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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
Installation and operating instructions Wilo-EMU TR/TRE 216 ... 326-3
Installation and electrical 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!
ƒ
Full load
Set the motor protection to the rated current according to the rating plate.
ƒ
Partial load operation
Set the motor protection to 5 % above the current measured at the duty point.
ƒ
The motor protection setting depends on the installation:
–
Motor protection in the motor line: Set the motor protection to 0.58 x rated current.
–
Motor protection installed in the mains supply cable: Set the motor protection to the
rated current.
ƒ
The maximum start-up time in the star connection: 3 s
ƒ
Full load
Set the motor protection to the rated current according to the rating plate.
ƒ
Partial load operation
Set the motor protection to 5 % above the current measured at the duty point.
Note the following:
ƒ
Current consumption must always be below the rated current.
ƒ
Complete starting and stopping within 30 s.
ƒ
To avoid power dissipation, bypass the electronic starter (soft start) once normal opera-
tion is reached.
en-US
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Capítulos
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