English
36
WILO SE 11/2013
• Double pumps: provide a separate mains connection cable and a separate fuse
on the mains side for both motors of the double pump.
• The pumps can also be used without restriction in existing installations with and
without residual-current-operated protection switch switches. When dimen-
sioning the residual-current-operated protection switch, consider the number
of pumps connected and their motor currents.
• When pumps are used in systems with water temperatures above 90 °C, a suit-
able heat-resistant supply cable must be used.
• All connection cables must be installed so that they do not touch the pipe
and/or the pumps or motor housing.
• To ensure protection against dripping water and to provide the threaded cable
connection 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. 5. In addition,
the cable near the screwed connection should be bent into the form of a drip
loop, from which any accumulated drips will fall. Unused threaded cable con-
nections should be blanked off with the sealing plates provided, and screwed
tight.
• Commission pumps only if they are fitted with the correct modular cover. Check
that the cover seal is correctly seated.
• Earth the pump/installation in accordance with the regulations.
7.2.1 Collective fault signal (SSM)
DANGER! Risk of fatal injury!
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 5 and 7 (fig. 4) 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). The contacts open if the
integral motor protection trips to disconnect the motor. After a manual reset
(fig. 4, item 4) at the pump, the contacts close again and the fault signal is
acknowledged.
7.2.2 Motor protection
CAUTION! Risk of damage to property!
If the thermal winding contact (WSK) of the pump is not connected to
a motor protection system, the motor can be damaged due to thermal
overload!
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