2. Switch off the motor and make sure the pump set runs down smoothly to a
standstill.
NOTE
If the discharge line is equipped with a non-return or check valve, the shut-off element
may remain open as long as there is back pressure.
For prolonged shutdown periods:
1. Close the shut-off element in the suction line.
2. Close the auxiliary connections.
If the fluid handled is fed in under vacuum, also supply the shaft seal with barrier
fluid during standstill.
CAUTION
Risk of freezing during prolonged pump shutdown periods
Damage to the pump!
▷
Drain the pump and the cooling/heating chambers (if any) or otherwise protect
them against freezing.
6.2
Operating limits
DANGER
Non-compliance with operating limits for pressure, temperature and speed
Explosion hazard!
Hot or toxic fluid may escape!
▷
Comply with the operating data indicated in the data sheet.
▷
Avoid prolonged operation against a closed shut-off element.
▷
Never operate the pump at temperatures exceeding those specified in the data
sheet or on the name plate unless the written consent of the manufacturer has
been obtained.
6.2.1 Ambient temperature
CAUTION
Operation outside the permissible ambient temperature
Damage to the pump (set)!
▷
Observe the specified limits for permissible ambient temperatures.
Observe the following parameters and values during operation:
Table 10: Permissible ambient temperatures
Permissible ambient temperature
Value
Maximum
40 °C
Minimum
See data sheet.
6.2.2 Switching frequency
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.
6 Commissioning/Start-up/Shutdown
34 of 66
Etanorm
