REGIN TTC25 Electric Heating Controller Instruction Manual

: May 15, 2024
: REGIN

Table of Contents

Product View
Triac controller for proportional control of electric heating
Technical data
Installation
Wiring
Settings
Control principle
External control signal
Start-up and fault finding
Troubleshooting
Low Voltage Directive (LVD) standards
EMC emissions & immunity standards
RoHS
Contact
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REGIN TTC25 Electric Heating Controller

Product View

Read this instruction before installation and wiring of the product

Consult documentation in all cases where this symbol is used, in order to find out the nature of the potential hazards and any actions to be taken

Triac controller for proportional control of electric heating

TTC25 is a proportional, 3-phase electric heating controller with automatic voltage adjustment. The controller operates through stepless, time- proportional control, where the relationship between the on-time and off-time is based on the current heat demand.
The controller is primarily intended for use together with Regin’s NTC series of sensors for either supply temperature control or room temperature control. During room temperature control, the supply air temperature can be provided with a minimum or maximum limitation.
TTC25 can control both symmetrical Y-connected 3-phase heaters and symmetrical or asymmetrical Delta-connected heaters.
The controller is only intended for control of electric heating. The control principle makes it unsuitable for control of motors or lighting.
TTC25 is intended for DIN-rail mounting.

Technical data

Supply voltage: 3-phase, 210…255 / 380…415 V AC 3-phase,
50…60 Hz with automatic voltage adaptation.
Max. current: 25 A/phase.
Max. load: 3300 W/phase at 230 V line voltage (25 A)
5750 W/phase at 400 V line voltage (25 A)
Min. load: 530 W/phase at 230 V line voltage (4 A)
920 W/phase at 400 V line voltage (4 A)
Protection class: IP20
Ambient temp.: 0…40°C, non-condensing

Installation

Mount TTC25 on a DIN-rail in a cabinet or other casing.
Mount the controller vertically with the text right side up.

NOTE: At full power, TTC25 will emit approx. 45 W of excess heat which must be properly dissipated!

Wiring

Connect the supply voltage to the terminals L1in, L2in and L3in.

Figure 1: Wiring of supply voltage and load

NOTE: The controller must be grounded and the supply voltage must be interlocked via a high temperature limit switch!

Load

Use terminals L1out, L2out and L3out.
Resistive 3-phase heater without neutral connection.

Main sensor and external setpoint (figures 2-6)

Use terminals 1 and 4 (polarity insensitive). Low voltage.

NOTE: Terminals 2 and 3 are internally connected and are used to simplify wiring when using an external setpoint potentiometer. Switch 1 is used to select internal or external setpoint.

Figure 2: Wiring of room temperature sensor TG-R5xx or TG-R6xx when using internal setpoint

Figure 3: Wiring of TG-R430 sensor as external sensor and setpoint adjustment for room control

Figure 4: Wiring of floor or duct sensor when using internal setpoint

Figure 5: Wiring of an external, separate sensor and TG-R4xx as a setpoint device only

Figure 6: Wiring of an external, separate sensor and a TBI-xx potentiometer as a setpoint device

Limitation sensor

Terminals 5 and 6. Polarity insensitive. Low voltage.
During room temperature control, the supply air temperature can be provided with a minimum or maximum limitation. The limitation sensor is placed in the supply air duct, after the heater. Switches 2 and 3 are used to set the desired function. The Min. and Max. potentiometers are used to set the desired limitation temperatures.

Figure 7: Wiring of a limitation sensor

NOTE: TG-K360 must be used.

Settings

Potentiometers

Setp. Setpoint 0…30°C.
Min Minimum supply air temperature limit for room control with minimum limitation. 0…30°C
Max Maximum supply air temperature limit for room control with maximum limitation. 20…60°C.
CT Pulse period. 6…60 seconds.

Switches

Down = Using external setpoint potentiometer
Up = Using integrated setpoint potentiometer
Down = Minimum limitation deactivated
Up = Minimum limitation active
Down = Maximum limitation deactivated
Up = Maximum limintation active

NOTE: The minimum and maximum limitation functions can be used separetely or at the same time.

