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Run-up and switch-off of the 2-speed motor.
Control sequence
"Switch-on delay", "Switch-off delay", min. switch-on time and min. switch-off time
are considered.
Function diagram
0
0
TiOnMin1
TiCst
TiRup
TiOffMin
TiOnMin1
0
TiRup
TiOnMin2
TiOnMin1
Speed 2
Speed 1
Off
TiRup = Runup
time
Key
TiCst = Rundown
time
DlyOn = Switch-on
delay
DlyOff = Switch-off
delay
TiOnMin1
=
On time minimum, Step 1
TiOnMin2
=
On time minimum, Step 2
TiOffMin
=
Off time minimum
Locking 2
nd
speed by
outside temperature
You can lock the second speed if the temperature drops below an adjustable
outside temperature value.
Main menu > Commissioning > Settings > ....
or
Main menu > Settings > Aggregates > Motor > Motor 1...6 >
Settings
Operating line
Range
Factory setting
Speed 2 locked (OT-dependent)
50...
250 °C, ---
- - -
Setting "---" disables this function. The 2
nd
speed is locked if the function is active
and if there is not outside temperature value during operation.
Notes
8.4.4
Twin motor
Use the "Twin motor" to control e.g. a twin pump.
Purpose
In addition to default functions, RMS705B offers special control functions to
optimally control a twin motor:
Special control functions
Run priority changeover for motor faults, automatic
or
manual.
Adjustable changeover period for orderly changeover of motors.
110 / 216
Siemens
Switching and monitoring device RMS705B
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01.04.2010