Pine Research MSR 636A, User Manual, Page: 128 / 176

122
Problem Suggested Cause or Action
Continuous
Rotation at a
High Rate Check the motor control cable which connects the
control unit to the motor unit. The connectors at both
ends of this cable must be secured using the two screws
on each connector.
Faulty connection or wire – contact the factory.
Faulty circuitry – contact the factory.
System Power Loss The main power switch on the back panel is a circuit
breaker which may trip and cause the system to lose
power. To reset the breaker, turn the switch off and then
turn the switch on again. Repeated tripping may indicate
a more serious problem.
Front Panel Circuit
Breaker Trips This breaker only trips if the current passing through the
motor windings is high enough to potentially damage the
motor. This could occur if the electrode is spinning in a
particularly viscous liquid, if the shaft is rubbing against
something, or if an applied periodic waveform controlling
the rotation rate has too great an amplitude or
frequency.
This breaker (thermal type) is sized to limit the average
motor current to within the motor specification. Running
the motor at a high modulation frequency, or with large
amplitude changes, or a combination of the two, may
cause tripping. It may be necessary to reduce the
modulation frequency and/or amplitude to prevent
tripping of the breaker.
Rotator
Spins
Backwards When the rotation rate knob is in the full counterclockwise
position, it is natural to expect that the rotation rate should
be exactly zero. However, it is normal for there to be a
small residual rotation rate, and often this is in the reverse
direction.
If a negative voltage signal is applied to the INPUT jacks
on the front panel of the control unit, then the rotator will
spin backwards. If this is undesirable, reverse the polarity
of the signal applied to the INPUT jacks.