TTC80F
2
•
The controller automatically adapts its control mode to suit the
dynamics of the controlled object.
•
For rapid temperature changes, such as supply air control, TTC80F
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
TTC80F 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.
0-10V DC in
Signal neutral
8 9
7
Remove
wire
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.
Start-up and fault finding
1. Begin by ensuring that all wiring has been performed correctly.
2. Measure the resistance between terminals L1out - L2out,
L1out - L3out and L2out -L3out:
At 400 V line voltage: 5.8
Ω
<R <92
Ω
.
3. 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.
4. 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 propor
-
tional 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
1. 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.
2. 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 termi
-
nals 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.
3.
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.
4. 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.
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.
TG-K360
5 6
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
1
Down = Using external setpoint potentiometer
Up = Using integrated setpoint potentiometer
2
Down = Minimum limitation deactivated
Up = Minimum limitation active
3
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
•
TTC80F 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 Off-
time ratio.
•
The pulse period (= the total sum of the On-time and Off-time) is
settable 6...60 seconds by using the potentiometer.
•
TTC80F uses zero phase-angle firing to eliminate radio
frequency interference.