1. The Turnover Prevention Device
Lifting With Your SPYDERCRANE
KBT 5.3
Welcome to Lesson Topic Topic 5.3, the Turnover Prevention Device.

2. Topic Overview and Contents
This Topic (The Turnover Prevention Device) is designed to provide you with an understanding of how the Turnover Prevention Device (TPD) works
You will learn about:
The various components that comprise the TPD
How the TPD Works
How the TPD works with the Crane Management Unit (CMU)
Practical Use
It is YOUR RESPONSIBILITY to read and understand the user manuals included with your SPYDERCRANE and the warning decals posted on it
This Topic covers the 095- and 200-Series SPYDERCRANE
The Turnover Prevention Device (or, TPD) is probably the most important operator aid that the 095- and 200-Series SPYDERCRANE is equipped with. In this Lesson Topic, you will learn how the TPD works and how to use it to conduct safe lifting operations.

3. Learning Objective(s)
The learning objectives for this Lesson Topic are for each student to…
DLO 5.3.1: Explain the function and purpose of the TURNOVER PREVENTION DEVICE.
DLO 5.3.2: Describe the various components of the TURNOVER PREVENTION DEVICE.
DLO 5.3.3: Describe, generally, how the TURNOVER PREVENTION DEVICE works.
DLO 5.3.4: Explain the relationship between the TURNOVER PREVENTION DEVICE and the CRANE MANAGEMENT UNIT. 
DLO 5.3.5: Describe the two ALERT CONDITIONS for the TURNOVER PREVENTION DEVICE.
DLO 5.3.6: Explain what you should do when alerted by the TURNOVER PREVENTION DEVICE.
These are the desired learning objectives for this Lesson Topic

4. What the Turnover Prevention Device Does
Acts as an OVERTURN PROTECTION SYSTEM
Serves the same purpose as the conventional Load Moment Indicator (LMI) system
Measures the SPYDERCRANE’s stability in real-time
Generates TPD WARNING alarm when attached load is equal to 80% of the SPYDERCRANE’s load moment
Generates TPD LOCKOUT alarm when attached load is equal to 90% of the SPYDERCRANE’s load moment
The Turnover Protection Device (or, TPD) is a SPYDERCRANE unique component that acts as an overturn protection system for your 095-, or 200-Series Micro-Crawler
In practice, the TPD serves the same purpose as the conventional LMI system equipped to conventional mobile cranes
While the LMI is a logic-based system, the TPD measures the SPYDERCRANE’s stability in real-time
During lifting operations, when you increase your SPYDERCRANE’s working radius to the point that the load moment measured at the boom-tip is equal to 80% of the SPYDERCRANE’s load moment, the TPD Warning Alarm is sounded
If you continue to increase the working radius until the load moment is equal to 90% of the PSYDERCRANE’s load moment, the TPD Lockout Alarm is sounded
At lockout, the SPYDERCRANE will also lock-out, or disconnect the BOOM OUT, BOOM DOWN, SLEW, and HOIST commands
Also disconnects BOOM OUT, BOOM DOWN, SLEW, and HOIST commands

5. TPD Components The TPD is composed of two major components:
The TPD LOAD CELL (x4)
Detects and measures pressure at each outrigger
Load Sensors (x4)
Installed in the Upper Outrigger
TPD Amplifier
The TPD AMPLIFIER
Gathers the pressure data from each Load Cell and compares them
URW295CP1URS
The TPD is composed of two major components
The TPD Load Cells are installed in each outrigger and are designed to measure the ground pressure exerted at the outrigger contact point, where the outrigger touches the ground
The TPD Amplifier receives the pressure data from the load cells as compares the data between pairs of outriggers
The TPD also runs in parallel with the Crane Management Unit, when the TPD detects instability, it coordinates with the CMU to generate audible and visual alerts, as well as function kick-outs when the SPYDERCRANE becomes unstable.
Determines stability status of the SPYDERCRANE based on the differences in pressure between OUTRIGGER PAIRS
Communicates with the CMU to provide stability alarms and function kick-out (FKOs)

6. TPD Amplifier Status Panel
Receives Load Cell data and compares
Indicates Load Cell status with orange lights
Channels A-D correspond with Outriggers #1-4
The TPD Amplifier works with the CMU and generates audible alerts, but, it also includes an status panel that you can use to determine how the system is operating and diagnose problems. Channels A through D correspond to Outriggers 1 through 4.
URW295CP1URS

