50 Program features
The following examples describes the first, second and third stage of acceleration in
quick ramp mode.
• First stage of acceleration (a) is to lift the impeller so that the fluid protects the
bearings and sealings. Otherwise, the pump can get damaged. For example, 0 Hz
to 25/30 Hz with ramp time of 1 second.
• Second stage of acceleration (b) is an optional. The pump produces a valid flow in
this region, so the reasonable acceleration rate is requested to limit the turbidity.
The effective inside region is 25/30 to 43/45 Hz and the ramp times typically are
between 10 to 45 seconds.
• Third stage of acceleration (c) is a normal ramp. The pump provides a reasonable
flow rate. The drive uses normal ramp times, for example, 60 seconds.
Settings
• Menu - Primary settings - Ramps
• Speed reference ramping: Parameters 23.12…23.13 and 46.01
(pages 162 and 236).
• Frequency reference ramping: Parameters 28.72…28.73 and 46.02
(pages 173 and 236).
• Motor potentiometer: Parameter 22.75 (page 161).
• Emergency stop (“Off3” mode): Parameter 23.23 Emergency stop time
(page 163).
• Pump protections - Quick ramps: Parameter group 82 Pump protections (page
274).
Constant speeds/frequencies
Constant speeds and frequencies are predefined references that can be quickly
activated, for example, through digital inputs. It is possible to define up to 7 speeds
for speed control and 7 constant frequencies for frequency control.
WARNING: Speeds and frequencies override the normal reference
irrespective of where the reference is coming from.
Settings
• Parameter groups 22 Speed reference selection (page 154) and 28 Frequency
reference chain (page 167).
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