User manual

TROUBLESHOOTING GUIDE
Amplifier NORMAL light does not come on.
1. Check that at least between 24V and 150V DC is available at the amp’s
DC power input. Increase or decrease supply if outside these limits.
2. Check that the enable signal is low ( active ).
Amplifier FAULT light is always on.
1. Check for high temperature caused by failure of cooling fan or loss of
220V AC supply to cooling fan.
2. Check for possible short from motor wires to ground, or across motor
wires.
NORMAL light goes off while accelerating.
1. Check for power supply dipping below 24V while motor accelerates. If
this is happening, either increase supply voltage, increase filter capacitor
or slow down the acceleration by adding a resistor in series and a capacitor
to ground on the reference signal.
2. This problem can also be caused by noise on the input signal, or if the
input reference is being switched by relays, etc. Check that the amplifier is
properly earthed, and if necessary install an RC filter as described above.
NORMAL light goes off while decelerating.
1. Check for power supply going above 160V while motor accelerates. If this
is happening, either reduce supply voltage, install a regenerative brake or
slow down the deceleration by adding a resistor in series and a capacitor to
ground on the reference signal.
2. This problem can also be caused by noise on the input signal, or if the
input reference is being switched by relays, etc. Check that the amplifier is
properly earthed, and if necessary install an RC filter as described above.
NORMAL light is on but motor does not run.
1. Check for proper input signal at the reference input.
2. Check for any break in motor wires.
NORMAL light is on but motor speed is uncontrolled.
1. Check for break in tach wires to the amplifier.
Oscillation or other instability in motor operation.
1. Check that amplifier is properly earthed.
2. Check for noise pickup on the input or tach signals. Try using RC filters or
shielding these connections.
3. Check tuning of amplifier. Refer to procedures described earlier.