PLDC01938
REVISION 00
01/06/2011
TECHNICAL DEPT.
Stavale
- date 05/09/2011
22/195
A2.1 Checking brush head actuator current draw
When checking the draw of the electric motors, it is important for the batteries to be charged. If
the battery voltage (V) is not 36 V (in the case of the CT 230) the draw in amps (A) will be
misleading.
The power in watts (W) of an electric motor (DC) is the product of A x V = W. If the volts (V) are
lower, to obtain the same power the amps must be increased, falsifying the reference value.
The batteries must therefore be charged.
Example: if with the batteries charged to 36 V the motor draws 10 A and the power draw of the
motor is 360 W to perform a given task, then if the voltage drops to 31 V, while the power draw
remains at 360 W, the current draw of the motor (A) must increase to 11.6 A.
Head actuator current draw can be tested in two ways. The person responsible for the
measurement can decide whether to measure the current draw on the fuse wires (quicker, but
the tanks must be emptied) or using the wires connected to the control panel board, longer as
the control panel must be dismounted, but the two tanks need not be emptied.
Checking current draw on the fuse wires
1
Make sure the batteries on the machine are charged (36 V ± 1 V).
2
Obtain a clamp meter able to read up to 200 A (amps), see photograph below.
3
Move the machine to the tank draining area and completely empty both tanks.
4
Move the machine onto a flat dry area of floor.
5
Turn the machine off and put the parking brake on.
6
Test with the brushes mounted (preferably new).
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PHOTO 47
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