Allen-Bradley 1336-Series AC Drives

Control Terminal Blocks Description and Control Logic

Control terminal functions are unique to each Allen- Bradley Drive. Each drive’s control terminal is addressed independently.

Control Terminal (TB2/TB3) Function

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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WARNING

The controller is supplied with an internal 5V supply. Dry contacts or open collectors are required for discrete control inputs. If an external voltage is applied, component failure could occur.

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NOTE: Do not connect drive common terminals (TB2 or TB3) to ground. There must be no ground potential difference between source and drive.

Input Mode Parameter

The control terminal functions are determined in part by the Input Mode parameter #21. Changing this parameter affects the function of some terminals. All machines equipped with A-B 1336 drives use Input Mode “12”.

NOTE: If the Input Mode is changed, power must be cycled to the drive for the change to take effect.

Speed Selection

Motor speeds are controlled by solid state or mechanical switch closure inputs to SW1, SW2, and SW3 in conjunction with STR and STF (direction) inputs. Refer to Figure 50 and Table 50.

Table 50 designates the preset speed selection based on the inputs to the control terminals. A disconnected control terminal will seek the high control voltage condition (approx. 5 Volts DC). To activate a control input (i.e., SW1, SW2, etc.), the terminal is connected to a common terminal (TB3-21, TB3-25, or TB3-29) to lower the control voltage to a low condition (less than 1 Volt DC).

The Input Status’ display of 1s and 0s represents the drive’s display of parameter #55. These inputs can be viewed in the status display with a Human Interface Module (HIM or parameter unit). Parameter #55 displays the Input Status. When voltage is high (inactive) for an input, the status display will read “0” (Logic 0). When voltage is low (active) for an input, the status display will read “1” (Logic 1).

Table 50 contains the correct display value for each function. The sixth display digit from the left in Input Status parameter does not correspond to a control input function. Refer to Table 50.

NOTE: The Preset Speed logic is specific to the type of computer the machine is equipped with (i.e., WE-6 or V-Computer).

Balance Output

The AC drive Balance Output is transmitted to the machine controller by the closure of an on-board normally open mechanical relay shown in Figure 50. This action occurs at distribution speed connecting TB3-16 and TB3-17 when the drive detects an acceptable balance condition.

CAUTION

MACHINE DAMAGE AND/OR PERSONAL INJURY. Balance output terminals TB2-16 and TB2-17 should never be jumpered. This action will force machine beyond designed tolerances.

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Stop Input (Door Interlock /Out-of-Balance Switch)

The Stop Input function is machine dependent. The input is used in some machines to disable the drive in case of an excessive out-of-balance condition; in others, the input is used to disable the drive when the door is open. Refer to the applicable electrical schematic to see the correct wiring of this input. The control inputs must be removed and reapplied to the drive for motion after a STOP input has been interrupted.

Jumpered Inputs

Carefully review electrical schematics when replacing a drive. Some machine models jumper the STOP, Motor Temp Input, and/or ENABLE inputs to the drive (refer to Figure 50).

NOTE: Wire or metal clip jumpers may be used and can be easily overlooked during a replacement.

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