RCbenchmark 1780 Series User manual
Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
Series 1780 75kgf Dynamometer
User Manual V1.1
Manual SKU#: ZXMJ
Image above shows the Series 1780 75kgf, with the power sensor, the ESC, the motor, the propeller and ground support sold separately.
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
Table of contents
Chapter 1: Introduction 5
1.1 Item checklists for your dynamometer 6
1.1.1 Series 1780 Dynamometer 75kgf-500A: Single-motor (SKU#:KURKE) 6
1.1.2 Accessories 7
Chapter 2: General safety rules 8
Chapter 3: Ground fixations and enclosure 11
3.1 Mounting options 11
3.1.1 With concrete screws 11
3.1.2 Plywood on the floor 11
3.2 Build your own enclosure 14
3.2.1 Design and build your own enclosure 14
Chapter 4: Series 1780 Installation 15
4.1 Ground support 16
4.1.1 What’s included and where to find the parts 17
4.1.2 Assembly the upper part of the support 19
4.1.3 Assembly the lower part of the support 22
4.1.4 Final assembly of the support 24
4.2 Load measurement unit 28
4.2.1 Storage, calibration and warranty 28
4.2.2 What’s included 29
4.2.3 Mount load measurement unit to the support 30
4.2.4 Installation of the mechanical safety stop 33
4.2.5 Dismounting the load measurement unit from support 35
4.3. Motor, motor mount and optical RPM probe 36
4.3.1 What’s included 37
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
4.3.2 Install your motor onto the motor mount 37
4.3.3 Install the optical RPM probe on the motor mount 38
4.3.4 Install the motor mount assembly on the load measurement unit 41
4.4 Power and control console 46
4.4.1 Introduction of the Series 1780 75kg Power and Control Console 46
4.4.2 What’s included and where to locate the components 46
4.4.3 Fixing the ESC on the support frame 47
4.4.4 Fixing the power and control console on the support plate 49
4.5 Main board 52
4.5.1 What’s included 53
4.5.2 Attach to the stand or on the ground 54
4.6 Tightening with a torque wrench 55
Chapter 5: How to connect electrical components 56
5.1 Electrical safety rules 56
5.2 Sensor chain 57
5.2.1 Optical RPM probe and force sensor 57
5.2.2 Power sensor 58
5.2.3 Temperature probe 58
5.2.4 Air-speed probe 58
5.3 Control chain 58
5.3.1 Power and control console 58
5.4 Main board and PC 59
5.5.1 Indicator lights 59
5.4.2 Power and USB to your PC 60
5.4.3 Buzzer and safety cut-off switch 60
5.5 Cable management 60
Chapter 6: Using the RCbenchmark software 61
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
6.1 Connecting to the tool 62
Chapter 7: Upgrade, warranty and technical support 63
7.1 Technical support 63
7.2 Upgrade your products 63
7.3 Product’s warranty 64
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
Chapter 1: Introduction
This is the user manual for customers who purchased the Series 1780 Dynamometer
75kgf-500A. The goal of this manual is to demonstrate all important information about
preparing, assembling and using this dynamometer. If you need the user manual for the
original Series 1780 Dynamometer 25 kgf V1 or the Series 1780 Dynamometer V2 25kgf-100A or
40kgf-150A, please contact us.
The user manual of the Series 1780 is regularly updated. To ensure you have accurate
information up to date information, please download the latest PDF copy from our website:
https://rcbenchmark.gitlab.io/docs/en/
IMPORTANT!
We highly recommend that all operators who will be working with this machine carefully
read this user manual in its entirety before carrying out any operation on the Series 1780.
Please note that not following the instructions in this user manual may result in testing
errors, malfunction of the dynamometer, serious injuries, or death of the operator.
In this manual, any text following a # represents the RCbenchmark SKU# for this item. You
may refer to this number to order spare parts.
The Series 1780 dynamometer contains several major units: the load measurement units, the
power and control console, the main board, and the fixtures. Every box may contain one or
multiple bags of fasteners. Please keep them in boxes until you need to use them.
