Operating Instructions

SED2 VFD Operation & Maintenance Manual
152 Siemens Building Technologies, Inc.
Dependency: Active after OFF1/OFF3 command.
Note: Increasing the value will generally improve braking performance; however, if you set the value too high, an
overcurrent trip may result.
P1240 Configuration of Vdc controller
Min: 0 Def: 1 Max: 3
Level 3
Details: The Vdc controller dynamically controls the DC link voltage to prevent overvoltage trips on high inertia systems.
Enum: 0 =Vdc controller disabled
1 =Vdc-max controller enabled
2 =Vdc-min controller (Kinetic buffering) enabled
3 =Vdc-max and Vdc-min controller enabled
Note: Vdc max automatically increases ramp-down times to keep the DC-link voltage (r0026) within limits (P2172)
Vdc min is activated if DC-link voltage falls below minimum level. The kinetic energy of the motor is then used to
buffer the DC-link voltage, thus causing deceleration of the drive.
P1260 Source of changeover control
Min: 0 Def: 0 Max: 7
Level 2
Settings: 0=Bypass disabled
1=Controlled by VFD trip
2=Controlled by DIN – see 1266
3=Controlled by DIN and VFD trip
4=Controlled by VFD frequency
5=Controlled by VFD frequency and VFD trip
6=Controlled by VFD frequency and DIN
7=Controlled by VFD frequency and DIN and VFD trip
r1261 BO: Contactor control word
Min: - Def: - Max: -
Level 2
Bit Fields Bit 00 Motor supplied by drive 0...YES, 1...NO Bit 01 Motor supplied by mains 0...YES, 1...NO
P1262 Bypass dead time
Min: 0 Def: 1.000 Max: 20.000
Level 2
P1263 De-Bypass time
Min: 0 Def: 1.000 Max: 300.0
Level 2
P1264 Bypass time
Min: 0 Def: 1.0 Max: 300.0
Level 2
P1265 Mains frequency
Min: 12.00 Def: 50.00 Max: 650.00
Level 2