Aimco Brakes Monitor ATM11 Tightening Monitor Operations Manual

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Programming (Thresholds):
Three thresholds exist within the ATM.  These thresh-
olds govern when the unit starts and stops collecting
data, when the unit is in cycle, and when the unit deter-
mines that the signal is “clutched out”.
Threshold 1 (THR1) acts as a cycle start level for all
types of ATMs.  When the analog signal on either chan-
nel is above THR1, the unit collects that data and stores
it in memory.  This data is used during the  AutoCal
TM
process or it can also be transmitted via the serial port to
an external device for analysis.
Threshold 2 (THR2) in most ATMs is used to determine
when the tool is running.  If the analog value rises above
THR2, either an accept or a reject is going to be report-
ed when the value falls back below THR2. 
Threshold 3 (THR3) is the level at which most tools are
considered to be clutched out.  When the ATM is set up
to monitor pneumatic tools, the tool is considered
clutched out when the pneumatic signal rises above
THR3.
1 
						

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Programming (Thresholds continued):
All three thresholds can be adjusted through the program
menu.  However, there is a software application avail-
able that makes this process much easier and much more
visual.
In order to adjust a threshold’s value, turn the key-
switch to PROG and press the MODE button until thedesired threshold abbreviation
is in view (THR1, THR2, or
THR3).  While the threshold
abbreviation is on the display,
press the SET button.
After the SET button is pressed, the value for the thresh- old will appear on the display
with the left most digit flash-
ing.  The UP and DOWN but-
tons may be employed to
adjust the flashing digit.  Once
the digit is at the desired value, the SET button may be
pressed and the second digit will begin to flash.
After editing the second digit, pressing SET will store
the new threshold value to the current parameter set.
Pressing the MODE button at any time will take the unit
back to the program menu.
The key may also be turned back to the LOCK in order
to abort the process and leave program mode.
2
THR3
73 
						

							22
Programming (Firmware Versions):
The final two elements in the program menu are the
firmware versions.  There are two microcontrollers
inside the AIM Tightening Monitor (on the front board
and one on the back board).
Over time, new code releases may be issued to add cus
tomer requested functionality or to fix an occasional
bug.  If new firmware is released, it is given another
version number.To determine the firmware
versions that are running in
any given AIM Tightening
Monitor, turn the key to PROG
and press the MODE button
until the display read FX.XX
or BX.XX.
In the examples to the left,
F1.14 stands for frontboard
firmware version release number 1.14.  The B2.93
stands for backboard firmware version release number
2.93.
2
F1.14
B2.93 
						

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Examples:
The following examples were captured using the AIM
Tightening Monitor and the Cyber Q software.  
Direct Drive Pneumatic Tool:
The pneumatic signature was downloaded from a AIM
Tightening Monitor that was monitoring a pneumatic
direct drive tool.  The analog curve has two distinct
phases; the rundown phase, and the clutch out phase.  If
either of the phases were to be missing (or too short as
determined by a timer), the fastening cycle would be
considered a reject.
During the rundown portion of the curve (prior to the
fastener seating), the analog value is at roughly 50% (or
50 psi).  After the fastener seats and the clutch turns the
tool off, the pressure rises up to roughly 75% (or 75
p
THR3
THR2
THR1
TminTclu
psi).
2 
						

							24
Examples(Pneumatic Direct Drive continued):
In order to properly qualify this process, THR1 is set
around 7 psi.  So, once the pressure rises above 7 psi,
the ATM starts collecting data.  Once the pressure drops
back down below 7 psi, the ATM stops collecting data.
THR2 in this example is set to 25 psi.  Once the pres
sure rises above 25 psi, the ATM considers the tool to be
running and will either give an accept or some form of
reject at the end of the cycle. 
THR3 is set to approximately 65 psi in this example.
That value is both greater than the run down value of 50
psi and well below the shut off pressure of 75 psi.
TMIN governs the minimum amount of time that the
pressure must be in the rundown phase prior to clutch
ing out.
TMAX governs the maximum amount of time that the
pressure can be in the rundown phase prior to the clutch
shutting the tool off.
TCLU sets the minimum amount of time that the pneu
matic signal has to be above THR3 after the clutch shuts
the tool off.
2 
						

