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#1
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Using 9 motors on the robot
We need to connect 9 motors this year
and as you know there are only 8 40A outputs on the POWER DISTRIBUTION BOARD. we wanted to know wether we can connect one victor to a 30A output. We want to know if it will work and if it is legal. if we cannot do this we would love to get a suggestion how to connect the 9th motor. Thank you. |
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#2
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Re: Using 9 motors on the robot
Look at the power requirements for the motors. Only the CIMS and the Fisher-Price motors require 40 Amp breakers; the rest can use the 30 Amp connections.
Good luck! |
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#3
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Re: Using 9 motors on the robot
Thank you for the quick answer!
We realy appreciate it. Good luck to you too, and thank you once again. |
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#4
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Re: Using 9 motors on the robot
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#5
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Re: Using 9 motors on the robot
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For example, a fisher price motor can draw more then 40 amps at stall, but it will also burn itself up at stall. It may be wise to use a smaller breaker. Last edited by Joe Ross : 17-02-2010 at 12:11. |
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#6
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Re: Using 9 motors on the robot
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Re: Using 9 motors on the robot
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#8
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Re: Using 9 motors on the robot
Don't forget <R52> that says you can have a max of 5 CIM motors:
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#9
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Re: Using 9 motors on the robot
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#10
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Re: Using 9 motors on the robot
The depends on how the motors are used. We have 8 motors on our robot this year (9 if you include the servo
)4 for driving, just like every other year 1 for a "ball magnet" like other teams have discussed and shown here, rolling continuously. 2 for a kicker - each one only needs to complete 1 full revolution out of the gear box per kick. 1 for a lifter which will only be used for 5-10 seconds at the end of the match. So, a lot of motors to do a lot of different things... but overall not any more battery intensive than any other year. |
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#11
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Re: Using 9 motors on the robot
Everyone,
The electrical rules are written to coordinate breaker size to wire size only. The breakers are sized to protect the wiring and nothing else. If you put #18 wire with a 40 amp breaker and something shorts, then the wire will set itself on fire. 40 amp breakers get #12 or larger, 30 amp breakers get #14 or larger and 20 amp breakers get #18 or larger. You can run a 20 amp breaker for a CIM motor if you so choose. Both the Jaguar and Victor can handle currents in excess of the stall current of the CIM motors. The circuit breakers used on FRC robots have trip characteristics that allow currents in excess of 600% of the trip point for a few seconds. Yes, that is 240 amps for a 40 amp breaker. Although the rules allow it, I can't see any reason why you would want to run any motor except the CIM or Fisher Price motors with a 40 amp breaker. For a maximum motor count of 5 CIM and 2 FP, that is only 7 40 amp breakers. |
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