Belimo TRANE TAF Series, Technical Documentation Manual

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149
I20683 - Subject to change.
Wiring Guide
Understanding Wiring Diagrams
II-B. Compatibility of Different Power Supplies
Power Supply with Half-Wave Rectifier
Half-wave rectifiers offer the advantage of using the same connection
for the AC common and DC common. Therefore, the common of dif-
ferent devices using half-wave rectifiers can be interconnected and
use the same power source.
Some devices, typically DDC controllers, have full-wave rectifiers. In this case, always use a separate transformer for the controller.
Power Supply with Full-Wave Rectifier
Full-wave rectifiers provide more current capacity. Their disad-
vantage is that the AC and DC sides cannot be interconnected.
Every device which has a full-wave rectifier must be powered from
its own separate transformer, if the COM
⊥
wire is connected to
the Common of other devices.
Note: If a device with a full-wave rectifier is powered from the same transformer as a device with a half-wave rectifier, a short cir-
cuit will result if the commons (COM
⊥)
are interconnected.
These products use half-wave rectifiers. Therefore, they may be connected to the same transformer as long as all commons
(COM
⊥
) are connected to the same leg of the transformer. However, anytime actuators are connected to a controller a separate
transformer should be used for the controller power supply unless you know that the controller also uses a half-wave rectifier.
+ DC Voltage
COM
⊥
2
1
24 VAC
DIODE
CAPACITOR
DIODE
DIODE
DIODE
DIODE
CAPACITOR
+
DC Voltage
COM
⊥
24 VAC
II-A. Electrical Symbols
U.S. Electrical Symbols for Contacts International Symbols for Contacts
Traditional Electronic Symbols for Contacts Proportional Actuators- Wire Symbols and Numbers
If a feedback is available at the actuator, we recommend that this
signal be brought back to the control panel. Even if it is not
required for the control sequence, it is a useful signal to have
available for possible troubleshooting in the future.
N.O.
(NORMALLY OPEN)
N.C.
(NORMALLY CLOSED)
N.O. N.C.
SWITCHING
NORMALLY OPEN NORMALLY CLOSED SWITCHING
NORMALLY OPEN
NORMALLY CLOSED
SWITCHING
TRI-STATE
FLOATING
CENTER OFF
1
2
3
4
5
BELIMO
ACTUATOR
COMMON
24VAC POWER
0…10VDC SIGNAL
0…20V Phase-cut Signal
2…10VDC Feedback Signal
⊥
Not applicable
for NM24 SR
and NM24 SRS
1
2
3
4
NM24 SR
or
NM24 SRS
COMMON
24VAC POWER
0…10VDC SIGNAL
2…10VDC Feedback Signal
⊥
II. UNDERSTANDING WIRING DIAGRAMS