							25 25
Example (Direct Drive Double Hit):
In the example above, a direct drive pneumatic tool was
used to retighten a fastener that had previously been
tightened.  In this curve no rundown phase exists.  The
clutch immediately turns the tool off and therefore
TMIN is violated.  A reject occurs upon the completion
of a run like this one.
Example (Direct Drive No Clutch):
In the example above, a direct drive pneumatic tool was
not allowed to tighten its fastener completely.  The
process was stopped prior to the tool clutching out and
therefore the pressure never rose above THR3.  TCLU
was violated and a reject occurred
2
THR3
THR2
THR1Tmin
THR3
THR2
THR1 
						

							Examples (Pneumatic Pulse Tool):The example above is a curve from a pneumatic pulse
type tool.  This curve has three phases.  The first phase
is the run down of the fastener prior to the head of the
fastener seating.  This initial phase occurs around 40 psi.
The second phase of this fastening process is the pulsing
phase.  The pulsing phase occurs around 53 psi.  During
this phase, the tool is incrementally adjusting the fasten-
er’s torque slightly upward.  The final phase occurs
when the clutch shuts the tool off and the pressure rises
to approximately 74 psi.
THR1 in this example has been set to about 7 psi.  This
is the point at which data collection will start and stop.
THR2 sets the point at which the tool is considered on.
After the pressure rises above this threshold, either an
accept or reject will be generated upon the completion
of the fastening sequence
2
THR3
THR2
THR1
TminTclu
26 
						

							In this example, THR2 is set between the run-down
phase and the pulsing phase.  THR2 could be set below
the run-down phase, however, a reject will be generated
each time the trigger on the tool is pulled.  
If THR2 is set between the run down phase and the
pulsing phase, the tool will have to pulse before any sta-
tus (such as an accept or reject) is generated.
THR3 is set between the upper peaks of the pulsing
phase and the shut-off pressure.  Once the pressure rises
above this level, the tools is considered clutched out.
TMIN governs the minimum amount of time that the
pressure must be in the run-down phase prior to clutch-
ing out.
TMAX governs the maximum amount of time that the
pressure can be in the run-down phase prior to the clutch
shutting the tool off.
TCLU sets the minimum amount of time that the pneu-
matic signal has to be above THR3 after the clutch shuts
the tool off.
2
2\b 2\b 
						

							Example (Pulse Tool No Clutch):
In the example above a pneumatic pulse tool was  not
allowed to tighten its fastener completely.  The process
was stopped prior to the tool clutching out and therefore
the pressure never rose above THR3.  TCLU was violat
ed and a reject occurred
Example (Pulse Tool Double Hit):
In the example above a pneumatic pulse tool was used
to retighten a fastener that had previously been tight
ened.  This curve spends a very brief period between
THR2 and THR3 (the rundown phase).  The clutch
immediately turns the tool off and therefore TMIN is
violated.  A reject occurs upon the completion of a run
like this one.
2
THR3
THR3
THR2
Tmin
28 
						

							I/O (RS232):
Below the parameter selection knob is a 9pin D sub
miniature connector.  Through the use of this connector
and a NULL MODEM cable (see diagram below), a
computer or another serial device can communicate with
the AIM Tightening  Monitor.
Pin 2 on this connector is the RX or receive pin.  Pin 3
is the TX or transmit pin.  Pin 5 is at ground potential.
The ATM communicates asynchronously through this
port at 9600 baud using an 8 bit, no parity, one stop bit
structure.
A windows based program is available for communicat
ing with the AIM Tightening Monitor.  This program
may simplify the setup and the adjusting of parameters.
A document specifying the serial protocol that the AIM
Tightening Monitor speaks is available upon request
from Aimco or one of their agents.
2
29 29