Anaheim BLD72-1 manual Clock Modes, Motor On/Off Input, Sourcing Clock Input Sinking Clock Input

Clock Modes

The BLD72 has two clock options: Clock and Direction, or Dual Clock operation. Jumper JP2 is used to select the clock option. Basically JP2 selects Terminal 5 as either the Direction input or the CCW input.

With the Clock and Direction option (most common option), clock pulses applied to the Clock input (Ter- minal 6) cause the motor to step. The direction of the motor is determined by the logic level of the Direction input (Terminal 5). Jumper JP2 must be in the “2-3” position for this mode (see Figure 4 and Table 1). Physical direction also depends on the motor wiring.

With the Dual Clock option, clock pulses applied to the Clock input (Terminal 6) cause the motor to step in the clockwise direction. Clock pulses applied to the CCW input (Terminal 5) cause the motor to step in the counterclockwise direction. Jumper JP2 must be in the “1-2” position for this mode.

Either positive or negative going pulses may be used by setting jumpers in the appropriate position (see Table 1). To determine which setting to use, first consider the type of clock pulse output on the pulse generator or indexer (controller). If the clock output on the controller is open-collector type (sinking), then use the negative going jumper setting. If the clock output on the controller is a pnp or p-channel (sourcing) type, then use the positive going jumper setting. If the clock output on the controller is a TTL/CMOS type (totem pole), then either setting will work; but the jumper setting should be chosen based on the level of the clock output when the controller is not pulsing. If the clock is low when not pulsing, then use positive going jumper settings. If the clock is high when not pulsing, then use the negative going jumper setting.

The clock inputs (Clock and CCW) are pulled up to +5Vdc through a 10K ohm resistor for negative going clock inputs; or pulled down to 0VDC through a 10K ohm resistor for positive going clock inputs. The pullups/pulldowns are followed by an RC filter. See Figure 2 and Figure 3.

Figure 2: Sourcing Clock Input

Figure 3: Sinking Clock Input

Motor On/Off Input

The motor on/off input allows de-energizing a motor without disturbing the positioning logic. After reener- gizing the motor, a routine can continue. This reduces motor heating and conserves power, especially in applications where motors are stopped for long periods and no holding torque is required. If holding torque is required (such as when lifting a load vertically), then the motor must stay energized.

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