English
24
WILO SE 09/2012
6 Description and function
6.1
Switchbox description
SK 602N
Includes the contactor for full motor protection tripping, the
On/Off switch, with integrated run signal light (Fig. 1, item 1),
terminals for external potential-free activation/deactivation
and terminal rail (Fig. 5).
SK 622N
Like SK 602N, but additionally with potential-free contacts for
external run signal (SBM) and fault signal (SSM), see Fig. 6, as
well as fault signal lights (Fig. 2, item 2).
Motor protection
The selection of the correct motor protection is a decisive fac-
tor for the service life and operational reliability of a circulation
pump. Motor protection switches are no longer suitable for
multi-speed pumps, since their motors have deviating rated
currents in the different stages, which require different fuses.
Motor fuse protection in Wilo pumps can be ensured by taking
the following measures:
• Blocking current-proof motors: No motor protection
required.
The pump motors are designed in such a way that current flow-
ing through the winding cannot cause any damage in the event
of overloading or blocking. This applies both to single-phase
and three-phase versions, depending on the rated motor
power.
•
Pumps with full motor protection and Wilo-SK 602/622N
tripping unit or Wilo switchgear/control device
Implementation of full motor protection by means of thermal
winding contacts (WSK) within the motor winding. This applies
both to single-phase and three-phase versions, depending on
the rated motor power.
Содержание SK 602N
Страница 2: ...Fig 1 Fig 2 Fig 3a Fig 3b 1 2 1 4 4 130 103 110 130 113 113 6 6 4 4 130 103 115 130 113 113 6 6...
Страница 3: ...Fig 4 a b c Fig 5...
Страница 4: ...Fig 6...
