FCU-MULTI Modbus Fan Coil Unit Controller

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1 Product Sheet CT2.61 Controller Type FCU-MULTI FCU-MULTI Modbus Fan Coil Unit Controller FCU-MULTI is completely stand-alone operating room controller designed for room heating, cooling, ventilation, lighting by occupancy or fan coil units. Controllers are available with 4-pipe FCU applications. Other applications are available on request. Controller configuration values are saved to eeprom during power off. Controllers can be networked to a network master using Modbus RTU. Module s address and communication speed is selected using onboard dip-switch. FEATURES 24Vac Power Supply 16 I/Os available for wide variety of applications (4-pipe FCU macro available as standard) 230Vac 6A relay outputs for fan speed or electric heater control Analogue 0..10Vdc outputs available for accurate control Heating, Cooling, Lighting and Ventilation Applications Plug-in Connectors IP55 Fire Resistant Enclosure Heating, Cooling, Lighting and Ventilation Applications Plug-in Connectors Model Types Model Description FCU-MLT-4 FCU-MULTI Universal Fan Coil Unit Controller, 4-Pipe Fan Coil Unit Application Loaded Technical Data Power Supply Vac Power Consumption Inputs: Outputs: Communication Port: Protocol: Communication Speed: Address Range: Operating Temperature IP Protection Mounting Dimensions Weight 120 ma 6 x Potential Free Contacts or Resistive Measurements 2 x 0..10Vdc Measurements (see application diagram for the IO-allocation details, other applications / allocations available on request) 4 x 230Vac Relay Outputs 4 x 0..10Vdc Outputs (see application diagram for the IO-allocation details) RS-485 Modbus RTU 9600 bps / bps, galvanic isolation / Segment 0 C.. 50 C (0%..95%rH non-condensing) IP 55, Fire Resistant Wall Mounting (DIN-rail option on request) 170W x 145H x 85D mm 0.58 kg Online Store: Enquiries: T: F: PS CT2.61 1/6

2 Typical Network Diagram FCU-MLT-4 APPLICATION DESCRIPTION This fan coil unit application is for the control of modulating control valve of heating and cooling coils, and provides three speed fan control (or 1-speed fan control). INPUT DESCRIPTION TE1 Temperature Input; NTC10kOhm SPA1 Setpoint Adjustment; 10kOhm Potentiometer (-3 C to +3 C influence to the controller setpoint) TV1 Heating Output; 0..10Vdc TV2 Cooling Output; 0..10Vdc ES1 230Vac Relay Output Fan Speed 1 ES2 230Vac Relay Output Fan Speed 2 ES3 230Vac Relay Output Fan Speed 3 DI1 Volt-Free Contact - Hardware Override to Off Mode, Normally Open DI2 Volt-Free Contact - Hardware Override to Relaxed Mode, Normally Open RI1 Resistive Measurement Manual Fan Speed Override < 500 Ohms ; Automatic Operation 500Ohm < RI1 < 1.5kOhm; Fan Speed Off 1.5kOhm < RI1 < 2.5kOhm; Fan Speed 1 2.5kOhm < RI1 < 3.5kOhm; Fan Speed 1 >3.5kOhm; Fan Speed Manual 3 No reading; Automatic Operation Enquiries: T: F: PS CT2.65 2/6

3 AUXILIARY INPUTS (MEASUREMENT ONLY, AVAILABLE OVER MODBUS) INPUT DESCRIPTION AI1 Auxiliary 0..10Vdc Measurement DI3 Volt-Free Contact 1 CONTROLLER OPERATING MODES The controller has three operating modes: day, relaxed and night (off). The diagram below illustrates these operating modes. In normal operation the controller operates in the Day mode, where the heating and cooling outputs are modulated according to the demand. The controller controls in the Day Mode to the Day SP. Comfort Tolerance (CT) is applied around the day set-point. SPA1 remote setpoint adjuster (potentiometer), if connected, will adjust the setpoint +/- 3 C. If SPA1 is not connected (no valid reading), the room influence is cancelled. In Relaxed Operation mode the controller modulates the control outputs to the SPrh and SPrc relaxed setpoints. In the Relaxed Operation SPA1 Remote Setpoint Adjuster has no influence. In the Night (Off) Mode the control outputs are normally set to 0%. Frost protection is active in the night mode. If the measured temperature TE1 drops below the frost setpoint (SPfr), the heating output is switched to 100% until the temperature has reached SPfr + 2 C. The controller can be switched to Relaxed and Night Modes via Modbus network, or via hardware volt-free contacts. Volt-free contacts have priority over the network override. Night override has higher priority than relaxed override. The table below illustrates the priority order. Priority Override Signal and Controller Mode 1 Highest DI1 Override to Off Mode 2 DI2 Override to Relaxed Mode 3 Network Variable 1 Override to Off Mode 4 Network Variable 2 Override to Relaxed Mode FAN SPEED CONTROL Fan speed is controlled automatically based on the demand. Fan speed can be manually overridden in the Day mode by varying the resistance on the RI1 input. RI1 override applies only to the Day mode. The fan speed automatic control follows the diagram below. Enquiries: T: F: PS CT2.65 3/6

