Raven Installation Guide | Servo Control Operation |
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4.3Current Gain Control (CGC)
The Raven amplifier is equipped with Current Gain Control (CGC) for improved performance of low induction motors. Connecting pin J2/5 to J2/4 reduces the gain of the current loop, thus enabling the use of low inductance motors without the insertion of an additional inductor. The default (pin J2/5 left open) is high gain.
Shorting this pin to the circuit common pin (J2/4) reduces the proportional gain (P) of the current loop by approx. 70%.
For permanent selection, a simple short is recommended. For remote selection, the following scheme should be used.
Figure 4-1: CFM and CGC Remote Control
The following table should be used for calculating minimum inductance values.
| Minimum Inductance for High Gain | Minimum Inductance for Low Gain | |||
5/60 | L Load (millihenry) > | L Load (millihenry) | > 4.8*10 | * Vsupply (Volt) | |
10/60 | L Load (millihenry) > | L Load (millihenry) | > 2.4*10 | * Vsupply (Volt) | |
15/60 | L Load (millihenry) > | L Load (millihenry) | > 1.6*10 | * Vsupply (Volt) | |
25/60 | L Load (millihenry) > | L Load (millihenry) | > 0.9*10 | * Vsupply (Volt) | |
3/100 | L Load (millihenry) > | L Load (millihenry) | > 6.6*10 | * Vsupply (Volt) | |
10/100 | L Load (millihenry) > 9*10 | * Vsupply (Volt) | L Load (millihenry) | > 2.2*10 | * Vsupply (Volt) |
15/100 | L Load (millihenry) > 6*10 | * Vsupply (Volt) | L Load (millihenry) | > 1.5*10 | * Vsupply (Volt) |
20/100 | L Load (millihenry) > 4*10 | * Vsupply (Volt) | L Load (millihenry) | > 1.1*10 | * Vsupply (Volt) |
2/200 | L Load (millihenry) > 49.5*10 | L Load (millihenry) > 12*10 | |||
6/200 | L Load (millihenry) | > 16.5*10 | L Load (millihenry) > 4*10 | ||
10/200 | L Load (millihenry) | > 10*10 | *Vsupply(Volt) | L Load (millihenry) > 2.4 | * Vsupply (Volt) |
15/200 | L Load (millihenry) | > 6.5*10 | *Vsupply(Volt) | L Load (millihenry) > 1.6 | * Vsupply (Volt) |