The load measurement unit, the 75kgf-40Nm A side (#FVET) is extremely sensitive to any
external forces outside its rated output. The load measurement unit comes with a protective
shell in its own boxes. Do not take it out until you need to mount it onto the support.When
you unmount the load measurement unit from the support, please place it back into the
protective casing. For further information about how to store and keep a valid warranty on
this unit, please refer to section 4.2.1 of this manual.
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
1.1 Item checklists for your dynamometer
Before you use these checklists, please check which configuration you purchased from us. If
unsure please contact us.
1.1.1 Series 1780 Dynamometer 75kgf-500A: Single-motor (SKU#:KURKE)
Please check the following items are in the carton:
●Load measurement unit 75kgf-40Nm: A side (SKU#: FVET) x1
●Mono main board V2 (SKU#: RHGQ) x1
●Main board power adapter (SKU#: PGAC) x1
●Power & control console 100A-500A: A side (SKU#: EMDG) x1
●Accessories and fasteners for assembly box (SKU#: BCJE) x1
●Heavy load motor mount V2 (SKU#: XSWU) x1
●General user manual 75kg (SKU#: ZXMJ) x1
●Mechanical safety stop (SKU#:LXCM) x1
The following items will be in separate individual boxes:
●Beam Package box 1 (SKU#:TJLD) x1
●Beam Package box 2 (SKU#:YXHR) x1
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
1.1.2 Accessories
If you purchased any of these accessories, you can find them in the carton that comes with
your Series 1780 Dynamometer :
●Series 1780 temperature probe (SKU#: JTKB)
●Series 1780 air-speed probe (SKU#: BJPK)
The Series 1780 Dynamometer 75kgf-500A is a stand-alone product. It includes the necessary
fasteners and support plates. You DO NOT need the ground railing system for this version of
the dynamometer.
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
Chapter 2: General safety rules
Always put safety first! It is your responsibility!
It is extremely important to stay alert and to know how each item works. Read this part for
yourself, and make sure all your colleagues who will be potentially working on the Series
1780 have carefully read this guide before using the dynamometer.
This part will not cover details about how to assemble the Series 1780 Dynamometer, or how
to connect the electrical components. For these operations, please refer to their proper
chapters within this manual. However, you should still read through this chapter before
moving on to the next steps.
The following instructions apply on both operating and maintenance personnel and must be
followed during all phases of operations, service, testing and repair of this instrument.
To ensure safety, please follow these instructions:
1. Before construction make sure all your tools are in good condition and don’t need to
be replaced. Learn the tools applications, limitations, and possible hazards.
2. Inspect all fasteners before every experiment and as often as possible.
3. Make sure to use properly rated cables for the power.
4. Do not use power tools in the presence of flammable liquids or gases.
5. Always keep your work area clean, do not work on surfaces that are dirty with oil.
Small metal chips may be blown up and hit the propeller by accident. Clean your
testing room before every test.
6. Respect the Murphy’s law. If you think something might go wrong, it will.
7. Make sure you are dressed for safety. The load cell parts may be sharp, wear gloves
all along the assembly. Do not wear jewelry or inappropriate clothing when operating
the tool.
8. Do not let children around the Series 1780 dynamometer.
9. Never force the tool to do a job for which it was not designed or outside its
specifications. Using the tool outside of its official specifications will void the
warranty and is at your own risk.
10. Do not use or assemble the tool alone.
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
11. Do not substitute parts or modify the instrument.
12. Always disconnect the power source before making adjustments, changing parts,
cleaning or working on the tool.
13. Do not store anything near or above the tool, especially when it is in function.
14. Always keep your tools clean and in good working order.
15. Do not operate the tool if you are under the influence of drugs, alcohol, or medication
that may affect your ability to properly use the tool.
16. Do not open and touch the electrical circuits inside the enclosures (Power & control
control, Main board, Force sensor circuit). Do not change or modify the electrical
circuit.
