Service manual

Electrical Service Manual V4.0

1-7

CENTRAL COMMAND I

BRUSH CIRCUIT BREAKERS

All of our machines with Central Command 1 have in line brush motor protection. The pro-

tection is in line auto resetting circuit breaker(s) These breakers will open in the event of an

over load and reset themselves when they cool. These breakers can burn out in the event

of a huge overload and weaken over time if they are tripped repeatedly.

The following is a list of the machines and what circuit breakers are used on each one.

MODEL BREAKER QUANTITY

2000 Cylindrical 22 50 amp 1

2000 Cylindrical 28 30 amp 2

2000 Disc STANDARD 30 amp 2

2000 Disc HEAVY DUTY 40 amp 2

29 Disc – STANDARD 30 amp 2

29/35 Disc – HEAVY DUTY 40 amp 2

35 Cylindrical 30 amp 2

38/40/3700 Disc 40 amp 2

40/3700 Cylindrical 30 amp 2

52 Disc 40 amp 3

SIMPLIFIED TROUBLE SHOOTING

1. Check battery voltage. Batteries voltage must be at least 24 volts or over to begin testing.

2. Load test batteries. – Batteries not tested under load can have undetected bad cells in

them.

3. Check all battery cable connections. – The Curtis system is very sensitive and can shut

down from a loose or corroded battery connection.

4. Check the connections to the traction motor. On early machines we used an Anderson

Connector between the controller and the drive motor. These connectors can fail over time.

5. Are the Relays OK? In order for the Curtis system to operate relays #1 and #2 (On all

units but 2000 this unit had a #2 relay only) must be operating properly for the machine to

move. Sometimes the relays overheat which affects their coil resistance causing the Curtis

controller to shut down. We recommend substituting good relays for the ones in the ma-

chine to see if replacement ﬁxes the problem. You can wire the relay in and not mount it to

the machine to save trouble shooting time. We use only two types of relays on the Curtis

systems. A canister type 80 amp relay and an automotive type 15 amp cube relay.

6. Is the potentiometer OK? The potentiometer creates a varied voltage from approximately

0.2 volts to 4.9 volts and sends it to the Curtis control to tell the controller to move the ma-

chine.

For advanced trouble shooting please see the chapter for the controller you machine is

equipped with.