Performance Motion Devices CME N Series, User Manual

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50 ION/CME N-Series Digital Drive Developer Kit User Manual
3
3.4 Conversion Factors, Defaults and
Limits
To correctly control various N-Series ION features it may be helpful to know certain drive-specific scale factors. The
following tables summarize these values.
3.4.1 Conversion Factors, Low Power Units
The following table provides electrical conversion factors for low power level N-Series ION units (P/Ns:
DD4X1X0056/02).
These factors convert various integer Magellan IC command arguments (referred to as having units of counts) to
physical quantities such as amperage, volts, etc... For more information on the Magellan Motion Control IC refer to
the
Magellan Motion Control IC User Guide . For more information on C-Motion commands refer to the C-Motion/PRP
II Programming Reference .
* Some C-Motion commands specifying a current may have a scaling of two times this value. Refer to the Magellan Motion Control IC
User Guide for more information.
3.4.2 Defaults & Limits, Low Power Units
The following table provides default values, low limits and high limits for various specifiable drive-related parameters
for low power level N-Series ION units (P/Ns: DD4X1X0056/02).
Unit
Example C-Motion
Commands Scaling Example usage
Amps GetCurrentLoopValue .231 mA/count* A command request to read the
ActualCurrent parameter returns a value
12,345. This corresponds to a current of
12,345 counts * 0.231 mA/count = 2.851A
Volts SetDriveFaultParameter
GetBusVoltage 10.0 mV/count To set an overvoltage threshold of 50V, the
command value should be 50 V *1,000 mV/
V / 10.0 mV/count = 5,000
Temperature SetDriveFaultParameter
GetTemperature .00391 °C/count To set an overtemperature threshold of
65 °C, the command value should be 65 °C
/ .0039 °C/count = 16,624
I
2
t continuous
current
SetCurrent .231 mA/count
To set an I
2
t continuous current of 1.0A, the
command value should be 1.0A * 1,000 mA/
A / 0.231 mA/count = 4,329
I
2
t energy
SetCurrent
.00588 A
2
Sec/count To set an I
2
t energy of 5.0 A
2
Sec, the
command value should be 5.0 A
2
Sec /
0.00588 A
2
Sec/count = 850
Setting Default Setting Low Limit High Limit
Overtemperature limit 75.0 °C 0 °C 75.0 °C
Overtemperature hysteresis 5.0 °C 0 °C 25.0 °C
Overvoltage limit 60.0 V 10.0 V 60.0 V
Undervoltage limit 10.0 V 10.0 V 56.0 V
I
2
t continuous current limit,
Brushless DC motor
1.5 A 0.0 A 1.5 A
I
2
t continuous current limit, DC
Brush motor
1.5 A 0.0 A 1.5 A