Installation Sheets Manual
Relays and Contactors Section
Technical Bulletin
Issue Date
121
R
R81QAA
89
R81QAA Type
Plug-In Electronic Circuit Board Kit
For M100 Series Motor Actuators
Application
The R81QAA plug-in electronic
board kit can be used in the
M100X base model motor
actuator, and as a replacement
or conversion kit in existing M100
Series motor actuators. The kit
permits the use of A91 and T91
thermistor sensors with the M100
Series motor actuators in
heating, ventilating, air
conditioning, and industrial
applications.
The R81QAA has an adjustable
set point range of 40 to 90°F
(5 to 30°C), with an adjustable
proportional band of 2 to 30F°
(1.1 to 16.7C°) minimum.
The kit consists of mounting
screws, an identification label, a
vertical plug-in board, and a
terminal board with: travel
adjustment potentiometer, set
point adjustment, proportional
band adjustment, labeled wiring
terminals.
A jumper is factory installed
between terminals X and XD for
direct output. For reverse output,
remove the jumper from the XD
terminal and connect the jumper
to the XR terminal.
When the R81QAA is installed in
an M100 Series motor actuator,
the voltage between terminal T
and terminal X (jumpered from
XD or XR) is approximately
6 VDC at zero rotation of the
output shaft. Full rotation of the
output shaft occurs when the
voltage between T1 and X is
approximately 10 VDC.
With the R81 electronics
installed, M100 Series motor
actuators will position dampers,
valves, and related equipment in
heating, ventilating, air
conditioning, and industrial
applications.
All Series R81 electronic board
kits are designed for use only as
© 1989 Johnson Controls, Inc.
Part No. 34-491-6, Rev. -Code No. LIT-121583
operating controls. Where an
operating control failure would
result in personal injury and/or
loss of property, it is the
responsibility of the installer to
add devices (safety, limit
controls) that protect against, or
systems (alarm, supervisory
systems) that warn of control
failure.
Installation
To install the R81 board kit in an
M100X Series base motor
actuator, proceed as follows:
1.
Remove the motor
actuator’s top cover by
loosening the two cover
screws.
1
2.
Install terminal board “E” by
carefully placing the
terminal receptacles onto
the pin terminals. (See
Fig. 1, 1-A.)
3.
Fasten the board in place
using the screws “D” that are
supplied with the R81 kit.
4.
Install vertical board “C” by
carefully placing the
terminal receptacles onto
the pin terminals. (See
Fig. 1, 1-B.)
5.
6.
Place bracket “B” supplied
with the motor actuator,
over vertical board “C”, and
fasten the bracket in place
with captive screw “A.”
(See Fig. 1, 1-C.)
Important: The adhesive
backed label supplied in the
R81 kit must be placed on the
label located on the insulation
barrier as shown in Fig. 2.
The letter on the R81 label
will complete the number that
identifies the M100 Series
with the R81 boards that are
installed.
7.
Install the motor actuator.
8.
Make wiring connections,
turn on power supply, adjust
and check operation.
9.
Replace the motor
actuator’s cover.
Circuit Board
Replacement
To remove and replace the
electronic circuit boards in an
existing M100Q Series motor
actuator, proceed as follows:
! CAUTION: Disconnect the
electrical power supply
before attempting to
remove the wiring
connections and the boards
to prevent possible
electrical shock or damage
to the equipment.
1.
Remove the motor actuator’s
top cover by loosening the
two cover screws.
2.
If the existing motor actuator
is installed and wired, be sure
the power supply is turned off
and then disconnect all wiring
connections to the terminal
board.
3.
Loosening screw “A” and
remove bracket “B”. (See Fig.
1.)
4.
Pull vertical board “C” straight
up. Be careful not to bend or
damage the pin terminals.
5.
Remove the two screws, “D”
from terminal board “E”.
Remove the terminal board by
lifting straight up. Be careful
not to bend or damage the pin
terminals.
6.
Install the replacement
terminal board “E” by carefully
placing the terminal
receptacles onto the pin
terminals. (See Fig. 1, 1-A.)
7.
Fasten the board in place
using the screws “D”.
8.
Install vertical board “C” by
carefully placing the terminal
receptacles onto the pin
terminals. (See Fig. 1, 1-B.)
9.
