KSB Etaprime L, Инструкция по установке и эксплуатации

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6 Commissioning/Start-up/Shutdown
39 of 76
Etaprime L
Table 11: 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 frequency of starts 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 (DOL, star-delta, moments of inertia,
etc). If the starts are evenly spaced over the period indicated, the following limits
serve as orientation for start-up with the discharge-side gate valve slightly open:
Table 12: Frequency of starts
Shaft unit 4) Maximum frequency of starts
Impeller material G
(EN-GJL-250/A48CL35B)
Impeller material C
(1.4408/A743 GR CF8M)
[Starts/hour] [Starts/hour]
17 6 6
25 12 6
35 12 6
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
Table 13: Flow rate
Minimum flow rate Maximum flow rate
≈ 15 % of Q
opt.
5)
See hydraulic characteristic curves
The calculation formula below can be used to check if an additional heat build-up
could lead to a dangerous temperature increase at the pump surface.
×
×
×
4)
Shaft unit see data sheet.
5)
Duty point at maximum efficiency