68 Program features
Settings
• Speed reference ramping - Parameters
23.11
…
23.15
,
23.32
Shape time 1
(page
193
),
23.33
Shape time 2
(page
193
) and
46.01
Speed scaling
(page
289
).
• Torque reference ramping - Parameters
01.30
Nominal torque scale
(page
117
),
26.18
Torque ramp up time
(page
202
) and
26.19
Torque ramp down time
(page
202
).
• Frequency reference ramping - Parameters
28.71
…
28.75
and
46.02
Frequency
scaling
(page
289
).
• Jogging - Parameters
23.20
Acc time jogging
(page
191
) and
23.21
Dec time
jogging
(page
191
).
• Motor potentiometer - Parameter
22.75
Motor potentiometer ramp time
(page
187
).
• Emergency stop (“Off3” mode) - Parameter
23.23
Emergency stop time
(page
192
).
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
177
) and
28 Frequency
reference chain
(page
203
).
Critical speeds/frequencies
Critical speeds (sometimes called “skip speeds”) can be predefined for applications
where it is necessary to avoid certain motor speeds or speed ranges because of, for
example, mechanical resonance problems.
The critical speeds function prevents the reference from dwelling within a critical band
for extended times. When a changing reference enters a critical range, the output of
the function freezes until the reference exits the range. Any instant change in the
output is smoothed out by the ramping function further in the reference chain.
When the drive is limiting the allowed output speeds/frequencies, it limits to the
absolutely lowest critical speed (critical speed low or critical frequency low) when
accelerating from standstill, unless the speed reference is over the upper critical
speed/ frequency limit.
ACS380 FW.book Page 68 Friday, May 4, 2018 4:18 PM
ghv Vertriebs-GmbH
| Am Schammacher Feld 47 | 85567 Grafing | T 49 80 92 81 89 0 | [email protected] |
www.ghv.de
