Watson-Marlow MM440 - Manual (Page 210)

3 Functions Issue 10/06
MICROMASTER 440 Operating Instructions
210 6SE6400-5AW00-0BP0
NOTE
¾ The switch-on threshold V
DC chopper
of the dynamic resistor braking is dependent
on P1254
V
DC chopper
(P1254 = 0) ≠ V
DC chopper
(P1254 ≠ 0).
a) Auto-detect circuit enabled (P1254 = 1):
- U
DC-Chopper
(P1254 = 1) is automatically calculated when the drive
inverter runs-up - i.e. after the line supply voltage has been
connected.
- Using the auto-detect function, the U
DC-Chopper
threshold automatically
adapts itself to the line supply voltage at the particular installation
location.
b) Auto-detect function disabled (P1254 = 0):
- 0210 P 2 13 . 1 U
Chopper , DC
⋅ ⋅ =
- The U
DC-Chopper
threshold is immediately re-calculated after entering
P0210
- P0210 must be adapted to the particular installation location
¾ External braking modules (chopper units) including braking resistor can be used
with all of the sizes, FS FX and FS GX. When engineering the system, the
particular braking module / resistor must be taken into consideration.
WARNING
¾
Braking resistors, which are to be mounted on MICROMASTER 440, must be
designed so that they can tolerate the power dissipated.
¾ If an unsuitable braking resistor is used there is a danger of fire and that the
associated drive inverter will be significantly damaged.
¾ The chopper control, integrated in the drive converter is designed for the
braking resistor value assigned in Catalog DA51.2,
e.g.: MICROMASTER 440
6SE6440-2UD23-0BA1
brake resistor 6SE6400-4BD12-0BA0
brake resistor value 160 Ω
¾ A brake resistor with a lower resistance value will destroy the drive converter.
In this case, an external braking unit must be used.
¾ When operational, the temperature of braking resistors increases – do not
touch ! Ensure that there is sufficient clearance around the unit and there is
adequate ventilation.
¾ A temperature protection switch must be used to protect the units against
overheating.