14
Troubleshooting
NOTE: If any of the above mentioned attempts to correct the problem have been
performed and the problem persists, contact VDG (Van der Graaf):
Technical Support: 1 (866) 595-3292 Email: service@vandergraaf.com
The unit will not run 1. Check for correct connections.
2. Check for correct power supply voltage.
3. In a 3 O
/
unit check for equal voltage in
all 3 phases.
The unit runs hot 1. Make sure the unit is running with a belt. If the
application does not require a belt be sure the
motor is No Belt (NB) series.
2. Load not to exceed the capacity of the unit.
3. Check the current draw and make sure it is not
higher than the rated current on the name plate.
The unit will hum, 1. On 1 O
/
units, check the capacitor and
start but very slowly starting switch.
or not start at all 2. On 3 O
/
units, check for equal voltage on
all 3 legs or open phase in the winding.
The unit will trip off 1. Check the Drum Motor for a short to ground.
overload or fuses 2. If no short to ground is present, apply the rated
input voltage and with an ammeter, measure the
current and ensure that there is a balance of
+/-10% variance between all three phases.
The unit is noisy 1. Check the installation of the unit.
2. Make sure that the arrow on the shaft, opposite
to the junction box, is pointing up.
3. Check for excess belt tension and relieve.
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