INSTRUCTION
i
Read this instruction before installation
and wiring of the product
CTR25
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
1
CTR25
Triac controller for proportional control
of electric heating
CTR25 is a proportional controller for electric heating with automatic
voltage adaption. CTR25 pulses the whole load On - Off. The ratio
between On-time and Off-time is varied 0 - 100% to suit the prevailing
heat demand. The current is always switched at zero phase angle to
prevent RFI.
CTR25 can control both symmetrical Y-connected 3-phase heaters
and symmetrical or asymmetrical Delta-connected heaters.
CTR25 is only intended for electric heating control. The control
principle makes it unsuitable for motor- or lighting control.
CTR25 is intended for DIN-rail mounting.
Installation
Mount CTR25 on a DIN-rail in a cabinet or other enclosure.
Mount CTR25 vertically with the text right side up.
Protection class:
IP20.
Ambien temperature:
0 - 40°C
N.B.
CTR25 emits approx. 45W of heat at full output which must be
dissipated.
Wiring
Supply voltage
Terminals L1in, L2in and L3in.
Supply voltage: 210-255 or 380-415V AC
3 phase, 50 - 60 Hz with automatic voltage adaption.
Maximum current 25A/phase.
N.B.
The supply voltage to CTR25 should be wired via an all-pole switch
with a minimum contact gap of 3mm.
N.B.
CTR25 must be earthed.
1
11
3
2 3 4 5 6 7 8 9
L1 L2 L3 L3 L2 L1
Figure 1: Wiring of supply voltage and load
Load
Terminals L1out, L2out and L3out.
Resistive 3-phase heater without neutral.
Maximum load:
3300W/phase at 230V phase - phase voltage (25A).
5750W/phase at 400V phase - phase voltage (25A).
Minimum load:
530W/phase at 230V phase - phase voltage (4A).
920W/phase at 400V phase - phase voltage (4A).
Main sensor and external setpoint (figs 2-5)
Terminals 1 and 4. Low voltage. Not polarity sensitive.
N.B.
Terminals 2 and 3 are internally connected and are used to simplify
wiring when using external setpoint.
N.B.
Choice of internal or external setpoint is made using switch 1.
11881B
OCT
15
EN
1 2
STCC-NTC15-02
3 4
1 2
3
2
STCC-NTC15-02
SAP-NTC15-01-3
3 4
Figure 2: Wiring of room sensor SA-NTC15-01 when
using internal setpoint
Figure 3: Wiring of room sensor SAP-NTC15-01-3 used as
external setpoint and sensor
Figure 4: Wiring of floor or duct sensor when using
internal setpoint
Figure 5: Wiring of external separate sensor when using SAP-
NTC15-01-3 as external setpoint
1 2
2
1
SA-NTC15-01
3 4
1 2
3
1
SAP-NTC15-01-3
3 4
