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Table 10. Troubleshooting (Con’t)DIST. AUTORIZADO®MEX (55) 53 63 23 31QRO (442) 1 95 72 60MTY (81) 83 54 10 18ventas@industrialmagza.comIndication Possible Cause Corrective Action6. Motor does not Low line voltage. Check for rated line voltage ±10%.reach top speed.Overload. See Indication 3.Circuit board faulty.Replace circuit board.7. Unstable speed, in- Wrong calibration wire (s)See Table 6 and Figure 3.adequate regulation, removed.or low torque.Motor faulty.Check motor commutator and brushes.Refer to motor manufacturer’s instructions.Circuit Board Faulty.Replace circuit board.PARTS LIST1. Power Device Kit (SCR’s and power diodes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .674822. Main Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .674693. Reverse Board, RB3 only . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .674704. NEMA Kit (NEMA 3, 3, 12, 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .674745. Run-Stop Switch, RB1 and RB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .674766. Run-Stop Switch, RB3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .674777. Reverse Switch, RB1 and RB2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .674788. Reverse Switch, RB3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .674799. Run Speed Potentiometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6024610.Fuse, ABC15, RB1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6748111. Fuse, KTK20,, RB2 and RB3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6748012. Run Speed Knob . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6024513. SCR’s (two per unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6749214. Power Diodes (three per unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5039524 Doc. No. <strong>19025</strong> • Boston Gear ® Ratiotrol ® DC Motor Speed Control
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