Fig. 10: Circuit diagram: motors with two parallel cables for DOL starting
1 Motor 2 Motor lead
3 Conductor marking 4 Control unit
5 Mains phases PE Earth conductor (green/yellow)
DANGER
Earth conductor not properly connected
Danger of death from electric shock!
▷ Never operate the motor without earth conductor.
▷ The earth conductor must be connected by a professional electrician only.
5.7.1 Recommended monitoring and protective equipment
The following monitoring and protective equipment is recommended to ensure
proper operation of the pump set:
Table 13: Monitoring options
To be monitored If there is any risk of: Monitoring options, e.g.:
Dry running ▪ Highly fluctuating water levels
▪ Wells with temporary low yields
▪ Semi-automatic or fully
automatic dry running
protection equipment
(e.g. integrated in KSB's
control unit UPA Control)
Lightning/overvoltage Although a lightning protection device cannot offer
protection against direct lightning strikes, it will
protect the pump unit from atmospheric overvoltage
and any lightning strikes nearby.
▪ Lightning protection
with earthing terminal
(available from KSB)
Phase failure ▪ Failure of one phase resulting in overloading of
the remaining two phases
Excessive temperature in the
motor
▪ Permissible motor temperature exceeded by
system conditions, e.g.:
–
Deposits on the stator
– Installation in standing water
– Dirt/sand deposits in the stator area
– Major temperature rise in the fluid handled
– Frequency controlled motors
▪ Pt 100 temperature
sensor and the
corresponding analysing
device
5 Installation at Site
36 of 64
UPA, UPZ, BSX
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