BUSCH COBRA NS 0070-0600 C, Instruction Manual

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11 | Troubleshooting
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11 Troubleshooting
DANGER
Live wires.
Risk of electrical shock.
• Electrical installation work must only be executed by qualified personnel.
CAUTION
Hot surface.
Risk of burns!
• Prior to any action requiring touching the machine, let the machine cool down first.
Problem Possible Cause Remedy
The machine does not start. The motor is not supplied
with the correct voltage.
• Check the power supply.
The rotors are jammed or
seized. • Turn the screw rotors
manually from the rotor
access plug (PMR).
• Repair the machine (con-
tact Busch).
Solid foreign matter has
entered the machine. • Remove the solid foreign
matter or repair the ma-
chine (contact Busch).
• Install an inlet filter if ne-
cessary.
A temperature sensor has
reached the switch point. • Let the machine cool
down.
• See problem “The ma-
chine runs too hot”.
Corrosion in the machine
from remaining condensate. • Repair the machine.
• Check the process and
follow the recommenda-
tion in case of
Conveying
Condensable Vapours
[
► 25] .
The motor is defective. • Replace the motor.
The machine does not reach
the usual pressure on the
suction connection. Suction or discharge lines
too long or section diameter
too small. • Use larger diameter or
shorter lines.
• Seek advice from your
local Busch representa-
tive.
Process deposits on the
pumping components • Flush the machine.
The machine runs in the
wrong direction. • Check the direction of ro-
tation, see Wiring Dia-
gram Three-Phase Motor.
Internal parts are worn or
damaged. • Repair the machine (con-
tact Busch).