4 Fan speed 1 is applied when either cooling or heating demand is more than 1%. As default fan speed 1 is switched off when the heating and cooling outputs return to 0%, and fan overrun timer of 5 minutes has been counted down. An option is provided to run Fan Speed 1 continuously in the Day Mode. Wiring Diagram (FCU-MLT-4) Notes: The output modes are configured using jumpers. Set to 0//10Vdc position for the 4-pipe FCU application. If the controller is last one in the communication network, enable the terminating resistor by setting the jumper next to the RS485 Modbus communication terminals. Enquiries: T: F: PS CT2.65 4/6

5 MODBUS CONFIGURATION PARAMETERS Register values are as follows: Description Range Access Rights Default Room temperature 0 to 50 C RO - 20 Day Set Point 15 to 30 C R/W 21 C 21 Display room adjustment -3 to +3 C RO - 22 Display operating mode (day/relaxed/night) 1/2/3 RO - 23 Override controller to Relaxed mode (1=active) Network Override to Switch the Controller to Relaxed Mode. Typically connected to WebBiter Time Program. Override controller to Night mode (1=active) Network Override to Switch the Controller to Night Mode. Typically connected to WebBiter Time Program. Display Hardware Relaxed Mode Override Input Status (1=override active closed contact) Digital Input 2 can override the controller to relaxed mode. Typically used with window contacts or with PIR movement detectors. Display Hardware Night Mode Override Input Status (1=override active closed contact) Digital Input 1 can override the controller to night mode. Typically used with window contacts or with PIR movement detectors. 0/1 R/W /1 R/W /1 RO /1 RO - 27 Display Fan Speed 0 to 3 RO - 28 Display Heating Valve Output 0 to 100% RO - 29 Display Cooling Valve Output 0 to 100% RO - 30 Display Frost Condition (1=frost condition) When the temperature drops below the frost setpoint the controller goes to the frost mode. 0/1 RO - 31 Relaxed Heating Set Point 10 to 24 C R/W 19 C 32 Relaxed Cooling Set Point 21 to 35 C R/W 23 C 33 Comfort Tolerance Area 0 to 4.0 C R/W 0.4 C 34 Proportional Band, Heating and Cooling 1 to 99 C R/W 5 C 35 Integral Action Time, Heating and Cooling 100 to 5000 R/W 600 sec s 36 sec s Frost Set-Point 0 to 15 C R/W 8 C 40 Override Fan Speed (Operates in the Relaxed or Night Modes, allows configuration for Night Cooling and Commissioning) 0/1/2/3/4 (4=relaxed mode automatic) R/W 0 41 Fan Operation in Day Mode (1=always at least speed 1, 0=off/1/2/3) Configuration parameter to allow the fan to run speed 1 when within the comfort tolerance. Often used to provide minimum air flow in normal operation conditions. 0/1 R/W 0 42 Fan switch-off delay 0 to 600 sec s R/W Auxiliary 0..10Vdc Measurement % R - 46 Auxiliary Volt-Free Contact DI3 0/1 R - 47 Manual Fan Speed Override Input Status (Read 0..5kOhms and converts the read value to 0/1/2/3/4) This parameter is used with TEHR-NTC10-P-S5 sensor to override the controller fan speed manually to operation modes 0-3 or to return back to automatic fan speed control. 0/1/2/3/4 (4=automatic operation) R - 48 Modbus RegNumb er Enquiries: T: F: PS CT2.65 5/6

6 Factory Default Reset Writing 0xD555 to this register restores Factory defaults Fan Operation in Day Mode (0=1-speed, 1=3- speed) (reset = 0xD555) R/W /1 R/W 0 50 Write current values to eeprom (write=0xd555) R/W - 63 Registers and not in use. For WebBiter the template file is available at COMMISSIONING CHECKS - Check that the controller is in day mode (Reg 23 = 1) - If not ensure that Reg 24 & 25 are 0 and Reg 26 & 27 are 0, - To test actuator outputs change the controller day setpoint (Reg 21). Now heating (Reg 29) and cooling (Reg 30) outputs will change accordingly. To get relay 2 to be ON in the Day mode and to switch OFF in the Night Mode - Change fan operation in Day Mode (Reg 42) to 1. - Change fan switch-off delay (Reg 43) to 0 seconds. - See fan speed status from Reg 28 - To override the fan (plant output relay 1) OFF, set Reg 24 to 1 and vice-versa. Enquiries: T: F: PS CT2.65 6/6

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