Lenze DSD - Manual (Page 482)

18 Drive dimensioning messages
18.12 Brake resistor
482
Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
18.12.4 Max. permissible resistance value is exceeded
18.12.5 Thermal time constant of the brake resistor is too small
18.12.6 Temperature monitoring of the cartridge responds
Note!
The resulting brake resistance is > 220 Ohms.
The inverter may shut off due to overvoltage.
Select resistance value between 180 and 220 Ohms.
Cause Effects Possible remedies
The max. permissible resistance has
been exceeded.
Due to overvoltage, the inverter
switches off.
• The drive will not be braked to
standstill at the deceleration
ramp anymore.
Select brake resistor with a resist-
ance between 180 and 220 Ohm.
Warning!
The brake resistor has a thermal time constant <120 s.
In case of an uncoordinated DC-bus connection, the time constant must be >120 s.
DSD cannot carry out a safe check of the brake resistor.
Cause Effects Possible remedies
With an uncoordinated multi-axis
system, only brake resistors with
thermal time constant >120 s are
permissible.
The brake resistor is overheated.
Fire hazard!
Select a brake resistor with a higher
thermal time constant.
Warning!
Temperature monitoring of the brake cartridge responds.
Do not use brake cartridge! Device may be destroyed!
Cause Effects Possible remedies
For the brake cartridge used, an addi-
tional temperature monitoring mode
is calculated in the device. This tem-
perature monitoring responds.
The device may be destroyed. • Use of the brake cartridge is not
permissible.
• Use external brake resistor.