Cleveland Motion Controls Quantum Tension Controller REV A - Manual (Page 32)

Menu OUTPUTS
6.3
Current limitation
Principle
This function limits the current in the coil when using EMAG brakes and EMAG clutches directly.
As the supply of the coil is done by a pulse width modulation on the rectified supply of the
QUANTUM, the parameter drives the duty cycle of the PWM.
How does it work
Enter a value between 1-100% corresponding to the maximum current for the application.
Example
Case of an EMAG 50 (65Nm - 1A nominal current-200hm impedance) used for a 50Nm
maximum torque application (equivalent to 0.7A).
1. QUANTUM supply with a 24Vac transformer.
The supply of the coil is done on the 24V rectified meaning around 34Vdc.
The impedance is 20Ohm, so the max available current is 1.7A.
To limit the current at 0.7A, the duty cycle is 41%.
2. QUANTUM supply with a 24Vdc converter.
The supply of the coil is done on the 24Vdc
The impedance is 20Ohm, so the max available current is 1.2A.
To limit the current at 0.7A, the duty cycle is 58%.
This parameter is useful for dancer applications by limiting the current at the lowest value
needed to pull the dancer for the max roll with the max tension.
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