Spindle With Integral Dsp - HEIDENHAIN TNC 426 PB/M Technical Manual

Spindle with
integral DSP
December 2001
For a spindle with integral DSP, the maximum braking performance during
spindle braking in an emergency stop can be entered in MP2391.x, and the
maximum braking performance during a power fail can be entered in
MP2395.x.
If the power limit (MP2393.x) is used in normal spindle operation, then the
maximum braking performance is limited to the lower of the two values in
MP2393 and MP2391.
Example:
Function
Power limit MP2393.x
Maximum braking
performance MP2391
Limiting the braking
performance to
Warning
After an emergency stop the spindle DSP automatically switches off after
a fixed period of time. If the spindle needs more time, the drive will switch
off and the spindle will coast to a stop.
n
Up to 280 476-02: 5 seconds
n
280 476-03 and later: 10 seconds
Braking upon emergency stop
7 7 7 7 For inverters with regenerative power supply, enter MP2391.x = 0 so as
not to limit the braking power.
7 7 7 7 Calculate for inverters with braking resistors the input value for MP2391.x
from the following formula:
2
U
Z
MP2391.x = ------------------------- -
⋅
R 1000
R = Braking resistance [Ω]
(PW 110, PW 210 = 18 Ω, PW 120 = 10 Ω, UP 110 = 9 Ω)
U = dc-link voltage [V]
Z
(UV 130, UE 2xx, UE 2xxB = 565 V; UV 120, UV 140, UV 150, UR 2xx = 650 V))
Braking during power fail
For the LE 426 M with spindle DSP and the LE 430 M, during a power fail the
"SH1B" signal at X6 is maintained for 3 seconds to allow the spindle to
decelerate. At the same time, the control tries to reset the PLC outputs.
7 7 7 7 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 MP2395.x with the above formula.
7 7 7 7 Calculate for inverters with braking resistors the input value for MP2395.x
with the above formula.
Case 1
10 kW
5 kW
5 kW (from MP2391) 5 kW (from MP2393)
Spindle
Case 2
5 kW
10 kW
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