Dynamic DX Power Module PMB Installation Manual page 52

Max Motor Temp
Max Motor Temp is the maximum allowed temperature of the motor wire's
insulation. This value will be obtained from the motor manufacturer. Not as
critical as the I²T Threshold setting.
Temp Rollback Min
Temp Rollback Min is the temperature at which thermal roll-back begins.
Temp Rollback Max
Temp Rollback Max is the temperature at which thermal roll-back limits the
output to zero.
HW Current Scaler
The sustained current limit that the PM can supply to a motor is limited to the
programmed Current Limit setting as described above. Because of the
response time of the nominal current limit mechanism transient currents
higher than this value are possible. To reduce the possibility of these transient
currents causing motor degradation due to de-magnetisation, a second fast-
acting current limit mechanism is provided, which is programmable using the
HW Current Scaler parameter.
A HW Current Scaler value of 100% is suitable for a Current Limit setting of
60 Amps and limits the transient current to between 60 - 90 Amps depending
on temperature. Depending on the magnetic characteristics of the motor, it
may be desirable to reduce the value of HW Current Scaler for Current Limit
settings of less than 60 Amps. In this case recommended settings are :
Current Limit (A) PM-S Current (A)
60
50
40
25
PM1 and PM2 would not normally be used with low current motors and
would therefore have the HW Current Scaler set to 100%.
HW Current Scaler (%)
120
100
80
50
47

100
90
80
60
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