6.2.3 Frequency of starts
DANGER
Excessive surface temperature of the motor
Explosion hazard!
Damage to the motor!
▷ In case of explosion-proof motors, observe the frequency of starts specified in
the manufacturer's product literature.
CAUTION
Re-starting while motor is still running down
Damage to the pump (set)!
▷ Do not re-start the pump set before the pump rotor has come to a standstill.
The frequency of starts is usually determined by the maximum temperature increase
of the motor. This largely depends on the power reserves of the motor in steady-
state operation and on the starting conditions (DOL, star-delta, moments of inertia,
etc).
Observe the motor manufacturer's operating instructions.
6.2.4 Fluid handled
6.2.4.1 Temperature of the fluid handled
CAUTION
Fluid temperature too high or too low
Damage to the pump!
▷ Never operate the pump set against a closed shut-off element.
▷ Never operate the pump at temperatures above or below those specified in the
data sheet or on the name plate unless the written consent of the manufacturer
has been obtained.
If the values are not indicated in the data sheet, the following temperature limits
apply. The temperatures must neither be below nor above these limits.
Table 13: Temperature limits of the fluid handled
Minimum fluid temperature 0 °C
Maximum fluid temperature + 80 °C
6.2.4.2 Abrasive fluids/solids
CAUTION
Abrasive particles or solids in the fluid
Damage to the pump!
▷ Comply with the limits indicated in the data sheet.
▷ Flush the piping prior to commissioning.
▷ Install a filter in the system, if required.
Do not exceed the maximum permissible solids content specified in the data sheet.
When the pump handles fluids containing abrasive substances, increased wear of the
hydraulic system and shaft seal are to be expected. In this case, reduce the commonly
recommended inspection intervals.
6 Commissioning/Start-up/Shutdown
Omega / Omega V
45 of 94
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