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Siemens Building Technologies
SED2 variable speed drives
CM1U5192en
HVAC Products
Programming
01.2002
722.5=Digital input 6 (requires P0706 set to 99, BICO)
722.6=Digital input 7 (via analog input 1, requires P0707 set to 99)
722.7=Digital input 8 (via analog input 2, requires P0708 set to 99)
Index:
P1230[0] : 1st command data set (CDS)
P1230[1] : 2nd command data set (CDS)
Caution2:
Frequent use of long periods of DC braking can cause the motor to overheat.
Note:
This delay time is set in P0347 (demagnetization time). If this delay is too short, overcurrent trips can occur.
P1232
DC braking current
Defines the level of DC current in [%] relative to the rated motor current (P0305).
Unit: %
Min: 0
Def: 100
Max: 250
Level 3
P1233
Duration of DC braking
Defines duration for which DC injection braking is to be active following an OFF1 command.
Unit: s
Min: 0
Def: 0
Max: 250
Level 3
Value:
P1233=0 : Not active following OFF1.
P1233=1 - 250 : Active for the specified duration.
Caution
Frequent use of long periods of DC braking can cause the motor to overheat.
Note:
The DC braking function causes the motor to stop rapidly by applying a DC braking current (the current applied also
holds the shaft stationary). When the DC braking signal is applied, the variable speed drive output pulses are blocked
and the DC current not applied until the motor has been sufficiently demagnetized (demagnetization time is calculated
automatically from motor data).
P1236
Compound braking current
Defines DC level superimposed on AC waveform. The value is entered in [%] relative to rated
motor current (P0305)..
Unit: %
Min: 0
Def: 0
Max: 250
Level 3
Value:
P1236=0
: Compound braking disabled.
P1236=1 - 250 : Level of DC braking current defined as a [%] of rated motor current (P0305).
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
Enables / disables Vdc controller.
Unit: -
Min: 0
Def: 0
Max: 3
Level 3
Details:
The Vdc controller dynamically controls the DC link voltage to prevent overvoltage trips on high inertia systems.
Settings:
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
Selects the possible sources for contactor changeover control
Unit: -
Min: 0
Def: 0
Max: 7
Level 2
Settings:
0
Bypass disabled
1
Controlled by variable speed drive trip
2
Controlled by DIN - see P1266
3
Controlled by DIN & variable speed drive trip
4
Controlled by variable speed drive frequency
5
Controlled by variable speed drive frequency & variable speed drive trip
6
Controlled by variable speed drive frequency & DIN
7
Controlled by variable speed drive frequency & DIN & variable speed drive trip
r1261
BO: Contactor control word
Output word from the bypass feature that allows external connections to be made.
Unit: -
Min: -
Def: -
Max: -
Level 2
Bit fields:
Bit00
Motor supplied by drive
0
YES,
1
NO
Bit01
Motor supplied by mains
0
YES,
1
NO
P1262
Bypass dead time
Time delay between switching contactors to allow motor to allow motor to demagnetize.
Unit: s
Min: 0
Def: 1.000
Max: 20.000
Level 2
P1263
De-Bypass time
Time delay before a request to switch back to the variable speed drive is acted on.
Unit: s
Min: 0
Def: 1.0
Max: 300.0
Level 2
P1264
Bypass time
Time delay before a request to switch to mains is acted on.
Unit: s
Min: 0
Def: 1.0
Max: 300.0
Level 2
P1265
Mains frequency
Mains frequency.
Unit: Hz
Min: 12.00
Def: 50.00
Max: 650.00
Level 2
P1266
BI: Bypass command
Mains frequency.
Unit: -
Min: 0:0
Def: 0:0
Max: 4000:0
Level 2
