Terminals And Wiring The Units - Sinclair SCMI-01.4 User Manual

3. TERMINALS AND WIRING THE UNITS

The SCMI-01.4 control module is equipped with 20 screw terminals to connect the external
circuits. On one side of the module, there are terminals for supply voltage 230V/50Hz and
terminals for NO contacts of the output relays R1 to R3. Terminals on the other side of the
module allow you to connect a current output 4-20mA from a relative pressure sensor 0-
18bar, output 0-10V from an external performance control, two 10kΩ resistance
thermometers with coefficient ß=3435, two digital TTL inputs and two wires of a serial
communication line for controlling an outdoor unit. To connect external signals from
temperature sensors, pressure sensors, the control voltage of 0-10V, ON/OFF control and
H/C control, ordinary wires with a cross-section of 0.35-1.5mm² can be used. To connect the
outdoor units (SC1 & SC2 signals), shielded wires (cable) with a cross-section of 0.75-
1.5mm² are needed. The cable shielding may only be connected to the protective wire of the
outside unit. Connecting wires length is not critical. Regarding the thermometers, the
temperature measurement error due to wire resistance is 0.1°C if wire cross-section is
0,35mm² and length is 130m. The maximum distance between the control unit and outdoor
unit with respect to the command transmission errors is about 30m when using the
communication rate 9600bps and wire cross section 0,75mm². To connect the supply voltage
of 230V/50Hz and relay outputs, it is necessary to use wires (cables) rated for 230V/50Hz
with a cross-section of 0.5-1.5mm². For 1-phase outdoor units, the terminals SC-1 and
SC-2 of the module must be connected to the terminals 1 and 2 of the outdoor unit,
respectively. For 3-phase outdoor units, the terminals are interchanged, so to work
properly, the terminals SC-1 and SC-2 of the module must be connected to the
terminals 2 and 1 of the outdoor unit, respectively.
No. Label
1 230V-N Input 230V N
2 230V-L
Input 230V L
3 R1-0
Relay output
4 R1-1
Relay output
5 R2-0
Relay output
6 R2-1
Relay output
7 R3-0
Relay output
8 R3-1 Relay output
10 -
NC
11 VE+ Fan control
12 VE- Fan control
13 4-20mA
Current input
14 +Un
Sensor
supply
15 0-10V
Voltage input
16 GND GND
17 T1
Resistance input
18 GND
GND
19 T2
Resistance input
20 On/Off Digital input
21 GND
GND
22 H/C Digital input
23 SC-1 Communication
signal
24 SC-2 Communication
signal
Recommended accessories:
1) Carel NTC015WF00 temperature sensors (NTC type, IP67, 1.5m cable), 2pcs
2) Alco Controls PT5-18M pressure sensor + cable PT4-M15 (1.5m)
Signal type
Input of the mains supply voltage – neutral wire
Input of the mains supply voltage – phase wire
R1 relay NO contact 230V/2A
R1 relay NO contact 230V/2A
R2 relay NO contact 230V/2A
R2 relay NO contact 230V/2A
R3 relay NO contact 230V/2A
R3 relay NO contact 230V/2A
Not used
PWM signal to control the indoor fan
Common terminal for PWM signal to control the indoor fan
Current input 4-20mA for a pressure sensor
power Output +(18 to 24)V to power a pressure sensor
Voltage input 0-10V for an external control voltage
Common terminal for an external control voltage
Resistance input for T1 temperature sensor (10kΩ, ß=3435)
Common terminal for T1&T2 temperature sensors
Resistance input for T2 temperature sensor (10kΩ, ß=3435)
Digital input for On/Off signal
Common terminal for digital inputs
Digital input for Heating/Cooling signal
Output of serial communication line to control an outdoor
unit
Output of serial communication line to control an outdoor
unit
Description
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