7. TPD and The Turnover Point
The weight of the SPYDERCRANE’s carrier of generates Load Moment at the four outrigger contact points
The load suspended from the SPYDERCRANE’s hook also generates Load Moment
As the Load’s Load Moment increases, the pressure at the outrigger contact points between the SPYDERCRANE and the load also increases
As the ground pressure at the outriggers between the SPYDERCRANE and the load increases, the ground pressure at the outriggers on the opposite side of the SPYDERCRANE decreases
To better understand how the TPD works, you need to understand Load Moment. Load Moment is similar to torque in that it measures the weight (or force) of an object multiplied by the distance from a turning point. In practical terms, you can think of load moment as the perceived weight of a load. Just like a bag of groceries seems to weigh much more when you hold your arm out versus letting it hang by your side, the load carried by the crane generates more load moment the further it is from the crane.
The SPYDERCRANE generates Load Moment at the four outrigger contact points.
The load suspended from the hook also generates load moment
As you increase the working radius of the boom you are also increasing the load’s load moment.
The pressure measured at the outrigger contact point, or points, between the load and the SPYDERCRANE increases as the load’s load moment increases
The pressure measured at the outrigger contact point, or points, on the other side of the SPYDERCRANE from the load decreases.
When the load moment generated by the load is greater than the load moment generated by the SPYDERCRANE, the Turnover Point is reached and the SPYDERCRANE will overturn

8. TPD Load Cell Pairs
The TPD measures the ground pressure for PAIRS of ADJACENT Load Cells 2 3
i.e., Outriggers 1+2, 2+3, 3+4, 4+1
The TPD only measures the light-side outriggers
Once the ground pressure at the light-side falls to 20% of the SPYDERCRANE’s load moment (80% turnover), it generates a TPD Warning 1 4
The TPD is composed of two major components
The TPD Load Cells are installed in each outrigger and are designed to measure the ground pressure exerted at the outrigger contact point, where the outrigger touches the ground
The TPD Amplifier receives the pressure data from the load cells as compares the data between pairs of outriggers
The TPD also runs in parallel with the Crane Management Unit, when the TPD detects instability, it coordinates with the CMU to generate audible and visual alerts, as well as function kick-outs when the SPYDERCRANE becomes unstable.
Once the ground pressure at the light-side falls to 10% of the SPYDERCRANE’s load moment (90% turnover), it generates a TPD Lockout

9. When the loaded boom is over Outrigger #3, its Load Cell is registering increasing pressure (“getting heavy”)
Outrigger #1 is registering decreasing pressure (“getting light”); Outriggers #2 and #4 are neutral 2 3
TPD Amplifier registers that only ONE Load Cell is getting light and ignores it; three outriggers are still stabilizing the SPYDERCRANE 1 4
To better understand how the TPD works, you need to understand Load Moment. Load Moment is similar to torque in that it measures the weight (or force) of an object multiplied by the distance from a turning point. In practical terms, you can think of load moment as the perceived weight of a load. Just like a bag of groceries seems to weigh much more when you hold your arm out versus letting it hang by your side, the load carried by the crane generates more load moment the further it is from the crane.
The SPYDERCRANE generates Load Moment at the four outrigger contact points.
The load suspended from the hook also generates load moment
As you increase the working radius of the boom you are also increasing the load’s load moment.
The pressure measured at the outrigger contact point, or points, between the load and the SPYDERCRANE increases as the load’s load moment increases
The pressure measured at the outrigger contact point, or points, on the other side of the SPYDERCRANE from the load decreases.
As the boom is slewed towards Outrigger #4, it begins getting heavy
Outriggers #1 and #2 begin getting light

10. Working radius is being increased; moving the load further from the deployed SPYDERCRANE
Outriggers #3 and #4 are getting heavy as the load’s Load Moment increases
SPYDERCRANE is beginning to tip as load begins pulling Outriggers #1 and #2 off the ground
TMP Amplifier provides a Warning Alarm when the SPYDERCRANE is at 80% of turnover
To better understand how the TPD works, you need to understand Load Moment. Load Moment is similar to torque in that it measures the weight (or force) of an object multiplied by the distance from a turning point. In practical terms, you can think of load moment as the perceived weight of a load. Just like a bag of groceries seems to weigh much more when you hold your arm out versus letting it hang by your side, the load carried by the crane generates more load moment the further it is from the crane.
The SPYDERCRANE generates Load Moment at the four outrigger contact points.
The load suspended from the hook also generates load moment
As you increase the working radius of the boom you are also increasing the load’s load moment.
The pressure measured at the outrigger contact point, or points, between the load and the SPYDERCRANE increases as the load’s load moment increases
The pressure measured at the outrigger contact point, or points, on the other side of the SPYDERCRANE from the load decreases.
TMP Amplifier provides a Lockout Alarm when the SPYDERCRANE is at 90% of turnover
At 90%, CMU commands a function kick-out for BOOM DOWN, BOOM SLEW, BOOM OUT, and HOIST

