January 2012 3.6 Supply Voltages in the HSCI System 195
X31: Input voltage
of the PSL 135
Supply voltage: 400 V ± 10 % or 400 V– to 750 V–
Connection:
Through the connection to 400 V (L1, L2) via X31, the output voltages of the
PSL 135 are available as soon as the machine's main switch has been turned
on. These voltages are indispensable to be able to boot the control.
Since the power to the PSL 135 is supplied through the DC-link, the voltage
fed into the DC-link by the motors that are still running can be used during line
voltage failures. The PSL 135 uses the supply voltage buffered via the DC-link
to maintain the power supply for the control until the inverter system has been
shut down properly by the control.
Connecting terminal Assignment
L1 Phase 1 / 400 V~ ±10 % / 50 Hz to 60 Hz
L2 Phase 2 / 400 V~ ±10 % / 50 Hz to 60 Hz
+UDC 400 V– to 750 V–
–UDC 0 V–
Protective ground (YL/GN),
≥ 10 mm
2
Connecting lead:
Wire cross section: at least 1.5 mm
2
(AWG 16)
Conductor protection (back-up fuse):
Fuses or a motor protection switch of 6.3 A or
greater depending on the wire cross section
used.
Line fuse:
Internal protection of the PSL (4 A).
Tightening torque:
for the connecting terminals
0.5 to 0.6 Nm
Grounding terminal:
≥ 10 mm
2
(AWG 6)
Strain relief:
Ensure that the connecting cables are not subject to excessive strain.
If the power supply is other than 400 V, an autotransformer is required.
Otherwise, an isolating transformer is not necessary when using a
PSL 135.
HEIDENHAIN recommends connecting the PSL 135 power supply unit to
the Uz DC-link voltage and the 400 V supply voltage (X31).
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