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OTHER SETPOINTS THAT MIGHT BE REQUIRED FOR MOTOR PID CONTROL
• Max Change Rate = The VFD motor PID output is limited by this parameter to prevent large instantaneous
changes to the motor speed.
• Dead-band = used to establish a range on either side of the set-point in which no capacity control action will
occur. Initial Setpoint: 2.5%
• Min Spd Point = used to prevent the compressor from running too slowly which can adversely affect hydro-
dynamic sealing, heat transfer and lubrication. Initial Setpoint: 50%
• Setpoint Ramping Rate = used to control how fast the compressor responds to the required capacity control
action. Initial Setpoint: 20 Unit/min
• Unloading Rate = used to control how fast the unloading action occurs due to a safety override. Initial Set-
point: 20%/min