11. How the TPD Works: Visual
TS-100
RUN
TPD Warning
ERR
ch. D
Code Indicator
ch. C
“Nearing Turnover Threshold” 16
ch. B
ch. A
Code 16 is only a warning, and none of the SPYDERCRANE functions have been locked out, or limited.
ZERO
RESET

12. How the TPD Works: Visual
TS-100
RUN
TPD Lockout
ERR
ch. D
Code Indicator
ch. C
“Turnover Threshold Reached” 15
ch. B
ch. A
The Code 15 includes function kick-outs for SLEW, HOIST, BOOM DOWN, and BOOM OUT.
ZERO
RESET

13. The TPD in a Nutshell
The TPD is a PASSIVE Operator Aid: it only requires operator intervention as an exception
The TPD is constantly monitoring the pressure conditions at each outrigger
The TPD alerts the operator when the ground pressure values of two ADJACENT outriggers falls within 80% of the stability limit of the deployed SPYDERCRANE
The TPD will signal the CMU to FKO BOOM DOWN, BOOM OUT, HOIST, and SLEW when the pressure values are within 90% of the stability limit of the deployed SPYDERCRANE
The PRIMARY alerting mechanism is audible; you will hear the TPD Buzzer signal Warning (intermittent) and Lockout (solid tone)
These are the most important points to remember about the TPD system
The TPD is constantly monitoring the pressure conditions at each outrigger
The TPD alerts the operator when the ground pressure values of two ADJACENT outriggers falls within 80% of the stability limit of the deployed SPYDERCRANE
The TPD will signal the CMU to FKO BOOM DOWN, BOOM OUT, HOIST, and SLEW when the pressure values are within 90% of the stability limit of the deployed SPYDERCRANE
The PRIMARY alerting mechanism is audible; you will hear the TPD Buzzer signal Warning (intermittent) and Lockout (solid tone)
The TPD Amplifier is also used to monitor/diagnose the TPD System
The CMU Code Indicator is a SECONDARY alerting mechanism
The TPD Amplifier is also used to monitor/diagnose the TPD System
The CMU Code Indicator is a SECONDARY alerting mechanism

14. The TPD in Practical Lifting Operations
To use the TPD, just conduct your normal lifting operations
Make all boom movements slow and deliberate
Avoid sudden starts and stops
When the TPD WARNING sounds, consider where the load is in relation to the SPYDERCRANE and consider whether you can continue (will the working radius increase much more?) or recover (can I reduce the working radius and still finish the lift?)
For maximum efficiency and safety when using a TPD-equipped SPYDERCRANE you should:
Make all boom movements slow and deliberate
Avoid sudden starts and stops
When the TPD WARNING sounds, consider where the load is in relation to the SPYDERCRANE and consider whether you can continue (will the working radius increase much more?) or recover (can I reduce the working radius and still finish the lift?)
If the TPD LOCKOUT sounds, you MUST begin load recovery: you can only BOOM UP, BOOM IN, and WINCH DOWN
If the SPYDERCRANE FKOs and the TPD Buzzer DOES NOT sound, check the CMU Code Indicator for Code 15 (Lockout) and check the TPD Buzzer Mute to make sure it is turned ON
If the TPD LOCKOUT sounds, you MUST begin load recovery: you can only BOOM UP, BOOM IN, and WINCH DOWN
If the SPYDERCRANE FKOs and the TPD Buzzer DOES NOT sound, check the CMU Code Indicator for Code 15 (Lockout) and check the TPD Buzzer Mute to make sure it is turned ON

15. Learning Objective(s)
The desired learning objectives for this Segment Topic is for each student to…
Explain the function and purpose of the TURNOVER PREVENTION DEVICE
Describe the various components of the TURNOVER PREVENTION DEVICE
Describe, generally, how the TURNOVER PREVENTION DEVICE works
Explain the relationship between the TURNOVER PREVENTION DEVICE and the CRANE MANAGEMENT UNIT
Explain the TWO ALARM CONDITIONS for the TURNOVER PREVENTION DEVICE
Explain the TWO ALERT ACTIONS related to the TURNOVER PREVENTION DEVICE ALARM CONDITIONS
This concludes Segment Topic 5.3