Xylem IM167 R8 Aquavar CPC (Centrifugal Pump Control) - Manual (Page 114)

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Ramp 2 - Fast Deceleration: This ramp is the fast run down time used when the pump is
shutting down. If the setting R2 setting is too fast, the pump may oscillate, or “hunt” while it
tries to attain the set point. If it is too slow, the actual process value may rise well above the
set point. NOTE: AQUAVAR UNITS ABOVE 10 HP, RAMP 1 AND RAMP 2 SHOULD BE SET
FOR AT LEAST 8 – 10 SECONDS.
NOTE: Air in the pump system may cause a condition that looks like oscillation or hunting.
Make sure all the air is purged from the system before trying to change the Ramp 2 setting.
Parameter Name Value/Range Note(s)
13.02 RAMP 2 0-1800s Pressure default = 5 sec
FAST DECEL Level, Temperature default = 20 seconds
Ramp 3, Slow Acceleration: This ramp is the slow run up time used when the pump is
operating within its setpoint window. If the R3 setting is too slow, pressure or flow may be
slow to respond to the set point as demand varies. A setting too fast may lead to oscillation.
Parameter Name Value/Range Note(s)
13.03 RAMP 3 0-1800s Pressure default = 60 seconds
SLOW ACCEL Flow [magnetic flow meter] default = 50 sec
Level, Temperature default = 200 seconds
Ramp 4, Slow Deceleration: This ramp is the slow run down time used when the pump is
operating within its set point window. If the R4 setting is too slow, it will lead to oscillation. A
setting too fast may delay the motor shut-down when demand is reduced.
Parameter Name Value/Range Note(s)
13.04 RAMP 4 0-1800s Pressure default = 60 seconds
SLOW DECEL Flow [magnetic flow meter] default = 50 sec
Level, Temperature default = 200 seconds
FEATURES