Xylem HVS 1.1 - 3.4 - Manual (Page 27)

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Time setting will influence the control of the pump and SHOULD NOT BE CHANGED at
normal operation. Possible settings for each ramp 0,05 - 1000 sec.
7.3.5 Accel high
Accel. High
10 Sec
Excessively fast running up time may overload the
inverter.
7.3.6 Decel high
Decel. High
10 Sec
Excessively fast running down time tends to cause
oscillation or hunting or can cause an error
(OVER VOLTAGE) during pump down of the pump.
Excessively slow running down time tends to generate over pressure.
7.3.7 Accel Low
Accel. Low
70 Sec
Excessively fast running up time tends to cause
oscillation.
7.3.8 Decel Low.
Decel. Low
70 Sec
A too fast setting leads to oscillation.