Using The Auxiliary Contact (Twu 3; Decommissioning/Disposal; Temporary Decommissioning; Decommissioning For Maintenance Work Or Storage - Wilo Sub TWU 3 HS Serie Einbau- Und Betriebsanleitung

English
The following must be checked at regular inter-
vals:
• Operating voltage (permissible deviation +/- 5 %
of the rated voltage)
• Frequency (permissible deviation +/- 2 % of the
rated frequency)
• Current consumption (permissible deviation be-
tween phases is a maximum of 5%)
• Switching frequency (see technical data)
• Minimum water submersion
• Quiet and low-vibration running
• Gate valves in the pressure pipe must be open.
6.6. Using the auxiliary contact (TWU 3-...-HS-ECP)
6.6.1. Installing the auxiliary contact
Fig. 9.: Installation
1 Position of the auxiliary contact
2 Threaded cable connection
The threaded cable connections for the auxiliary
contact are seal as standard. To lead in a cable,
you have to unscrew the cap and drill through or
pierce the seal on the cap's head.
WARNING: Danger of injury to hands!
If the cap is not securely fixed during drilling
or piercing, there is an increased risk of injury.
Fasten the cap so that it is securely held
during the work and cannot slip. For your own
safety, wear protective gloves.
Fig. 10.: Overview of connections
Connection for dual
1
pump operation
Connection for remote
2
operation
To use the unit as a single-pump system, the
auxiliary contact must be set to the value "1
<->" and there must not be a cable connected
to the auxiliary contact.
BEWARE of short-circuits!
An incorrect connection at the auxiliary
contact could cause a short-circuit. This can
lead to destruction of the frequency convert-
er. Connect devices to the auxiliary contact
exactly as shown in the wiring diagram.

7. Decommissioning/disposal

All work must be carried out with the greatest
care.
Proper protective clothing is to be worn.
When carrying out work in wells and/or tanks, the
respective local protection measures must be ob-
44
Connection for switch
3
for Pmax2
DECOMMISSIONING/DISPOSAL
served in all cases. For safety reasons, make sure
a second person is present at all times.
Only auxiliary lifting devices that are in a techni-
cally perfect condition and load-carrying equip-
ment that has been officially approved may be
used for lowering and raising the pump.
RISK of fatal injury due to malfunction!
Load-carrying and lifting devices must be
in a perfect technical condition. Work may
only commence if the lifting device has been
checked and found to be in perfect working
order. If it is not inspected, fatal injuries may
result.

7.1. Temporary decommissioning

For this type of shutdown, the pump remains in-
stalled and is not cut off from the electricity sup-
ply. In the event of temporary decommissioning
the pump must remain completely immersed so
that it is protected from frost and ice. Ensure that
the temperature of the fluid and in the collector
tank does not fall below +3 °C.
The ambient temperature at the installation
site of the frequency converter must always be
between 4 and 40 °C.
This ensures that the pump is always ready for
operation. For extended downtime, a regular
(monthly to quarterly) 5 minute function test
should be carried out.
CAUTION!
Only perform function runs under the proper
operating and usage conditions. Never run
the machine dry! This can result in irreparable
damage!
7.2. Decommissioning for maintenance work or
storage
• Switch off the system and secure it against being
switched on again by unauthorised persons.
• Have a qualified electrician disconnect the pump
from the mains.
• Close the slide valves in the discharge pipeline
after the well cover.
You can then begin disassembly.
DANGER due to poisonous substances!
Pumps that pump liquids hazardous to health
must always be decontaminated before un-
dertaking any other work. Otherwise, there
is a risk of fatal injury! Wear the necessary
physical protection equipment!
BEWARE of burns!
The housing parts can heat up to well above
40 °C. There is a risk of burns! After switch-
ing it off, let the pump cool down to ambient
temperature.
WILO SE 05/2014 Ed.04 DIN A4