42
2.3.2 THERMAL PROTECTION
2.3.2.1 MOTOR THERMAL PROTECTION
.
Parameters P70 (thermal current as a % of the rated motor current), P71 (motor thermal constant in
seconds) and the current delivered by the drive are used to calculate the presumed operating
temperature of the motor considering an ambient temperature equal to the permitted maximum; the
losses are evaluated with the square of the absorbed current and filtered with the motor thermal
constant. When this value exceeds the maximum thermal current set in P70 (value proportional to the
square of this current) the thermal protection cuts in, enabling logic output o.L.1 and alarm A06. The
action taken may be programmed via connection C32 and by enabling alarm A06:
If A06 is disabled, no action will be taken.
If A06 is enabled, action will depend on C32:
• C32 = 0 (default value) the thermal alarm will cut in and reduce the current limit to match
the motor thermal current.
• C32 = 1 the thermal alarm cuts in and stops the drive immediately.
Name Description Min Max Default UM Scale
MOT_THERM_PRB_SEL
C46 - Enable motor thermal
probe management
(PTC/NTC)
Range
1 1
0 No
1 PTC
2 NTC
3 I23
4 KTY84-130
MOT_TEMP_MAX
P91 - Maximum motor
temperature (if read with
PT100)
0.0 150.0 130 °C 10
DRV_THERM_PRB_SEL
C57 - Enable radiator heat
probe management
(PTC/NTC)
0 1 1 1
MOT_PRB_RES_THR
P95 - Motor NTC or PTC
resistance value for alarm
0 19999 1500 Ohm 1
PRC_MOT_DO_TEMP_THR
P96 - Motor thermal logic
output 14 cut-in threshold
0.0 200.0 100 % PRC_MOT_I_THERM 40.96
KP_MOT_THERM_PRB
P115 - Multiplication factor for
motor PTC/NTC/PT100
analog reference value
0.00 200.00 100 163.84
KP_DRV_THERM_PRB
P117 - Multiplication factor for
radiator PTC/NTC analog
reference value
0.00 200.00 100 163.84
DRV_TEMP_MAX
P118 - Max. temperature
permitted by radiator
PTC/NTC
0.0 150.0 90 °C 10
DRV_START_TEMP_MAX
P119 - Max. temperature
permitted by radiator
PTC/NTC for start-up
0.0 150.0 75 °C 10
DRV_DO_TEMP_THR
P120 - Radiator temperature
threshold for logic output o.15
0.0 150.0 80 °C 10
EN_MOT_THERMAL_ALL
C32 - Motor thermal switch '
Block drive ?
0 1 1 1
MOT_THERM_CURV_SEL
C33 - Auto-ventilated thermal
motors
Range
0 1
0
1
2
3
DRV_TEMP
D25 - Radiator temperature
reading
0 °C 16
MOT_TEMP D26 - Motor temperature 0 °C 16
REG_CARD_TEMP
D40 - Regulation card
temperature
0 °C 16
MOT_PRB_RES
D41 - Thermal probe
resistance
0 Ohm 1
PRC_DRV_I_THERM D28 - Motor thermal current -100 100 0 % soglia All 40.96
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