17. Respect the manufacturer’s specification concerning the power, voltage and current
of the motors that you use on the Series 1780 Dynamometer.
18. Make sure you are running all your tests in a safe space. The tool should be fenced off
so unsuspecting personnel cannot enter the test area. Build a safety cage around the
test area. Before a test, assume the propeller will break, and check if there is a risk of
injury debris bouncing coming directly from the propeller or bouncing off walls.
19. The safety cage or the enclosure should be suitably rated for containing a propeller
failure. It should also protect operators in case the Series 1780 comes apart (loose
screw or mechanical failure).
20. Make sure nobody is in the room or near the propeller when the motor tested is
powered.
21. Wait for the propeller to stop spinning and for voltage measured at the ESC to be 0
before accessing the testing area.
22. Make sure all the parts have time to cool down after all tests, unless this is part of the
test design. The motor, ESC, batteries and wires may be hot. Please keep a fire
extinguisher available.
23. Make sure a protective surface is between you and the propeller in function. Wear
protective glasses at all times while in the testing room.
24. For the installation of the components in the Series 1780, please always refer to the
proper chapter in this manual. Always use the supplied fasteners and use a torque
wrench when specified. Confirm the structure’s rigidity every time before any tests.
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
25. Unbalanced propellers and extreme vibrations can lead to fatigue failure of some
aluminum components and/or the load cells. Please ensure the unit is completely
enclosed in the safety area and inspect all parts before performing a test.
26. Note that unbalanced propellers may cause resonances and powerful vibrations. It
may result in structure failure, and can endanger someone. If you find your structure
vibrating due to resonances, stop the test immediately.
27. If you are using your own fixtures to support the measurement tool, make sure that
they are rigid and solid enough to support your loads.
28. Ground railing systems and enclosures must be properly secured to the ground.
29. Do not approach the Series 1780 before cutting off the power.
30. If using ground rails, after each adjustment of position, ensure the fasteners between
the fixture plate and the rail are properly tightened.
31. Never forget about the lock washers, they are important to due to the high vibration
from the propulsion system.
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
Chapter 3: Ground fixations and enclosure
IMPORTANT!
You should prepare the ground fixtures before assembling the Series 1780 Dynamometer.
3.1 Mounting options
IMPORTANT!
Using no fixture, or leaving the Series 1780 improperly secured may cause permanent damage
to the load measurement unit, or cause damage to your facility, or even cause casualties.
Check the safety guide for more information.
3.1.1 With concrete screws
The prefered mounting method is on a concrete floor with concrete screws. Please use
screws in all the l-brackets of the base. The screws should have a pull out rating of at least
100 kgf each.
3.1.2 Plywood on the floor
If your facility does not allow you to drill into the concrete flooring, you may use a large
piece of plywood and place heavy weights at each corner of the plywood, along with rubber
pads to increase friction between the plywood and the floor. There is a high bending moment
at the base of the tool, so make sure to use washers and a sufficiently thick plywood to
handle it. The screw heads can easily break through the plywood under heavy load. It is your
responsibility to make the base of your structure suitable for supporting the Series 1780.
To use the plywood, please make sure to have enough counter-weights on each corner of the
plywood.
Example
Build a 3x1.7x0.04m plywood panel. The density of plywood is about 680 kg.m³, so your total
weight should be close to 160kg (140kg of plywood and 20kg for the structure). You should fix
your panel on the ground. We suggest to drill eight holes in the panel and fix it onto levelling
mounts, as shown on Fig 3.1 and Fig 3.2:
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
Fig 3.1: Levelling mounts on the plywood
Fig 3.2: Location of holes for the levelling mounts (dimensions in mm)
In addition to levelling mount, our calculations suggest using four counter weights of 40kg
each. You could place your weights at the four corners of the tool as shown in Fig 3.3:
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
Fig 3.3: Installation of weight on the plywood
To finish the installation of the plywood panel, you will also need to drill holes in the panel
at the location of the L-brackets. Chapter 4.1.2 will specify the position of the L-brackets.
