Conair LDP-5 User Manual page 34

L D P O p e r a t i o n P r o b l e m s
Problem
The vacuum pump does not
start.
The vacuum pump starts, but
labors or runs noisily or rat-
tles; The drive motor draws
too much current (compared
to amperage readings at ini-
tial start-up).
6 - 4 l Tr o u b l e s h o o t i n g
Possible Cause
The pump starter is not supplied
with the correct voltage or is over-
loaded.
The drive motor starter overload
protection is set too low.
One or more fuses at the pump's 3-
phase disconnect switch have blown.
The vacuum pump or the drive
motor is blocked.
Loose connection(s) in the drive
motor terminal box.
Not all legs of the 3-phase supply
are properly connected. The drive
motor is operating on only two phas-
es.
Solution
Check nameplate and assure correct
voltage is supplied. Reset overloads.
Compare the trip level of the drive
motor starter overload protection
with the amperage data on the
nameplate, correct as necessary.
In case of high ambient temperature:
set the trip level of the drive motor
starter overload protection 5 percent
above the nominal drive motor cur-
rent.
Check for cause of blown fuse and
replace fuse(s).
Disconnect and lock out power to
the pump and remove the motor fan
cover. Try to turn the drive motor
and the vacuum pump by hand. If
the unit is still frozen: remove the
drive motor and check the drive
motor and the vacuum pump sepa-
rately. If the vacuum pump is
blocked, repair the vacuum pump
(contact Conair Service). If the
drive motor is frozen, remove and
replace the motor.
Tighten or rework loose connec-
tions.
Check the for proper connection of
the wires in the starter box and in
the fused disconnect switch (if sup-
plied). Continue by checking supply
voltage. Continue further by check-
ing wiring at the motor itself.