SINUS PENTA
PROGRAMMING GUIDE
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42. SPEED SEARCHING MENU
42.1. Overview
When a command is sent to disable the drive, the motor idles. When the drive activates again, the Speed Searching
function allows the drive to reach the motor speed.
All parameters relating to this function are included in the Speed Searching submenu in the Configuration menu.
For FOC control, the motor speed of rotation is always known, so this function is always active and independent of the
parameters of the relevant menu.
NOTE The Speed Searching parameters are used for IFD and VTC control algorithm.
When C245 is set to [YES], do the following to activate the Speed Searching function:
– deactivate and reactivate the ENABLE function before t
SSdis
is over (C246);
– if C185 = 1:[Free wheel], open and close the START command before t
SSdis
(C246) is over;
– disable the DC Braking command before the DC braking preset time is over (see the DC BRAKING MENU);
– reset any alarm tripped (with reference other than 0) before t
SSdis
is over.
If C250 ≠ 0 [Disable], the Speed Searching function activates only if the programmed input is active.
Speed searching does not take place when the drive turns off due to mains loss.
If the drive restarts after a time longer than t
SSdis
(C246), frequency output is generated following the acceleration ramp,
and no speed searching takes place.
If C246 0: (Always On), speed searching (if enabled with C245) occurs when the drive restarts (RUN), irrespective of
the time elapsed from disabling.
The figures below show output frequency and motor rpm during speed searching.
After time t
0
for rotor demagnetization, speed searching occurs as follows (see 3 steps below):
Speed at the beginning of the speed searching function depends on the settings in C249.
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