Control principle

TTC25 pulses the entire load On-Off.
The controller will adjust the mean power output to the current power demand by proportionally adjusting the On-time and Offtime ratio.
The pulse period (= the total sum of the On-time and Off-time) is settable 6…60 seconds by using the potentiometer.
TTC25 uses zero phase-angle firing to eliminate radio frequency interference.
The controller automatically adapts its control mode to suit the dynamics of the controlled object.
For rapid temperature changes, such as supply air control, TTC25 will act as a PI controller with a set P-band of 20 K and a set I-time of 6 minutes.
For slow temperature changes, such as room control, The controller will act as a P controller with a set P-band of 1.5 K.

External control signal

TTC25 can also be used for control with an external 0…10 V DC control signal from another controller.
Remove the wire strap between terminals 7 and 9 and connect the control signal as shown in figure 8.

Figure 8: Wiring of external control signal

A control signal of 0 V will provide an output of 0 % and a control signal of 10 V an output of 100 %. The minimum and maximum limitation functions are not active when using this control mode.

NOTE: A 100 kΩ resistor can be connected in parallel at the A1 so that, in case the signal is broken, the signal will go to 0. If you leave the the 0–10V disconnected, the value will float and affect the output to approximately 50%.

Start-up and fault finding

Begin by ensuring that all wiring has been performed correctly.
Measure the resistance between terminals L1out – L2out, L1out – L3out and L2out -L3out:
At 230 V line voltage: 10.6 Ω <R <66.4 Ω.
At 400 V line voltage: 18.4 Ω <R <115 Ω.
Switch on the supply voltage and turn the setpoint knob to its maximum value. The LED should be either continuously on, or pulse on/off with a progressively longer ontime so that it is eventually on continuously.
Turn the setpoint knob to its minimum value. The LED should either switch entirely off or pulse with a progressively shorter ontime so that it finally switches off completely. At a middle position of the proportional band (when the setpoint = the actual value), the pulsing of the LED will perfectly coincide with the controller pulsing current to the heater. The pulse cycle time is 6…60 seconds depending on the settings of the CT potentiometer. Use a clamp-on multimeter to ensure current is passing to the heater when the LED is lit.

Troubleshooting

Disconnect all wiring to the external sensor and setpoint device (if any). Measure the resistance of the sensor and/or setpoint potentiometer separately. The resistance of the potentiometer varies 0…5 kΩ between its minimum and maximum settings. The sensor resistance varies 10 kΩ…15 kΩ between the minimum and maximum temperature range. I.e. a TG-K330 has 15 kΩ at 0°C and 10 kΩ at 30°C. The resistance changes by 167 Ω/°C.
Leave the sensor terminals disconnected. Set all switches to their downward positions. Switch the supply voltage on. the controller should provide full, unimpeded output and the LED should be lit. Use a clamp-on multimeter to ensure current is passing to the heater.
If the LED is not lit and no current is flowing: Ensure that terminals L1in, L2in and L3in all have power. If they do, the controller is probably faulty.
If the LED is lit but no current is flowing: Measure the heater resistance. If it is OK, the controller is probably faulty.
Switch off the supply voltage and short-circuit sensor inputs 1 and 4. Switch the supply voltage on again.
The controller should now not provide any output at all. The LED should be switched off. Use a clamp-on multimeter to ensure no current is passing to the heater.
If the LED is off but current is flowing to the heater, the controller is probably faulty.
If the LED is lit: Recheck the short-circuiting of the sensor inputs.
If it is OK, the controller is probably faulty.
If everything is correct up to this point, the controller and the sensor are OK.
Shut off the supply voltage, remove the wire strap from the the sensor input terminals and reconnect the sensor(s) and external setpoint potentiometer (if any). Set the switches to their correct positions and switch the supply voltage back on.

Low Voltage Directive (LVD) standards

This product conforms to the requirements of the European Low Voltage Directive (LVD) 2014/35/EU through product standards EN 60730-1 and EN 60730-2-9.