6 – 164 HEIDENHAIN Technical Manual TNC 426, TNC 430
6.11.6 NC Supply Voltage Monitoring
The rectified voltage is monitored. Monitoring is worthwhile only with digital
axes. The supply voltage must lie within the defined range (See “Supply
Voltage for Control-is-Ready Signal (LE 426 M, LE 430 M)” on page 3 – 29). A
transient overvoltage (approx. 5 s) up to 720 Vdc is permitted.
If 720 Vdc is exceeded, the NC revokes the pulse release (reset) for the IGBT
of the power stage. The motors coast out of loop to a stop. No energy is
returned to the dc link.
Below 385 Vdc, all drives are brought to a controlled stop. PLC outputs are
switched off, and the control displays the error message POWER FAIL. The
control must be turned off and on again.
Below 155 Vdc the control is reset.
Below 135 Vdc the dc-link power supply switches off.
Module 9167 Supply voltage monitoring
With this module you can switch the monitoring for supply voltage >385 Vdc
on and off.
If you don’t call the module during the first PLC run-through, the supply voltage
monitoring is automatically started after the first PLC run-through.
Call:
PS B/W/D/K <Command code>
0: Supply voltage monitoring for >385 Vdc off
1: Supply voltage monitoring for >385 Vdc on
CM 9167
PL B/W/D <Error code>
0: Command executed
–1: Transferred parameter invalid
Error recognition:
Marker Value Meaning
M4203 0 Supply voltage monitoring on or off
1 Error code in W1022
W1022 2 Transferred parameter invalid
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