Motor Protection - salmson SCX-DCX Instalacion Y Puesta En Servicio

English
• To ensure protection against dripping water and to provide the cable sheath
with strain relief, (PG 13.5), a connection cable with an outside diameter of 10 -
12 mm should be used, and fitted as shown in Fig. 4. In addition, the cable near
the threaded cable gland should be bent into the form of a drip loop, to from
which any accumulated drips will fall. Unused cable glands should be blanked
off with the sealing plates provided, and screwed up tight.
• Commission pumps only if they are fitted with the correct modular cover. Check
that the cover gasket is correctly seated.
• Earth the pump/system according to regulations.
7.2.1 Collective fault signal (SSM)
DANGER! Danger of death!
Improper electrical connections pose a risk of fatal injury due to electric
shock.
If the mains leads and SSM lead are brought together in a 5-core cable, the
SSM-lead must not be monitored using a protective low voltage.
For pumps with terminal boxes of types Fig. 4c and 4d a collective fault signal
"SSM" for connection to the building automation system is available as a poten-
tial-free NC relay (max. contact loading 250 VAC/1A).

7.2.2 Motor protection

CAUTION! Risk of damage!
If the protection contact (Fig. 4c et 4d) of the pump is not connected to
a motor protection system, the motor can be damaged due to thermal over-
load!
The terminals 10 and 15 (potential-free NC contact, 250 V~, 1 A max) can be
connected to an external switching-off motor protection.
Pump with
terminal box type
4a and 4b
4c and 4d
• The setting of any thermal tripping that is fitted must correspond to the maxi-
mum current (see name plate) of the speed step at which the pump is being
operated.
Motor protection triping devices
If Salmson tripping units MGP are present in existing systems, pumps with full
motor protection can be connected to them. Perform the mains connection and
40
Tripping
Internal switching off of motor
voltage
Tripping the SSM (opening of
the potential-free contact
between terminals 10 and 15)
Fault acknowledgement
Automatically, after the motor
has cooled down
• Switch off mains voltage
• Allow motor to cool down
• Switch on mains voltage
Salmson 02/2012