ABB ACSM1 - Page 171

Parameters and firmware blocks
171
45.05 AMBIENT TEMP FW block: MOT THERM PROT (see above)
Defines the ambient temperature for the thermal protection mode.
-60…100 °C Ambient temperature.
45.06 MOT LOAD CURVE FW block: MOT THERM PROT (see above)
Defines the load curve together with parameters 45.07 ZERO SPEED LOAD and 45.08 BREAK
POINT.
The value is given in percent of nominal motor current. When the parameter is set to 100%, the
maximum load is equal to the value of the parameter 99.06 MOT NOM CURRENT (higher loads heat
up the motor). The load curve level should be adjusted if the ambient temperature differs from the
nominal value.
The load curve is used by the motor thermal protection model when parameter 45.02 MOT TEMP
SOURCE is set to (0) ESTIMATED.
50…150% Motor current above breakpoint.
45.07 ZERO SPEED LOAD FW block: MOT THERM PROT (see above)
Defines the load curve together with parameters 45.06 MOT LOAD CURVE and 45.08 BREAK
POINT. Defines the maximum motor load at zero speed of the load curve. A higher value can be used
if the motor has an external motor fan to boost the cooling. See the motor manufacturer's
recommendations.
The value is given in percent of nominal motor current.
The load curve is used by the motor thermal protection model when parameter 45.02 MOT TEMP
SOURCE is set to (0) ESTIMATED.
50…150% Motor current at zero speed.
45.08 BREAK POINT FW block: MOT THERM PROT (see above)
Defines the load curve together with parameters 45.06 MOT LOAD CURVE and 45.07 ZERO SPEED
LOAD. Defines the break point frequency of the load curve i.e. the point at which the motor load curve
begins to decrease from the value of parameter 45.06 MOT LOAD CURVE to the value of parameter
45.07 ZERO SPEED LOAD.
The load curve is used by the motor thermal protection model when parameter 45.02 MOT TEMP
SOURCE is set to (0) ESTIMATED.
0.01…500 Hz Load curve breakpoint.
50
100
150
45.06
45.08
45.07
I/I
N
(%)
I = Motor current
I
N
= Nominal motor current
Drive output frequency