Ramp Bit; Latched Precise Start - Danfoss VLT MCB 113 Operating Manual

Operating Guide | VLT® Extended Relay Card MCB 113
Option Function
[31] Pulse edge Counts the number of pulse flanks per sample time. This gives a higher resolution at high frequencies, but is
triggered not as precise at lower frequencies. Use this pulse principle for encoders with low resolution (for example
30 PPR).
Pulse
Sample time
Illustration 6:
[32] Pulse time- Measures the duration between pulse flanks. This gives a higher resolution at lower frequencies, but is not as
based precise at higher frequencies. This principle has a cutoff frequency, which makes it unsuited for encoders
with low resolutions (for example 30 PPR) at low speeds.
Spee d [rpm]
Pulse
Timer
Sample time
Time counter
Illustration 8:
[34]

Ramp bit 0

Enables a selection between 1 of the 4 ramps available, according to
[35] Ramp bit 1 Same as [34] Ramp bit 0.
Table 13: Preset Ramp Bit
Preset ramp bit
Ramp 1
Ramp 2
Ramp 3
Ramp 4
Table 14: 5-10 Digital Inputs - 4
Option
[40] Latched pre-
cise start
[41] Latched pre-
cise stop in-
verse
Danfoss A/S © 2020.01
Pulse Flanks per Sample Time
Spee d [rpm]
a Time[sec] b Time[sec]
Time Start Read Timer: Read Timer:
20 timer tides 20 timer tides
Duration Between Pulse Flanks
Function
A latched precise start only requires a pulse of 3 ms on terminals 18 or 19. When using for parameter 1-83
Precise Stop Function [1] Cnt stop with reset or [2] Cnt stop w/o reset: When the reference is reached, the
drive internally enables the precise stop signal. This means that the drive does the precise stop when the
counter value of parameter 1-84 Precise Stop Counter Value is reached.
Sends a latched stop signal when the precise stop function is activated in parameter 1-83 Precise Stop
Function. The latched precise stop inverse function is available for terminals 18 or 19.
Parameter Setup
table 13.
1 0
0 0
0 1
1 0
1 1
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