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Installation and electrical connection
26
WILO SE 2019-01
With PTC sensor
Connect the PTC sensor via an evaluation relay. Relay “CM-MSS” is recommended for
this. The threshold has been preset.
PTC sensor wiring diagram
Temperature limiter
10, 11
PTC sensor connection
Temperature controller and limiter
11
High temperature connection
10
Centre terminal
12
Low temperature connection
Triggering status for temperature controller and limiter
Depending on the version of the thermal motor monitoring, the following triggering
status must occur when the threshold value is reached:
ƒ
Temperature limiter (1 temperature circuit):
The system must be deactivated when the threshold is reached.
ƒ
Temperature controller and limiter (2 temperature circuits):
When the threshold for the low temperature is reached, the motor can deactivate
with automatic reactivation. When the threshold for the high temperature limit is
reached, the motor must deactivate with manual reactivation.
Note the additional information in the section on potentially explosive areas in the
appendix!
6.5.4.3
Pre-chamber monitoring (external
electrode)
Connect the external electrode via an evaluation relay. Relay “NIV 101/A” is recommen-
ded 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
appendix!
6.5.5
Motor protection adjustment
Motor protection must be set depending on the selected activation type.
6.5.5.1
Direct activation
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 5 % above the cur-
rent measured at the duty point.
6.5.5.2
Star-delta activation
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 mains supply cable: Set the motor protection to the
rated current.
The maximum start-up time in star connection is 3 seconds.
6.5.5.3
Soft starter
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 5 % above the cur-
rent measured at the duty point. The following points must also be observed:
ƒ
Power 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 op-
eration is reached.
6.5.6
Operation with frequency con-
verter
Operation on the frequency converter is permitted. Refer to the appendix for the relev-
ant requirements!
