Functions Ideally Suited for Fans and Pumps
NEW Multiple rating:
The rating can be selected between the two types LD (light duty) or SLD (superlight duty) depending on the load of the fan/pump to be used. The optimum VSD capacity can be selected suitable for the motor to be used.
NEW System cost reduction – PID multiple loops (two loops):
Two PID operation units are available in the VSD. The VSD can perform PID control of the motor operation and control the external equipment at the same time.
Direct setting of the PID set point:
The PID set point can be set directly from the operation panel. The setting can be easily changed at hand.
NEW Water volume control with multiple pumps – multi-pump function:
By controlling the pumps connected in parallel (up to four pumps) by the PID control by one VSD, water volume, etc. can be adjusted.
NEW Visibility improvement:
With the optional LCD operation panel the unit can be changed from “%” to other easy-to-see units. Maintenance and adjustment is facilitated by using a familiar unit of air volume, temperature, etc., for indication.
Energy saving in low speed operation – PID output shutoff (sleep) function:
During PID control, the operation is stopped when the deviation (set point measured value) is small and the output frequency is low, and the operation is restarted when the deviation becomes large. This function restricts energy consumption during low speed operation with low motor efficiency.
NEW Avoidance of rapid acceleration / deceleration using PID action – PID pre-charge function:
Before PID action the water flow to the pipe is controlled by operating the motor at a constant speed until the measured value reaches the set level. This is used to avoid rapid acceleration/deceleration caused by starting the PID action while the pipe is empty, and prevent a water hammer action, etc.
Shorter start-up time under PID control – PID automatic switchover function:
The operation is started without PID control until the output frequency reaches the specified frequency. The system can be started faster at the start of operation.