Fig 3.4: Fix L-bracket on the plywood
The L-brackets can be used for M8 or 5/16” screws and bolts. If feasible, please add lock
washers in order to avoid negative effects from vibration.
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
3.2 Build your own enclosure
IMPORTANT!
Having the propeller spinning in an open area, and running tests without proper casing, duct,
cage or enclosure can be extremely dangerous to the operators and the facility.
You must have strong enough material for the enclosure, especially in the plane of the
spinning propellers. The material should be capable of absorbing the energy from the debris
of propellers.
3.2.1 Design and build your own enclosure
For security reasons, it is important that:
●Your enclosure is large enough to hold your propellers
●The panel walls can absorb energy from debris
●The structure is strong enough to hold the thrust under vibration
Before starting to design the enclosure, please know what size of propellers you are planning
to test. Generally speaking, you should leave at least 12” (300mm) distance from the
propeller’s blade tips to any panel wall made of a mesh. Solid panels should be at least one
radius away from the tip of the propeller
For example, if you are planning to test a 60” propeller, you should design your safety cage at
least 84” wide and 84” high if the wall is a mesh.
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
Chapter 4: Series 1780 Installation
We suggest designing and building the safety area and enclosure prior to Series 1780
assembly and installation. For the 75kgf-500A version of the Series 1780, you will need to drill
holes to the concrete. If you are unable to do so, please refer to chapter 3.1 and use plywood
with sandbags or similar weights as an alternative.
In this chapter, we will present you a guide to install the Series 1780 Dynamometer. Every
section in this chapter represents the suggested procedure to assemble and install the Series
1780, please follow the sequence accordingly and do not bypass any operation.
When you are ready to start with the Series 1780 installation, please first prepare the correct
tools for the operations. You can find inside the package a bag of hand-tool (SKU#: AMXZ) in
the assembly box (SKU#: BCJE), which includes several sizes of allens keys and wrenches. If
you are using your own tools please make sure to have the proper drive sizes.
Fig. 4.1: Allen keys Fig. 4.2: Wrench
Please follow this procedure sequence to install the Series 1780:
1. Ground support
2. Load measurement unit
3. Motor, motor mount and optical RPM probe
4. Power and control console
5. Main board
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
4.1 Ground support
The support is the largest mechanical structure of the Series 1780. It was designed to connect
the load measurement unit to the ground fixture. You may also use it to fix your ESC, the
power and control console on it.
Fig. 4.3: 75kgf version ground support
IMPORTANT!
This structure was designed and tested to hold loads and vibrations from a single propeller
producing the maximum rated thrust. You must follow the instructions to properly assemble
the structure and firmly tighten all the supplied fasteners. Loose fasteners are very
dangerous during a test.
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
4.1.1 What’s included and where to find the parts
Item name
Item SKU
Qty
Located in (SKU# if exist)
T-slotted single beam 4’ long
HJXQ
2
75kgf Stand Structure Box 1 (#TJLD)
T-slotted single beam 7” long
NWGF
2
75kgf Stand Structure Box 1 (#TJLD)
T-slotted single beam 10” long
FUBH
2
75kgf Stand Structure Box 1 (#TJLD)
T-slotted double beam 4” long
WHXZ
2
75kgf Stand Structure Box 1 (#TJLD)
T-slotted double frame 3’ long
LNKY
2
75kgf Stand Structure Box 2 (#YXHR)
Aluminum side rod
DUSQ
2
75kgf Stand Structure Box 2 (#YXHR)
Diagonal beam 6” long
(pre-assembled with fasteners)
QFGJ
2
Accessories and fasteners box
(#BCJE)
Diagonal beam 12” long
(pre-assembled with fasteners)
JTKA
2
Accessories and fasteners box
(#BCJE)
Rectangular tube profile
XLGF
2
Accessories and fasteners box
(#BCJE)
L Bracket
KPHT
10
Accessories and fasteners box
(#BCJE)
Gusset Bracket
YKPV
10
Accessories and fasteners box
(#BCJE)
Black hook and Loop cable ties
LFYX
6
Accessories and fasteners box
(#BCJE)
Please note that gusset brackets are L brackets with reinforced walls on the side. These
gusset brackets provide extra strength and are reserved for certain mounting areas.
