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General description Railway vehicles often have
to cope with different power supply systems ( eg
1 kV AC, 1.5 kV AC, 1.5 kV DC and 3 kV DC ). The
monitoring and control unit ZH 914 monitors the
power supply system. When there is a change in
the voltage the ZH 914 will activate the
change-over unit and change the position of the
auxiliary switches to ensure the correct
operation of train systems and equipment. The
microprocessor controlled device monitors power
supply systems working with DC voltages up to 5
kV or AC voltages up to 3 kV. The ZH 914
differentiates between two to five different
power supply systems and provides five different
output signals needed to control the change-over
units. Special features and new ones ? CE
certificate, EMC-tested microprocessor
controlling ? protection against faulty
switching ? no change-over actions under load
possible ? no change-over actions in 1500 V AC
networks when phase is changed. The parameters
of the power supply systems are defined in
program tables, easy to change (see Ordering
code).

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Available program tables defining power supply
systems
Table 1 Definition of power supply systems of
European coaches according to UIC550
1.5 kV AC
1100V /- 50V
50 - 80 V
1860 /- 75V
80 - 125 V
---
3 kV DC
1900V /- 75V
50 - 125 V
4050 /- 100V
150 - 250 V
4150V
3 kV AC
1900V /- 75V
50 - 125 V
4050 /- 100V
150 - 250 V
---
Table 2 Definition of very special power
supply systems of European coaches
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Replacing ZH 714 types
Note for replacing a ZH 714 type by a ZH 914
type After each operation of the change-over
unit all control units will test the correct
position of the switches by switching on one
part of the electrical heater. If there are 0V
... 1440 V the old ZH 814 type detects correct
operation. The new ZH 914.1xx and ZH 914.2xx
types, however, detect correct operation only if
there are 500V...1440 V. This means that whenever
the ZH 914 will be tested there has to be at
least a minimum of 500 V at the test point.
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Replacing ZH 814 types
Note for replacing a ZH 814 type by a ZH 914
type 1. After each operation of the
change-over unit all control units will test the
correct position of the switches by switching on
one part of the electrical heater. If there are
0V ... 1440 V the old ZH 814 type detects
correct operation. The new ZH 914.1xx and ZH
914.2xx types, however, detect correct operation
only if there 500V...1440 V. This means that
whenever the ZH 914 will be tested there has to
be at least a minimum of 500 V at the test point.
2. The ZH 814 has a 8-pin connector, the ZH 914
has a 10-pin connector. So replacing a ZH 814 by
a ZH 914 you always have to change the cable,
too ( see table )!