Monitoring Of The Power Supply Unit - HEIDENHAIN iTNC 530 Service Manual

2.2.6 Monitoring of the power supply unit

Regenerative systems:
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).
Regenerative and non-regenerative systems:
At the same time, the dc-link voltage is monitored:
If approx. 760 Vdc (UV 120, UV 140, UV 150, UR 2xx: approx. 800 V) 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.
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 power fail (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 Vdc (UV 120, UV 140, UV 150, UR 2xx, UV 105: approx. 180 V) the power
supply unit switches off.
The UV 105 power supply unit reports a power fail if the dc-link voltage is < approx. 385 V and
the supply voltage is < approx. 330 V.

With MP2150, you define which inverter signal is to trigger the Power fail on the control.
Inverter signal
AC fail
Power fail
Since the AC fail is reported to the control before the power fail, 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 displays the error message POWERFAIL.
The control must be turned off and on again.
MP2150
Input:
2 – 12
Explanation
(PF.PS.AC) Failure of supply voltage for inverter
(PF.PS.ZK) DC-link voltage failure
Note
Only the regenerative HEIDENHAIN inverter units provide the
AC-fail signal.
Power-fail signals on the control
0: AC fail
1: Power fail and AC fail
2: Neither power fail nor AC fail
3: Power fail
HEIDENHAIN Service Manual iTNC 530