BUSCH COBRA NC 1500 B, 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. • 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.
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.
If an inlet screen or an inlet
filter is installed, it can be
partially clogged. • Clean the inlet screen or
replace the inlet filter
cartridge.
The machine runs in the
wrong direction. • Check the direction of ro-
tation, see Wiring Dia-
gram Three-Phase Motor
(Pump Drive) [
► 16] .
Internal parts are worn or
damaged. • Repair the machine (con-
tact Busch).
The machine runs very nois-
ily. Wrong oil quantity or un-
suitable oil type. • Use one of the recom-
mended oils in the correct
quantity, see
Oil [ ► 30]
.
Defective gears, bearings or
coupling element. • Repair machine (contact
Busch).