KSB ILN, Operating Manual

Page: 39 / 92

6 Commissioning/Start-up/Shutdown
39 of 92
ILN / ILNC / ILNR
5211.8/08-EN
Table 10: Permissible ambient temperatures
Permissible ambient temperature Value
Maximum 40 °C
Minimum See data sheet.
6.2.2 Frequency of starts
The frequency of starts is usually determined by the maximum temperature increase
of the motor. It largely depends on the power reserves of the motor in steady-state
operation and on the starting conditions (DOL starting, star-delta starting, moments
of inertia, etc). The following number of starts per hour must not be exceeded:
Table 11: Frequency of starts
Motor rating Maximum frequency of starts
[kW] [Starts/hour]
≤ 3 20
4 - 11 15
12 - 45 10
> 45 5
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.
6.2.3 Fluid handled
6.2.3.1 Flow rate
DANGER
Actual flow rate below minimum flow rate
Explosion hazard!
▷ Never let the flow rate drop below the minimum flow rate as per the operating
curve.
▷ Never operate the pump at zero flow.
Minimum flow rate required for the pump
The minimum flow rate for the pump indicated in the data sheets must be observed.
If necessary, provide protective equipment preventing pump operation without the
fluid to be handled or automatically ensuring the minimum flow rate.
The below calculation formula determines the minimum flow rate for fluids whose
physical properties differ from water:
Maximum permissible flow rate for the pump
Unless specified otherwise in the characteristic curves or in the data sheets, the
following applies:
Q
max
= 1.1 × Q
opt