Here is the list of items per bag:
Beam fasteners bag (SKU#: WVKM)
Item name
Item
SKU
Qty
Button head 5/16-18” screw 11/16”
long
KEDB
34
End-feed T-nut 5/16-18”
YREC
38
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
Profile plate fasteners bag (SKU#: QSCV)
Item name
Item SKU
Qty
Socket head 5/16-18” screw 1-½“
long
STHN
4
Washer 5/16
BLGN
4
Spacer 5/16”-¾“ long
AEUG
4
Load measurement unit and motor mount fasteners bag (SKU#: VQMD)
Item name
Item SKU
Qty
Spacer M5x19mm
MVAK
6
Washer M5
4N9T
6
Screw M5x0.8mm-40mm
QACR
6
Nylon-insert lock nut M5x0.8mm
BAKT
6
Socket screw M5x12mm
2HEX
9
Standoff M5-20mm M-F
CTKG
9
Lock washer M5
T9DQ
9
Serrated flange lock nut M5x0.8mm
YTEX
18
Hand Tools bag (SKU#: AMXZ)
Item name
Item SKU
Qty
Allen key 3/16”
TRHE
1
Allen key ¼“
QYHR
1
Allen key 4mm
5WUH
1
Wrench 8mmx10mm
9AGF
1
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
To avoid mistakes using wrong screws in the Series 1780 assembly, please keep the fasteners
in the bags until you need to use them. We did not prepare any spare fasteners in the bags
except for the motor mounting. Keep all the empty fastener bags in case that you need to
disassemble the structure, and place the fasteners back in those bags with labels.
4.1.2 Assembly the upper part of the support
Please follow these instructions to assemble the support:
❏Unpack the stand structure box 1 (#TJLD), and get two T-slotted single beams 7” long
(#NWGF) and two T-slotted single beams 4’ long (#HJXQ).
❏Place all these four T-slotted frames (#NWGF and #HJXQ) on a work table.
Fig. 4.4: T-slotted frame 4’ long (#HJXQ)
❏Open the beam fasteners bag (#WVKM) from the accessories and fasteners for
assembly box (#BCJE). Take eight end-feed button head screws 5/16-18 - 11/16” long
(#KEDB) and eight end-feed T-nuts 5/16-18” (#YREC) out of the bag.
❏Take four gussets brackets (#YKPV) out of the box.
❏Use the button head screws (#KEDB) and T-nut (#YREC) to connect one gusset bracket
(#YKPV) with the 4’ beam (T-nut inside the slot of the T-slotted beam). Do not fully
tighten the fasteners. You may slide the gusset, the screw and T-nut while untighten,
as image shown:
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Series 1780 Dynamometer User Manual V1.1
Document ID: Q2D4F5
Publish date: 2020-03-06
Fig. 4.5: Insert the screw (#KEDB) through the Gusset bracket (#YKPV) and reach the nut (#YREC)
❏Repeat the previous step on the other side of the gusset bracket and connect the 4’
single beam to the 7” beam (#NWGF).
❏Fully connect the 4’ and the 7” beams as shown in Fig 4.6 with the four last fasteners
(#KEDB), do not fully tighten the screws and the T-nuts:
Fig. 4.6: Vertical part of the support
❏Position the structure flat on the working table.
❏Take two diagonal beams 6” long (#QFGJ), with its screws and nuts already assembled
on the beam, and two gussets brackets (#YKPV) out of the box (#BCJE). Then, take four
button head 5/16-18” screws (#KEDB) and end-feed T-nut 5/16-18” (#YREC) out of the
beam fasteners bag (#WVKM).
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