Operating Instructions

SED2 VFD Operation & Maintenance Manual
154 Siemens Building Technologies, Inc.
Dependency: Setting in P0640 (motor overload factor [%]) limits boost.
Note: Acceleration boost can help to improve response to small positive setpoint changes.
P1312 Starting boost
Min: 0.0 Def: 0.0 Max: 250.0
Level 2
Details: Applies a constant linear offset (in [%] relative to P0305 (rated motor current)) to active V/f curve (either linear or
quadratic) after an ON command and is active until setpoint is reached for the first time. This is useful for starting
loads with high inertia.
Setting the starting boost (P1312) too high will cause the inverter to limit the current, which will in turn restrict the
output frequency to below the setpoint frequency.
Dependency: Setting in P0640 (motor overload factor [%]) limits boost.
Note: Increasing the boost levels increases motor heating.
Σ Boosts ≤ 300/l
mot
* R
s
Priorities are allocated to the boost parameters as follows:
P1310 > P1311 > P1312
P1335 Slip compensation
Min: 0.0 Def: 0.0 Max: 600.0
Level 2
Details: Dynamically adjusts output frequency of inverter so that motor speed is kept constant independent of motor load.
Value: P1335= 0% : Slip compensation disabled.
P1335=100% : This uses the motor data and motor model to add the rated slip frequency rated motor speed and
rated motor current.
Note: Gain adjustment enables fine-tuning of the actual motor speed (see P1460-gain speed control).
100%=standard setting for warm stator
P1336 Slip limit
Min: 0 Def: 250 Max: 600
Level 2
Details: Compensation slip limit in [%] relative to r0330 (rated motor slip), which is added to frequency setpoint.
Dependency: Slip compensation (P1335) active.
r1337 CO: V/f slip frequency
Min: - Def: - Max: -
Level 3
Details: Displays actual compensated motor slip as [%].
Dependency: Slip compensation (P1335) active.
P1499 Scaling accel. torque control
Min: 0.0 Def: 100.0 Max: 400.0
Level 3
Details: Enters scaling of acceleration in [%] for sensorless torque control (SLVC) at low frequencies.