25
I20683 - Subject to change.
TAF
General Wiring Instructions
WARNING The wiring technician must be trained and experi-
enced with electronic circuits. Disconnect power supply
before attempting any wiring connections or changes. Make
all connections in accordance with wiring diagrams and follow
all applicable local and national codes. Provide disconnect
and overload protection as required. Use copper, twisted pair,
conductors only. If using electrical conduit, the attachment to
the actuator must be made with flexible conduit.
Always read the controller manufacturer's installation
literature carefully before making any connections. Follow
all instructions in this literature. If you have any questions,
contact the controller manufacturer.
Transformer(s)
The TAF24 . . actuators require a 24 VAC class 2 transformer
and draws a maximum of 10 VA per actuator. The actuator
enclosure cannot be opened in the field, there are no parts or
components to be replaced or repaired.
– EMC directive: 89/336/EEC
– Software class A: Mode of operation type 1
– Low voltage directive: 73/23/EEC
CAUTION: It is good practice to power electronic or digital
controllers from a separate power transformer than that used
for actuators or other end devices. The power supply design
in our actuators and other end devices use half wave rectifica-
tion. Some controllers use full wave rectification. When these
two different types of power supplies are connected to the
same power transformer and the DC commons are connected
together, a short circuit is created across one of the diodes in
the full wave power supply, damaging the controller. Only use
a single power transformer to power the controller and
actuator if you know the controller power supply uses half
wave rectification.
Multiple Actuators, One Transformer
Multiple actuators may be powered from one transformer
provided the following rules are followed:
1. The TOTAL current draw of the actuators (VA rating) is
less than or equal to the rating of the transformer.
2. Polarity on the secondary of the transformer is strictly
followed. This means that all No. 1 wires from all
actuators are connected to the common leg on the
transformer and all No. 2 wires from all actuators are
connected to the hotleg.
Mixing wire No. 1 & 2 on one leg
of the transformer will result in erratic operation or failure
of the actuator and/or controls.
Multiple Actuators, Multiple Transformers
Multiple actuators positioned by the same control signal may
be powered from multiple transformers provided the following
rules are followed:
1. The transformers are properly sized.
2. All No. 1 wires from all actuators are tied together and tied
to the negative leg of the control signal. See wiring diagram.
Wire Length for TAF… Actuators
Keep power wire runs below the lengths listed in the Figure H.
If more than one actuator is powered from the same wire run,
divide the allowable wire length by the number of actuators to
determine the maximum run to any single actuator.
Example: 3 actuators, 16 Ga wire
350 ft ÷ 3 Actuators = 117 ft. maximum wire run
Maximum Wire Length:
Wire Size
Max. Feet.
Wire Size
Max. Feet
12 Ga
900 Ft.
18 Ga
225 Ft.
14 Ga
550 Ft.
20 Ga
125 Ft.
16 Ga
350 Ft.
22 Ga
60 Ft.
Figure H
Wire Type and Wire Installation Tips
For most installations, 18 or 16 Ga. cable works well with the
TAF24. . actuators. Use code-approved wire nuts, terminal
strips or solderless connectors where wires are joined. It is
good practice to run control wires unspliced from the actuator
to the controller. If splices are unavoidable, make sure the
splice can be reached for possible maintenance. Tape and/or
wire-tie the splice to reduce the possibility of the splice being
inadvertently pulled apart.
The TAF24… proportional actuators have a digital circuit that
is designed to ignore most unwanted input signals (pickup).
In some situations the pickup may be severe enough to cause
erratic running of the actuator. For example, a large inductive
load (high voltage AC wires, motors, etc.) running near the
power or control wiring may cause excessive pickup. To
solve this problem, make one or more of the following
changes:
1. Run the wire in metallic conduit.
2. Re-route the wiring away from the source of pickup.
3. Use shielded wire (Belden 8760 or equal).
Ground the
shield to an earth ground. Do not connect it to the
actuator common.
Initialization of the TAF24-SR
When power is initially applied, the actuator will first release its
manual preload position (This assumes a manual position has
been set). The actuator will then rotate to the full fail-safe
position. At this point the microprocessor recognizes that the
actuator is at full fail-safe and uses this position as the base
for all of its position calculations. The microprocessor will
retain the initialized zero during short power failures of up to
20 seconds. For power failures greater than 20 seconds, the
actuator would naturally return to its full fail-safe position prior
to the microprocessor losing its memory. The actuator will also
re-initialize if the manual position mechanism is used.
Installation Instructions
General Wiring
Summary of Contents for TRANE TAF Series
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