is used
to override output voltage by a preselected value. This value has greater priority
over the calculated output voltage of the integrated control algorithm. Only kick
start / soft start can change the output voltage value.
Holding registers 9
(40009) and 10 (40010) are not used. They are read only.
■
Part 2:
Holding register 11
(40011) sets the analog input signal type. The default value is ‘1’
(0—10 VDC). ‘0’ is for 0—20 mA.
Holding register 12
(40012) defines the ascending / descending analog input mode.
The default value is ‘1’ is for 0—10 VDC (ascending voltage signal). The register values
are ‘0’ for 10—0 VDC and ‘1’ for 0—10 VDC when voltage signal is selected, and ‘0’
for 20— 0 mA and ‘1’ for 0—20 mA when current signal is selected.
Holding register 13
(40013) sets the maximum output voltage. The default value
is ‘100’ (100 % Us or 230 VAC). The register values vary in the range of 75—100
(75—100 % Us).
Holding register 14
(40014) sets the minimum output voltage. The default value is
‘30’ (30 % Us). The register values vary in the range of 30—70 (30—70 % Us).
EVSS
ELECTRONIC FAN SPEED
CONTROLLER WITH TK
