3-12 System Manual RC.IU.B1.22 4/99.1 AKCESS
Chapter 3 - 2 Installing I/O Network Boards: Power Supplies,
Enclosures and Alternative Mounting
Load Factors
and Power Supplies Each of the boards made for use in the I/O network has a load factor. There are three power supply
types. The IOPS will supply power to any group of boards whose load factors total 7 or less. The
IOPS2 will handle up to a load factor total of 26. The IOPSWM is a plug-in power supply which will
handle any single I/O device. The load factors of the I/O boards are as follows:
The IOPS Power Supply
The Danfoss IOPS power supply is designed to provide 12 VAC for a number of I/O boards with an
aggregate load factor of 7 or less. Be careful to observe the maximum power supply cable lengths given
in the table on the instruction sheet (there is a copy in Appendix B).
Line voltage to the power supply can be either 110 VAC or 220 VAC, and is selected by positioning a
plug-in jumper as for the AKC 55.
If 120 VAC power is applied to an IOPS power supply with the jumpers set for 220 VAC, and the output
voltage is connected to I/O boards, the green LED’s on the I/O boards will be lighted, but it will not be
possible to bring the I/O boards on line.
I/O Device Load Factor
RO8 or RO8S 2
SI8 1
OI8 or OIL8 1
VO2 1
LD 1000 2
OAB-1 1
OVR8 1
Dont let the
load factor
total exceed 7
on an IOPS !
AKCESS System Manual RC.IU.B1.22 4/99.1 3-13
The IOPS2 Power Supply
The Danfoss IOPS2 power supply is designed to provide 15 VDC for a number of I/O boards with an
aggregate load factor of 26 or less. Cable lengths from the IOPS2 power supply to I/O boards must be
in accordance with the table in the IOPS2 instruction sheet (there is a copy in Appendix B).
The IOPSWM
Power Supply The IOPSWM plugs into a 120 VAC outlet and supplies power to any single I/O device.
IO4R Enclosure The IO4R rainproof enclosure contains an IOPS power supply to provide 12 VAC to the I/O boards
mounted in it up to a load factor total of 7 (see the IOPS instruction sheet in Appendix B.
The IO4R enclosure has four 3" snap tracks and is designed to contain 4 full-size I/O boards (RO8, SI8,
or OI8). Since VO2 boards are comparatively short, one or more of the snap-tracks can be used for two
VO2’s. The enclosure is provided with rear mounting holes and has labeled cable knockouts for class 1
and class 2 wiring in both top and bottom.
IO12 Enclosures The IO12 enclosure series allow for mounting up to twelve I/O boards of any mixture per enclosure.
Each IO12 contains one or more IOPS power supplies as follows:
IO12-1 1 IOPS
IO12-2 2 IOPS
IO12-3 3 IOPS
IO12-4 4 IOPS
Alternative Mounting
for I/O Boards In OEM control panels or other enclosed spaces where the IO4R enclosure is not appropriate, snap
track for I/O boards can be mounted on any flat surface where codes and good electrical practice permit.
A Danfoss IOPS-series (IOPS, IOPS2, or IOPSWM) 12 VAC or 15 VDC power supply should be used
to provide operating voltage for I/O boards not mounted in Danfoss I/O enclosures.
3-14 System Manual RC.IU.B1.22 4/99.1 AKCESS
Chapter 3 - 3 Installing RO8 and RO8S Relay Output Boards
RO8 Description and
Identification RO8 and RO8S Relay Output boards are identical except for the override switches found on the RO8S
board. The RO8 Relay Output board provides 8 relay outputs in an AKC 55 system for control of a
variety of loads. Normally open, normally closed, and common terminals are furnished for each RO8
output. RO8 outputs are individually fused at 5 amps. Each output has an LED which lights when the
relay coil is energized.
Each RO8 or RO8S is supplied with two spare relay fuses in holders at the right edge of the board.
Since they are nodes on the I/O network, RO8 and RO8S boards communicate with a host AKC 55 over
TP-78K twisted-pair shielded cable.
The board’s name and version number are printed on the board as shown in the illustration below:
Mounting RO8 and RO8S boards are designed for 3" snaptrack mounting in either a Danfoss IO4R or IO12
enclosure, an OEM control panel, or other enclosed spaces. Snaptrack for I/O boards can be mounted on
any flat surface where codes and good electrical practice permit. A Danfoss power supply (IOPS-
series) should be used to provide operating power for I/O boards not mounted in a Danfoss IO4R or
IO12 enclosure. Select mounting locations so that the wiring distance between the RO8 and its power
supply is in accordance with the table on the appropriate IOPS-series instruction sheet (see Appendix
B).
AKCESS System Manual RC.IU.B1.22 4/99.1 3-15
Addressing an
RO8 or RO8S Each RO8 board connected to an AKC 55 must have a unique address in the range 01-99. The address is
set by the two rotary switches located side-by-side beneath the board’s “status” and “service” LED’s.
Each switch has an arrow pointer which serves also as a screwdriver slot. Use a small screwdriver to
rotate the arrowhead on each switch until the left arrowhead points to the first digit, and the right
arrowhead to the second digit of the correct address.
Network Connections RO8 and RO8S boards are connected to the I/O network at the terminal strip labeled “NETWORK”.
When connecting from board to board (point-to-point or “daisy-chain” wiring), use only twisted-pair
cable meeting the specifications given in the illustration below. There is no polarity to observe; connect
the two signal wires to the terminals labeled “A” and “B”, and the cable shield to the terminal labeled
“shield”.
Y
ou
ve
h
ear
d
t
h
is
before....Terminate
the last board on
every main I/O
cable run!
3-16 System Manual RC.IU.B1.22 4/99.1 AKCESS
Controlled Load
Connections Each load to be controlled is connected to a relay output by wiring to the common (“C”) and either the
normally open (“NO”) or normally closed (“NC”) screw terminal on one of the eight sets of terminals
along the bottom edge of the board.
RO8 Power
Connections As with all I/O boards in the AKC 55 system, 12 VAC from a Danfoss IOPS-series power supply is
connected to a terminal strip labeled “12 VAC” on the RO8 board. The power terminal strip is shown in
the upper left corner of the illustration.
Inspection of the
Installed RO8 When an RO8 Relay Output Board is ready for operation, you should be able to observe the following,
proceeding clockwise around the board from the power terminal strip:
1. Power (12 VAC or 15 VDC) has been connected to the “12 VAC” terminal strip.
2. The status LED should be blinking. If the status LED is off, there is no power to the board (check
the fuses). If the status LED is constantly on (not blinking), the board is not communicating with
its AKC 55. Make sure the AKC 55 has been configured for this board; if configured, there will be
information in at least one of the Board and Points screens; you can investigate, and supply
configuration information, if necessary, by following the procedures described in Section IV of this
manual.
3. The service LED will normally blink briefly when the network is scanned, but if the service LED
remains steadily on, or blinks repeatedly, the RO8 board is defective and should be replaced.
4. The address switches have been set to a valid address.
5. Loads are connected to one or more of the terminal strips numbered from 1 to 8. When a control
action by the AKC 55 causes a relay coil to be energized, the output’s LED lights.
6. Connection has been made to the I/O network of an AKC 55 at the “NETWORK” terminal.
7. If this board is the last node on a main run, make sure that it is terminated by using one of the
terminators supplied with the AKC 55.
Make sure the distance from
your IOPS-series power supply
to the I/O board is within the
limits given in the table in the
IOPS instruction sheet !
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Danfoss RO8S Relay Output Board Installation guide
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