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Multi-Loop / Four-Post Control

4 Post Control. 2 to 4 Test Profiles. 2 to 4 Control Loops. One Axis. Synchronized Phase.

Multi Loop control is typically used for multiple shakers controlling one test item in a single axis – usually the Z (up/down) axis. One VR9500 Revolution controller hardware unit is required for each control loop. Each controller’s drive output drives a separate shaker. 2 loops, 3 loops and 4 loops can be individually controlled. The same profile, or different profiles (of the same type: Random, Shock, or FDR) can be set for each loop. Phase of output drive is synchronized between outputs for Shock and FDR.

Random: Control 2, 3, or 4 output drive loops simultaneously
Transient/Shock: Control 2, 3, or 4 output drive loops simultaneously, output phase is synchronized
FDR: Control 2, 3, or 4 output drive loops simultaneously, output phase is synchronized
Sine: One master controller is used with the drive signal T’d off for the other controllers. Use multiple input accelerometers for Sine averaging, max, min, or extremal control.

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