15
Faults and Alarms
15-2 | CFW700
15.2 MOTOR OVERTEMPERATURE PROTECTION
ATTENTION!
The PTC must have a reinforced insulation against the live parts of the motor and of the installation.
This protection performs the motor overtemperature protection by means of the alarm (A110) and the fault (F078)
indication.
The motor must have a PTC type temperature sensor. An analog output supplies constant current for the PTC
(2 mA), while an inverter analog input reads the voltage across the PTC and compares it with the limit values for
fault and alarm. Refer to the
. When those values are exceeded, the alarm or fault indication occurs.
The analog outputs AO1 and AO2 of the control module can be used to supply the constant current for the PTC.
Therefore it is necessary to configure the DIP switches of the output for current and to set the output function
parameter for 11=PTC.
The analog inputs AI1 and AI2 of the control module can be used to read the PTC voltage. Therefore it is necessary
to configure the input DIP switch for voltage and to set the input function parameter for 4=PTC. Refer to the
parameter P0351 on the
NOTE!
In order that this function works properly, it is important to keep gains and offset of the analog input
and output in the default values.
Table 15.1:
A110 and F078 trip levels
Action
PTC
AI Voltage
A110 occurs during the temperature increase
R
PTC
>3.51 kΩ
V
AI
>7.0 V
F078 trips during the temperature increase
R
PTC
>3.9 kΩ
V
AI
>7.8 V
Resets A110 alarm
150 Ω < R
PTC
<1.6 kΩ
0.3<V
AI
<3.2 V
Allows the reset of the F078 fault
150 Ω < R
PTC
<1.6 kΩ
0.3<V
AI
<3.2 V
F078 trips (minimum resistance detection)
R
PTC
<60 Ω
<0.12 V
Summary of Contents for CFW700
Page 2: ......
Page 4: ......
Page 8: ...Summary...
Page 34: ...2 General Information 2 4 CFW700...
Page 38: ...3 About the CFW700 3 4 CFW700...
Page 56: ...7 Starting up and Settings 7 4 CFW700...
Page 58: ...8 Available Control Types 8 2 CFW700...
Page 78: ...10 VVW Control 10 8 CFW700...
Page 158: ...13 Digital and Analog Inputs and Outputs 13 28 CFW700...
