73/126
Siemens Building Technologies SED2 variable speed drives CM1U5192en
HVAC Products Programming 01.2002
6.4.6 Bypassing the VSD
There are applications demanding maximum motor output. Additionally, there are
applications requiring a VSD bypass system for safety reasons. For these cases, the
SED2 has an integrated bypass function.
SED2
Mains supply
Motor starters
Mechanical
interlock
5192Z25en
P1260
Defines the possible triggers for changing over to bypass operating mode.
The following settings are possible:
0 Bypass disabled (factory setting).
1 Controlled by VSD trip.
2 Controlled by DIN, see P1266.
3 Controlled by DIN and VSD trip.
4 Controlled by VSD frequency.
5 Controlled by VSD frequency and VSD trip.
6 Controlled by VSD frequency and DIN.
7 Controlled by VSD frequency and DIN and VSD trip.
r1261
Read parameter for the bypass function showing how the motor is driven:
The following states are possible:
Bit 00 Motor supplied by drive 0 Yes
1No
Bit 01 Motor supplied by mains 0 Yes
1No
P1262
Defines the time delay between changing over the VSD to bypass and vice-versa to
demagnetize the motor.
See bypass diagram below.
Setting range: 0 to 20 s
Recommended setting: 1 s (factory setting).
Parameterizing the
bypass function
(commissioning)
To Next Page
Loading...
Need help?
General