Rossi HB - 9 - Troubles: Causes and Countermeasures

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Rossi
TX11 Operating instructions − UTD.164.06-2012.00_DE_EN
Ref. Motor troubles Possible causes Corrective actions
1 Motor does not work Failure on supply mains Check voltage presence on the three phases of supply mains
False connection in the terminal box Check that motor connection corresponds to the schemes foreseen
Brake jam status See «Brake troubles», point 1
Operation of motor thermal probes Wait for winding cooling; if problems remains, see point 4.
Operation of magnetothermic protection on
power line
Check that the required load is not too high or that magnetothermic protection
is underdimensioned.
Trouble on motor winding Consult Rossi (Motor Division)
2 The direction of rotation
is false
False connection in terminal box Check that motor connection corresponds to the schemes foreseen (for three-
phase motors, change 2 phases)
3 The starting torque is
insuffi cient
Y-connection of motor instead of ∆ Check that motor connection corresponds to the schemes foreseen
Voltage or supply frequency outside motor
nameplate data
Check the electrical parameters of supply mains
Excessive voltage fall upline of the motor Check and if necessary increase the cable section
4 Motor overheating
(t
housing
- t
amb
 70°C)
Brake jam status See «Brake troubles», point 1
Nameplate data do not match with the
power line
Consult Rossi (Motor Division)
Y-connection of motor instead of ∆ Check that motor connection corresponds to the schemes foreseen
A supply phase is missing Check the mains and the contacts inside the motor terminal block
Too high or too long lasting overload Reduce the power requirement, install a higher power motor or pre-arrange an
additional cooling device (independent cooling fan)
Excessive starting frequency Reduce the starting frequency or the inertia downline of the motor
Trouble of Electrical disjunctor (single-phase
motors)
Consult Rossi (Motor Division)
Independent cooling fan (if present) is not
working
Check that the independent cooling fan is working, is correctly working, con-
nected and that the direction of rotation is the one foreseen (see arrow on fan
cover)
Obstructed fan cover Free the cooling air passages
Insuffi cient space around the motor Widen the cooling air passages
Insuffi cient air circulation Increase the cooling air recycle
5 The current absorption
is outside the nameplate
value
Brake jam status See «Brake troubles», point 1
Winding failure Consult Rossi (Motor Division)
6 Anomalous noise Damaged bearings Replace the bearings
False alignment between motor shaft-driven
machine
Correct the alignment
Eccentric or not balanced rotating elements Balance the rotating elements and eliminate the eccentricity
With supply from inverter: low quality
wave, excessive cable length, inadequate
protection
Pre-arrange adequate fi lters and protections. Reduce the distance between
motor and inverter (see specifi c manufacturer's documentation)
Ref. Brake troubles Possible causes Corrective actions
1 Brake does not release Direct supply from motor terminal block:
false or missing motor connection to the
line (e.g.: ∆ connection instead of Y)
Check that motor connection corresponds to the schemes foreseen
Direct supply from motor terminal block:
false of missing brake connection (rectifi er)
to the motor terminal block
Check that brake connection corresponds to schemes foreseen
Direct supply from motor terminal block:
mains voltage does not correspond to
motor name plate data
Consult Rossi (Motor Division)
Direct supply from motor terminal block:
motor supply from inverter
Brake supply from separate line
Supply from separate line: false or missing
brake connection (rectifi er) to the separate
line
Check that brake connection corresponds to schemes foreseen
Supply from separate line: supply voltage
does not correspond to the brake name
plate data
Pre-arrange a separate line with adequate voltage
False brake or rectifi er connection Check that brake connection corresponds to schemes foreseen
Too high air-gap Re-adjust the correct value
Brake coil failure Consult Rossi (Motor Division)
2 Brake does not work Too high air-gap Re-adjust the correct value
Worn friction surface Replace the brake disc
3 The braking delay is too
high
Rectifi er contact openings only from a.c.
side
Open rectifi er contacts also on d.c. side
4 Braking torque is not
suitable
Too high air-gap Re-adjust the correct value
False brake adjustment (motor HBF  160M)
Adjust the brake correctly
Insuffi cient spring number Consult Rossi (Motor Division)
5 Anomalous noise Too high air-gap Re-adjust the correct value
Notes:
When consulting Rossi, state:
– all data on gear reducer or gearmotor name plate;
– failure nature and duration;
– when and under what conditions the failure happened;
– during the warranty period, in order not to loose validity, do not disassemble nor tamper the gear reducer or gearmotor without approval by Rossi.
9 - Troubles: causes and corrective actions