barrier liquid during standstill.
Only turn off the cooling liquid supply after the pump has cooled down.
3.
Drain the pump. (⇨ Section 7.3 Page 50)
6.2 Operating limits
DANGER
Non-compliance with application 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 valve.
▷ 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 15: Permissible ambient temperatures
Permissible ambient temperature Value
Maximum 40 °C
Minimum See data sheet.
6.2.2 Frequency of starts
DANGER
Excessive surface temperature of the motor
Explosion hazard!
Damage to the motor!
▷ In case of explosion-proof motors, observe the switching frequency specified in
the manufacturer's product literature.
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 (d.o.l., star-delta, moments of inertia,
etc). If the start-ups are evenly spaced over the period indicated, the following limits
can be used for orientation for start-up with the discharge-side gate valve slightly
open:
Table 16: Frequency of starts
Motor rating
[kW]
Maximum No. of start-ups
[Start-ups/hour]
up to 12 15
up to 100 10
more than 100 5
6 Commissioning/Start-up/Shutdown
KWP
43 of 78
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