MR-Conveyor-Maintenance-Guide.pdf - 第26页
EN - 0034 Rev. F MR Conveyor Maintenance G uide 26 3/12/2024 Phase Considerations For most applications, Quickdraw Systems uses low v oltage, Brushless DC 3 - Phase Motors and Control Cards. Occasionally, a faulty phase …
EN-0034 Rev. F MR Conveyor Maintenance Guide 25
3/12/2024
Setting Conveyor Speeds
Unless otherwise requested, Quickdraw sets all MR Conveyor Speeds at 50 ft./min.
for all MR Conveyor Systems that include Conveyor Control Boxes. Quickdraw does
this to standardize its conveyor performance data. The Motor Cards used on most
applications come with Speed Potentiometers (Speed Pots) that can either be used
or discarded. Most customers choose not to use the Speed Potentiometers, but
rather set speed with Min/Max Speed Pots directly attached to the board.
How To Determine Conveyor Speed
Procedure:
1) Place a piece of non-reflective tape around the Collar Clamp. * This is done to
ensure that the Tachometer is reading only the reflection of the special
reflective tape.
2) Place a small piece of reflective tape onto the other tape.
3) Turn on the conveyor.
4) Measure the rpm with a Handheld Optical Digital Tachometer, such as the
“AMETEK Model 1726 Optical Digital Tachometer”.
How To Convert Linear Distance/Minute to Target RPM
Procedure:
1) Establish the needed conveyor flow rate. * For example: 50 ft/min.
2) Determine the diameter of a Roller. * The diameter of a standard Roller is
0.827”.
3) Use the following formula to determine the target rpm:
Target RPM = Linear Speed (ft/min) / {π*roller diameter (in feet)}
→ Target RPM = 50 ft/min. / π* (0.827”/12”/ft)
→ Target RPM = 50 ft/min. / π* 0.069 ft.
→ Target RPM = 50 ft/min. / 0.217 ft.
→ Target RPM = 231 rpm
Procedure For Conveyors Equipped With Dart 730 BDC Control Cards:
With Speed Pot:
1) Turn the dial on Speed Pot until the tachometer reads target rpm.
2) If unable to achieve target rpm, adjust the white Min and Max dials found on
the Motor Control Card until the target rpm can be achieved within the range of
the Speed Pot.
Without Speed Pot:
1) Adjust the white Min and Max dials found on the Motor Control Card until the
target rpm can be achieved.
EN-0034 Rev. F MR Conveyor Maintenance Guide 26
3/12/2024
Phase Considerations
For most applications, Quickdraw Systems uses low voltage, Brushless DC 3-Phase
Motors and Control Cards. Occasionally, a faulty phase may be the problem.
Signs of a bad phase include but are not limited to:
a) Intermittent Motor Failure.
b) The ability to start the Motor by turning the Collar Clamp or Motor Shaft
after initial powering-up of the Conveyor. After the Motor has been finger
started, the Motor turns on its own, but again may intermittently have a
start up problem.
To remedy this situation, follow the Electrical Troubleshooting guide on the following page.
Make certain to turn the Conveyor on and off multiple times to make sure that the real
cause of the problem is found.
EN-0034 Rev. F MR Conveyor Maintenance Guide 27
3/12/2024
Electrical Troubleshooting
Procedure:
1) Check all electrical connections. Make sure that all plugs are connected properly.
2) Make sure that it is an electrical problem by eliminating the Conveyor as a possible
cause of failure:
a) Measure the current draw (See Page 20).
b) Hand power the Conveyor.
c) Attach the Conveyor to a Motor Cable that is connected to a different,
functioning Motor Control Card. * Use a different Conveyor Control Box if
possible.
d) Measure the current draw.
3) If the Conveyor turns by hand, and operates within an acceptable current draw range
when connected to a different Motor Control Card, the problem lies somewhere in the
original electrical system.
Possible causes include:
a) Electrical connections.
b) The Motor.
c) The Motor Cable.
d) The Power Supply.
4) To check the Motor, plug the electrical system in question into a different Conveyor. If
the new Conveyor operates properly, the Motor on the original Conveyor is probably
the cause and should be replaced.
5) To check the Motor Cable, switch Cables with a Conveyor that is operating properly.
If the problem disappears, check the original Cable for bad electrical connections or
cuts. If the original Cable cannot be repaired, then it must be replaced.
6) Unplug the Conveyor Control Box and check for loose connections or cut wires within
the Control Box. Be careful not to create additional problems by pulling too forcefully
on the wires. If you believe that you have found loose wiring and have taken steps to
reconnect them properly, plug in the Control Box and measure the current draw of
the original system. If the current draw is within the acceptable range, you have fixed
the problem. If not, proceed to step #7.
7) If you still have not found the problem, replace the Motor Card using the Wiring
Diagram on Pages 21 - 24 as a guide.3
8) If this does not eliminate the problem, please call a Quickdraw Systems
representative for support at 1-800-473-8837 or (952) 935-6921.