PowerFlex 40 and 400 Drive Control Logic

Control Terminal Blocks Description and Control Logic

WARNING

To reduce risk of electric shock, severe injury or death, allow machine power to remain off for three minutes minimum prior to working in and around AC drive. Proceed with caution.

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NOTE: Do not connect AC drive digital common, analog common, or common terminals to chassis ground.

Input Mode Parameter

The control terminal functions are determined in part by the “Start Source” parameter #36. Changing this parameter affects the function of some terminals.

Speed Selection

Motor speeds on digitally-controlled AC drives are controlled by solid state or mechanical switch closure inputs to Digital In 1, Digital In 2, and Digital In 3 terminals. Similarly, motor rotation direction is controlled by inputs to Start/Run FWD and Direction/ Run REV terminals. Refer to Figure 10.

An inactive control input terminal (H) will measure approximately 24v DC while an active control input terminal (L) will measure less than 1v DC. When a control input (i.e., Digital In 1, 2, 3, 4, Fwd, Rev, or Stop) is connected to a common terminal (terminal 4), the voltage on the control input terminal is reduced to near zero and the input is activated.

Tables 8 – 14 designate the speed and rotation direction based on inputs to the control terminals. The AC drive’s input status parameters display of 1s and 0s at various machine actions can be viewed while monitoring parameter #13 and/or #14. When the control input terminal voltage is high (inactive) the status display will read “0” (logic 0). When the control input terminal voltage is low (active) the status will read “1” (logic 1).

Balance Output

The AC drive balance output signal is transmitted to the machine controller by the operation of an on-board normally open relay or transistor. Refer to Figure 10. The AC drive will analyze the wash load distribution during certain drain steps and communicate the severity of load imbalance to the machine controller. The machine controller then determines if the load is suitably distributed for the programmed spin speed. The severity of load imbalance is communicated digitally by the on-board relay or transistor using a series of pulses or continuous open or closed state.

CAUTION

Never permanently jumper the AC drive balance output terminals or short the wires in these terminals together. This will override the balance detection routine and cause the wash cycle to abort, potentially causing machine damage or personal injury in the process.

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Stop/Enable Input

The Stop Input function is machine dependent. The input is typically used to disable the drive either when the frame vibration safety limit switch has been tripped or when the loading door has been opened. Refer to the applicable machine electrical schematic for details on the connection of this input. When the Stop Input signal is interrupted, the control input signals must be removed and reapplied to restart the motor operation.

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