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8-6. Precautions Concerning Electronic Control
(1) Polyethylene V-belt overload protection
The rotation of the motor is transferred to the saw blade by a polyethylene V-belt. When an extremely heavy
or abnormal load is applied to the polyethylene V-belt, the overload protection circuit functions to stop the
motor, protecting the V-belt from wear or damage due to slipping.
In such a case, instruct the customer to immediately turn the switch OFF, lift up the handle, and return the saw
blade section (head) to its original position. Then, turn the switch ON, and allow the machine to idle about 20
seconds so that the motor can be cooled by the motor fan. When the saw blade rotation speed returns to
normal, cutting can be resumed.
In addition, the customer should be advised to give particular attention to the following points:
Avoid cutting operations that cause the overload protection circuit to function repeatedly.
[Reason] There is a danger that the polyethylene V-belt and/or motor may be damaged.
Do not restart cutting until the saw blade rotation speed has returned to normal.
[Reason] If cutting is restarted before the rotation speed returns to normal, the overload protection circuit
will function again, even with a light load.
Even if the switch is not turned OFF after the saw blade section has been raised to its original position, the
rotation speed will return to normal. However, it takes longer (4 to 10 seconds) that if the switch is turned
OFF and then turned ON again so that the soft-start circuit functions.
Accordingly, turning the switch OFF and then ON again allows the operator to restart the cutting operation
more quickly and more safely.
(2) Operating the Model C 12FSA near an electric welding machine may cause fluctuations in the rotation speed.
The control circuit in the Model C 12FSA contains a magnetic sensor (a flux change detecting element) and a
triac (which may malfunction because of excessive electrical noise). Accordingly, customers should be
advised not to operate the Model C 12FSA in the immediate vicinity of other machines that generate extremely
strong magnetic fields or excessive electrical noise.
(3) Operate the machine with correct voltage supply
Large voltage drops caused by an unstable power supply may cause the overload protection circuit to
function, or lower the output of the motor and affect efficient cutting. Advise the customer to check the power
supply before operating the machine.
In addition, the customer should be advised to pay particular attention to the following points:
If an extension cord is used, it should be kept as short as possible and within the requirements listed in the
Handling Instructions.
[Reason] An excessively long extension cord causes voltage drop.
Direct current (DC) cannot be used.
[Reason] The built-in controllers will only function with alternating current (AC).
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Содержание C 12FSA
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