Place bracket “B”, supplied
with the motor actuator, over
vertical board “C” and fasten
the bracket in place with
captive screw “A. (See
Fig. 1, 1-C.)
10. Important: The adhesive
backed label supplied in the
R81 kit must be placed on the
label located on the insulation
barrier as shown in Fig. 2.
The letter on the R81 label
will complete the number that
identifies the M100 Series
with the R81 boards that are
installed.
11. Make wiring connections.
Turn on power supply.
Adjust, and check operation.
12. Replace the motor
actuator’s cover.
Wiring
Make wiring connections using
copper conductors only and in
accordance with the National
Electrical Code and local
regulations. Refer to the typical
wiring diagram for selected
hookup.
All splices are to be made in
junction boxes using approved
solderless connectors, or by
soldering and then taping the
connections. All splicing and
excess wiring must be located
outside of the motor actuator
wiring compartment. If desired,
a standard electrical box can be
2 R81QAA Technical Bulletin
added to the wiring compartment
of the motor actuator. (See Fig.
3.)
Polarity must be maintained
when more than one M100
Series motor actuator with the
R81QAA installed is powered
from the same 24 VAC power
source. Connect all T2
terminals to the same side of the
24 VAC supply.
To avoid potential miswiring,
separate transformers are
always recommended.
When slaving motor actuators
with the number 10 terminals
connected together, separate
transformers must be used.
(See Fig. 5.) Never connect the
T1 terminals together when the
number 10 terminals have been
connected together.
If an existing 24 VAC power
supply is used, a Johnson
controls Y68 or Y69 24:24
isolation transformer or
equivalent is necessary. The
R81Q circuitry allows an
alternate method of slaving
actuators from the “X” terminal
when precision slaving is not
required. (See Figs. 6 and 7.)
Adjustment
Set Point
The set point for the remote
sensor is located on the R81’s
terminal board and has a
calibrated dial that is adjustable
between 40 and 90°F (5 and
30°C). Should a remote set
point be desired, turn the R81’s
set point knob counterclockwise
to its limit at the low temperature
end of the dial and set the
temperature at the T91
thermostat or remote Y45BA-1
set point adjuster.
Proportional Band
The proportional band
adjustment, located on the
terminal board, is adjustable
between 2 and 30F° (1.1 to
16.7C°). Field adjustments are
made with the system in
operation. Turn the proportional
band adjustment until the
system stabilizes and the motor
actuator no longer oscillates.
! CAUTION: While narrowing
the proportional band is
usually desirable, too
narrow of a proportional
band may result in poor
control. This proportional
band must be increased if
the motor actuator cannot
maintain a stable position
when the system is
operating. Instability
causes the motor actuator
to oscillate (hunt).
Checkout Procedure
Use the installation sheet with
the motor actuator for
installation, operation, and
checkout.
in the clockwise direction. This
is the same action that occurs
when there is a decrease in the
sensed temperature at the
sensor. Turn the set point knob
to a setting below the sensed
temperature and the motor
actuator will return in the
counterclockwise direction.
If the unit does not operate,
check all components and wiring
connections.
Repairs and Replacement
Field repairs must not be made.
For a replacement electronic
board kit, contact the nearest
Johnson Controls Commercial
Systems wholesaler.
Terminology
Direct Output (Terminals X
and XD Jumpered)
An increase in temperature at
the sensor causes an increase
in the output signal, resulting in
CW motor rotation of the motor
actuator output shaft.
Reverse Output (Terminals X
and XR Jumpered
A decrease in temperature at
the sensor causes an increase
in the output signal, resulting in
CW rotation of the motor
actuator output shaft.
For Direct Output, turn the set
point knob to a setting below the
sensed temperature. The motor
actuator’s output shaft, as
viewed from the load end, will
rotate in the clockwise direction.
This is the same action that
occurs when there is an
increase in the sensed
temperature at the sensor. Turn
the set point knob to a setting
above the sensed temperature
and the motor actuator will
return in the counterclockwise
direction.
For Reverse Output, turn the set
point knob to a setting above the
sensed temperature. The motor
actuator’s output shaft will rotate
R81QAA Technical Bulletin
3
Controls Group
507 E. Michigan Street
P.O. Box 423
Milwaukee, WI 53201
4 R81QAA Technical Bulletin
Printed in U.S.A.