3 – 672 HEIDENHAIN Service Manual iTNC 530
3.3.6 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.
Excessive voltage If approx. 760 V- (UV 120, UV 140, UV 150, UR 2xx: approx. 800 V) is exceeded, the NC revokes
the pulse release (reset) for the IGBT (end stage) of the power stage. The motors run out non-
controlled. No energy is returned to the dc link.
Possible
causes of error
The list does not claim to be complete; ask your machine tool builder!
You may add your own experiences!
Defective braking resistor (conversion of electrical energy to heat energy not possible)
Defective infeed/regenerative feedback module (energy recovery not possible)
Interruption in the primary supply (fuses, wires, etc.; energy recovery not possible)
Too low
voltages
If the dc-link voltage falls below approx. 385 Vdc (UV 120, UV 140, UV 150, UR 2xx: approx.
410 V), the power supply unit reports a powerfail (signal PF.PS.ZK
)
If the dc-link voltage falls below approx. 155 Vdc (UV 120, UV 140, UV 150, UR 2xx, UV 105:
approx. 200 V), the control is reset (signal RES.PS).
Below approx. 135 Vac (UV120, UV140, UV150, UR2xx, UV105: approx. 180V), the power
supply unit switches off.
The UV 105 power supply unit reports a powerfail if the dc-link voltage
is < approx. 385 V and the supply voltage is < approx. 330 V.
8 With MP2150, you can define which inverter signal is to trigger powerfail on the control.
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.
MP2150 Powerfail signals on the control
Input: 0: AC fail
1: Power fail and AC fail
2: Reserved
3: Powerfail
Inverter signal Meaning
AC fail (PF.PS.AC
) Failure of supply voltage for inverter
Powerfail (PF.PS.ZK
) DC-link voltage failure
Only the regenerative HEIDENHAIN inverters provide the AC-fail signal.
Using module 9167, the machine manufacturer can switch the dc-link voltage monitoring on
or off.
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