HEIDENHAIN iTNC 530 HSCI - Monitoring of the Power Supply Unit

902 HEIDENHAIN Technical Manual iTNC 530 HSCI
6.11.6 Monitoring of the power supply unit
The rectified supply voltage of the power supply unit is monitored. The supply
voltage must lie within a defined range
(400 V +/– 10 %). If this is not the case the power supply unit reports an AC
fail (PF.PS.AC
).
At the same time, the DC-link voltage is monitored:
 If approx. 800 V– with UM xxx, UR xxx or over approx. 830 V– with UE xxx,
UxC is exceeded, the NC revokes the pulse release (reset) for the IGBT of
the power module. The motors coast out of loop to a stop. No energy is
returned to the dc link.
 Below approx. 300 V AC (UE, UxC) the power supply unit reports AC fail
(PF.PS.AC
).
 If the DC-link voltage falls below approx. 410 V– (UV, UM, UR, UE, UxC), the
power supply unit reports a powerfail (signal PF.PS.ZK
).
 Below approx. 200 V–, (UV, UR) the control is reset (signal RES.PS
).
Immediately below it the power supply unit switches off.
 The evaluation of the two signals -PF.PS.AC and -PF.PS.DC is activated by
MP2195 bit 7 and bit 8, respectively.
Since the AC fail is reported to the control before the powerfail, the control has
more time to react to the subsequent DC-link voltage failure.
If a power fail is triggered on the control, all drives are brought to a controlled
stop. The PLC outputs are switched off and the control freezes to ensure that
the hard disk can no longer be accessed.
The control must be turned off and on again.
Also, the performance of each UV(R) supply unit is monitored. If the maximum
power of a UV(R) is exceeded, the spindle power is reduced if the spindle is
supplied by the same UV. This function can be deselected in MP2195 bit
10 = 1.
MP2195 Power monitoring of the UV(R)
Input: Bit 10
0: Monitoring active
1: Inactive
Inverter signal Meaning
AC fail (PF.PS.AC
) Failure of supply voltage for inverter
Power fail
(PF.PS.ZK)
DC-link voltage failure
Note
Only certain HEIDENHAIN power supply units provide the AC-fail signal
(see the Technical Manual for "Inverter Systems and Motors"). If you are
using power supply units that do not provide this signal, you must not
select the AC-fail signal in MP2195.