872 HEIDENHAIN Technical Manual iTNC 530 HSCI
Braking the spindle/spindles in an emergency stop
For inverters with regenerative power supply, enter MP2390.x = 0 so as
not to limit the braking power.
Calculate for inverters with braking resistors the input value for MP2390.x
from the following formula:
R = Braking resistance [Ω]
U
Z
= DC-link voltage [V]
The maximum braking power from MP2390.x can be greater than the power
limit from MP2392.x.
Braking of the spindle during an emergency stop can be delayed by the time
in MP3550. This avoids tool breakage during power milling, because low
spindle speeds might result in the spindle coming to a standstill before the
axes do. However, the spindle braking is delayed by no more than half a
spindle revolution.
Braking the spindle/spindles during a power fail
During a power fail, the "SH1B" signal at X51 to X60 is maintained for 10 more
seconds, in order to brake the spindle/spindles. At the same time, the control
tries to reset the PLC outputs.
If you are using an additional braking resistor (e.g. UP 110) in connection
with an inverter with regenerative power supply, calculate the value to
be entered in MP2394.x from the above formula.
Calculate for inverters with braking resistors the input value for MP2394.x
with the above formula.
MP2390.x Maximum braking power
Input: 0: No limiting of the braking power in an emergency stop
0.001 to 3000.000 [kW]
MP2394.x Maximum brake power for power failure
Input: 0: No limiting of the braking power in a power failure
0.001 to 3000.000 [kW]
MP3550 Delay of emergency-stop reaction of spindles
Input: 0.001 to 0.100 [s]
0 = Delay not active
MP2390.x
U
Z
2
R1000⋅
--------------------------=
If after entry of a value in MP2390.x or MP2394.x the mechanics are
overloaded by the braking process, lower the value in MP2390.x or
MP2394.x until you have found an optimum between braking time and
mechanical loading.
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