Troubleshooting
WARNING
Risk of electrical shock, risk of damage to equipment.
Electrical installation work must only be executed by qualified personnel that knows and observes the following regulations:
- IEC 364 or CENELEC HD 384 or DIN VDE 0100, respectively,
- IEC-Report 664 or DIN VDE 0110,
- BGV A2 (VBG 4) or equivalent national accident prevention regulation.
CAUTION
During operation the surface of the vacuum pump may reach temperatures of more than 70 °C.
Risk of burns!
Let the vacuum pump cool down prior to a required contact or wear heat protection gloves.
Problem
Possible Cause
Remedy
The vacuum pump does not reach the usual
pressure
The vacuum system or suction line is not
leak-tight
Check the hose or pipe connections for possible
leak
Partial clogging in the suction, discharge or
pressure line
Remove the clogging
Long suction, discharge or pressure line with
too small diameter
Use larger diameter
Internal parts worn or damaged
Repair the vacuum pump (Busch service)
The vacuum pump does not start
The drive motor is not supplied with the correct
voltage or is overloaded
Supply the drive motor with the correct voltage
The drive motor starter overload protection is
too small or trip level is too low
Compare the trip level of the drive motor starter
overload protection with the data on the name-
plate
Correct if necessary
In case of high ambient temperature:
Set the trip level of the drive motor starter
overload protection 5 percent above the no-
minal drive motor current
The connection cable is too small or too long
causing a voltage drop at the vacuum pump
Use sufficiently dimensioned cable
The drive motor is defective
Replace the drive motor (Busch service)
The vacuum pump is blocked
Solid foreign matter has entered the vacuum
pump
Repair the vacuum pump (Busch service)
Make sure the suction line is equipped with a
mesh screen
If necessary additionally provide a filter
Corrosion in the vacuum pump from remaining
condensate
Repair the vacuum pump (Busch service)
Check the process
Observe the chapter “Installation and Commis-
sioning, Operating Notes”
The vacuum pump was run in the wrong
direction
Repair the vacuum pump (Busch service)
When connecting the vacuum pump make sure
the vacuum pump will run in the correct direc-
tion (see “Installation”)
Condensate ran into the vacuum pump
Repair the vacuum pump (Busch service)
Make sure no condensate will enter the vacuum
pump, if necessary provide a drip leg and a
drain cock
Drain condensate regularly
DP 80-2000 C-T
Troubleshooting
0870564647 (En)
Page 17
Summary of Contents for COBRA NS 0070-0160 C
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