Projecta IM2000 Instrucciones de operaciones descargar pdf (Pagina 40)

Reducing/Disabling the Output Current

The IM483 has the capability of automatically reducing the current in the

motor windings following a move. Use of this feature will reduce motor and

driver heating, thus allowing for cooler operation and improved system power

efficiency.

The output current may be reduced to the level needed to maintain motor

holding torque by means of a 1/8 watt or higher, 1 percent resistor. This

resistor is connected between P2:1 (Reduction Adjust) and P2:2 (Current

Adjust). The value of the reduced output current will also be dependant on the

current adjust resistor value as expressed in the equation below. Figure 7.3

illustrates the connection. If no resistor is placed, the current in the motor

windings will be at the amount set by the current adjust resistor when the

motor is stopped and the driver enabled.

To reduce the current in the motor windings to zero between moves, the drive

may be disabled by pulling the enable/disable input (P1:5) to ground by means

of a sinking output on your controller or PLC, or by placing a shunt between

pins 1 and 2 of connector P2. Note that if the controller continues to send step

clock pulses to the driver, the internal counter on the IM2000 controller ASIC

will continue to increment unless the driver is reset. This will only affect your

system if the On-Full-Step output is used for position monitoring.

The amount of current reduced will depend upon the value of the reduction

adjust resistor (R

Red

) and the value of the current adjust resistor (R

Adj

). The

current will be reduced aproximately 1.0 seconds after the rising edge of the

last step clock pulse. The value of R

Red

is calculated as follows:

Run

is the desired peak running

current. Range 0.4A to 4A Peak

Hold

is the desired peak holding

current. Range 0.2A to 4A Peak

Run

x I

Hold

Red

= 500 x

( I

Run

- I

Hold

)

NOTE: Resistor leads should

be as short as possible to

minimize the amount of noise

coupled into the driver!

P2:1

P2:2

Current Adjust Resistor

1/8 W 1%

Ω

Reduction Adjust Resistor

1/8 W 1%

Ω

Figure 7.3: Current Reduction Adjust Resistor Placement

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 76 77

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Projecta IM2000 Instrucciones de operaciones Pagina 40

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