Installation and operating instructions Wilo-Rexa FIT
41
COMMISSIONING
English
Electrical connections may only be made by
a qualified electrician!
The wires of the connection cable are assigned as
follows:
6-wire connection cable
Wire number
Terminal
1
Temperature monitoring
2
Temperature monitoring
3
U
4
V
5
W
green/yellow (gn-ye) Earth (PE)
5.5.5. Connecting the monitoring devices
All monitoring devices must be connected at all
times!
Temperature monitoring of the single-phase AC
motor
•
The temperature monitoring unit is integrat
-
ed in the single-phase AC motor and switches
automatically. The monitoring function is always
active and does not need to be connected sepa-
rately.
Temperature monitoring of the three-phase AC
motor
• Bimetallic strips can be connected directly to the
switchgear.
Connection values: max. 250 V(AC), 2.5 A,
cos φ = 1
• When the threshold is reached, the unit must
switch off.
For this reason, no warranty claims can be accept
-
ed for any damage to the winding resulting from
unsuitable motor monitoring!
Connecting the pencil electrode (available as an
option) for sealing chamber control
•
The pencil electrode must be connected via an
evaluation relay. We recommend the “NIV 101/A”
relay for this.
•
The threshold is 30 kOhm. When the threshold
is reached, a warning must be given or the unit
switched off.
CAUTION!
If there is only a warning, the pump could be
irreparably damaged by water ingress. We
always recommend switching the pump off!
5.6. Motor protection and activation types
5.6.1. Motor protection
The minimum requirement for motors with a free
cable end is a thermal relay/motor protection
switch with temperature compensation, differ-
ential triggering and an anti-reactivation device
in accordance with VDE 0660 or the appropriate
national regulations.
If the pump is connected to electrical systems
in which faults frequently occur, we recommend
installing additional protective devices provided
by the customer (overvoltage, undervoltage or
phase failure relays, lightning protection etc.). We
also recommend installing a residual-current-op
-
erated protection switch.
Local and national regulations must be observed
when connecting the pump.
5.6.2. Activation types
Direct activation
At full load, the motor protection should be set
to the rated current shown on the rating plate. At
partial load, we recommend that the motor pro-
tection be set 5 % above the current measured at
the duty point.
Soft start activation
• At full load, the motor protection should be set
to the rated current at the duty point. At partial
load, we recommend that the motor protection
be set 5 % above the current measured at the
duty point.
•
The current consumption must be below the rat
-
ed current throughout the entire operation.
• Due to the upstream motor protection, starting or
stopping should be completed within 30 seconds.
•
To avoid power dissipation during operation,
bypass the electronic starter (soft start) once
normal operation is reached.
Pumps with a plug
At full load, the motor protection should be set
to the rated current shown on the rating plate. At
partial load, we recommend that the motor pro-
tection be set 5 % above the current measured at
the duty point.
Plugs are not overflow-proof. Observe the
information on the protection class (IP).
The socket be installed so it is overflow-proof.
5.6.3. Operation with frequency converters
Operation of the pump on a frequency converter
is
not
possible.
6. Commissioning
The “Commissioning” section contains all the im
-
portant instructions for the operating personnel
for starting up and operating the pump.
The following conditions must be adhered to and
monitored:
•
Type of installation
•
Operating mode
•
Minimum water submersion/max. immersion
depth
These general conditions must also be checked
after a lengthy period without operation, and
any defects detected must be repaired!