Siemens Simovert Masterdrives Compendium page 1213

Parameter Description
P347 Function parameter for correcting the symmetrical valve
ON VoltsCompens. voltage drops of the inverter IGBTs.
347 The parameter value is pre-set during automatic
parameterization (P115 = 1).
P348 Function parameter for selection of the deadtime
Dead Time Comp. compensation in the gating unit
348 The deadtime compensation eliminates the voltage error
which is obtained as a result of the interlock times in the
gating unit.
Compensation is enabled/disabled during automatic
parameterization (P115 = 1).
Parameter values:
0: no deadtime compensation in the gating unit
1: deadtime compensation in the gating unit enabled
Setting instructinos:
For high pulse frequencies, for motors with low stator time
constant (r125) (positioning drives) and for long cables, it
may be practical to disable the compensation in order to
improve the smooth running characteristics at low speeds.
2. For future use.
P349 Function parameter for the compensation time of the
T(DeadTimeComp.) gating unit interlock.
349 In the case of induction motors, the value is pre-set during
motor data indentification (P115 = 2).
Setting instructions:
- For positioning drives or for the improvement of the
smooth running characteristics at low frequencies, it may
be practical to disable the compensation (P348 = 0). In
this case, it is not permissible to reset P349, in order that
the missing compensation voltage can be calculated
internally from it.
- At high pulse frequencies (abov approx. 6 kHz), it is not
recommended to disable the compensation as the torque
ripple would then increase again due to voltage errors in
the range of the zero passages of the phase currents.
P350* Function parameter for entering the reference current. The
Ref Amps value entered is for normalizing all current variables and
corresponds to a connector value of 4000 H (100 %). The
350 closed-loop control system can process up to twice the
value entered. The set value 0 A is not allowed.
The reference quantity for current (P350) or torque (P354)
should just be changed with the same integer multiple
number. The effective n-regulation will be changed by the
same factor.
Caution:
By changing the set value, the current limitations are
changed as well.
Siemens AG 6SE7087-6QX70 (Edition AL )
SIMOVERT MASTERDRIVES Compendium Motion Control
Data Read/write
Init: 7,0 Menus:
Min: 0,0 - Parameter menu
Max: 25,0 + Gating unit
Unit: V - Drive setting
Indices: - - Upread/free access
Type: O2 Changeable in:
- Drive setting
- Ready to switch on
- Operation enabled
Init: 1 Menus:
Min: 0 - Parameter menu
Max: 2 + Gating unit
Unit: - - Upread/free access
Indices: - Changeable in:
Type: O2 - Drive setting
- Ready to switch on
- Operation enabled
Init: 0,00 Menus:
Min: 0,00 - Parameter menu
Max: 25,55 + Gating unit
Unit: μs - Upread/free access
Indices: - Changeable in:
Type: O2 - Drive setting
- Ready to switch on
- Operation enabled
Init: 0,0 Menus:
Min: 0,0 - Parameter menu
Max: 6553,5 + Motor/encoder
Unit: A + Motor data
Indices: - - Drive setting
Type: O2 - Upread/free access
Changeable in:
- Drive setting
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