Siemens SIROTEC Function Manual

V/f control (vector control)
6.5 Vdc control
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
309
When the line supply returns, the DC link voltage increases again. 5% above the V
dc_min
switch-on level, the V
dc_min
control is switched off again. The motor continues operating
normally.
If the power supply is not re-established, the motor speed continues to drop. When the
threshold in p1297 is reached, this results in a response in accordance with p1296.
Once the time threshold (p1295) has elapsed without the line voltage being re-established, a
fault is triggered (F07406), which can be parameterized as required (factory setting: OFF3).
The V
dc_min
controller can be activated for a drive. Other drives can participate in supporting
the DC link, by transferring to them a scaling of their speed setpoint from the controlling drive
via BICO interconnection.
Note
If it is expected that the line supply will return, you must make sure that the converter is not
disconnected from t
he line supply. It could become disconnected, for example, if the line
contactor drops out. The line contactor must be supplied, e.g. from an uninterruptible power
supply (UPS).
Vdc_max control
Figure 6-9 Switching the V
dc_max
control on/off
The switch-on level for V
dc_max
-control (r1282) is calculated as follows:
p1294 (automatic sensing of the
ON level (V/f))
Switch-on level of the
V
dc_max
control (r1282)
Comment
Value
Meaning
= 0
Switched out
r1282 = 1.15 · p0210
p0210 ≙ device supply voltage
= 1 Switched in r1282 = V
dc_max
- 50 V V
dc_max
≙ overvoltage threshold
of the Motor Module

Siemens SIROTEC Specifications

General

Brand	Siemens
Model	SIROTEC
Category	DC Drives
Language	English