Wilo EMU TR 212 Instrucciones De Instalación Y Funcionamiento página 28

en-US
6.5.4.3 Pre-chamber monitoring (external
electrode)
6.5.5 Adjustment of the motor protec-
tion
6.5.5.1 Direct start-up
6.5.5.2 Star-delta activation
6.5.5.3 Soft starter
28
Installation and electrical connection
Wiring diagram for bimetallic strip
20 Center terminal
22 Low temperature connection
With PTC sensor
Connect the PTC sensor via an evaluation relay. The "CM-MSS" relay is recommended for
this purpose.
PTC sensor wiring diagram
Temperature limiter
10, 11 PTC sensor connection
Temperature controller and limiter
11 High temperature connection
10 Center terminal
12 Low temperature connection
Trigger status for temperature controller and limiter
The installed sensor specifies the trigger temperature as part of thermal motor monitoring
using bimetallic strips or PTC sensors. Depending on the thermal motor monitoring version,
the following triggering status must occur when the trigger temperature is reached:
ƒ
Temperature limiter (1 temperature circuit):
The unit must be deactivated once the trigger temperature has been reached.
ƒ
Temperature controller and limiter (2 temperature circuits):
Once the trigger temperature for the low temperature is reached, the motor can deacti-
vate with automatic reactivation. Upon reaching the trigger temperature for the high
temperature limit, the motor must deactivate with manual reactivation.
Note the additional information in the section on potentially explosive areas described in
the appendix!
Connect the external electrode via an evaluation relay. Relay "NIV 101/A" is recommended
for this. The threshold is 30 kOhm.
Once the threshold is reached, a warning must be output or the unit must be switched
off.
Note the additional information in the section on potentially explosive areas in the ap-
pendix!
The motor protection must be set depending on the selected activation type.
At full load, set the motor protection switch to the rated current (see rating plate). At partial
load, it is recommended to set the motor protection switch to 5 % above the measured cur-
rent in the duty point.
The motor protection setting depends on the installation:
ƒ
Motor protection installed in the motor line: Set the motor protection to 0.58 x the rated
current.
ƒ
Motor protection installed in the power supply cable: Set the motor protection to the
rated current.
The maximum start-up time in star connection is 3 seconds.
At full load, set the motor protection switch to the rated current (see rating plate). At partial
load, it is recommended to set the motor protection switch to 5 % above the measured cur-
rent in the duty point. Furthermore, observe the following points:
ƒ
Current consumption must always be lower than the rated current.
ƒ
Complete starting and stopping within 30 s.
WILO SE 2021-05