General description © Schaltbau Gmb. H Railway vehicles often have to cope with different power supply systems ( eg 1 k. V AC, 1. 5 k. V DC and 3 k. V 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 k. V or AC voltages up to 3 k. V. 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 Schaltbau Gmb. H · 81677 Munich · Klausenburger Str. 6 · Phone: +49(0)89 930 05 -0 · Fax: +49(0)89 930 05 Return to page 1 no change-over actions in 1500 V AC networks 350 Control unit ZH 914. pps when 1 / 6
Ordering code 500… 1440 V 2 Table 2, safety check at the main heater with 500… 1440 V 3 Table 1, safety check at the main heater with 0… 1440 V 5 Table 1, safety check at the main heater with 500… 1440 V, new features 6 Table 2, safety check at the main heater with 500… 1440 V, new features 1 2 3 4 ZH 914 Selection of voltage range: 1 Table 1, safety check at the main heater with Number of control-outputs for voltage ranges: 4: [1 k. V AC], [1. 5 k. V DC], [3 k. V DC] 5: [1 k. V AC], [1. 5 k. V DC], [3 k. V AC] 3: [1 k. V AC], [1. 5 k. V AC & 1. 5 k. V DC], [3 k. V DC & 3 k. V AC] Switch-off characteristics: N Normal switch-off characteristics Maximum switch-off voltage U max-off, according to table 1 or table 2, see selection voltage range E Extra switch-off characteristics Extra maximum switch-off point for 3 k. V DC range, all other voltage ranges according to Control voltage of the device: table 1 or table 2, see “Selection of voltage range” 24 V DC according to UIC 120 16. 8 V … 158 V N I Return to page 1 © Schaltbau Gmb. H Special features for 1 k. V AC range: 16 2/3 Hz and 50 Hz allowed 16 2/3 Hz only 4 5 Number of selected voltage ranges: 4: 1 k. V AC, 1. 5 k. V DC, 3 k. V DC 5: 1 k. V AC, 1. 5 k. V DC, 3 k. V AC Schaltbau Gmb. H · 81677 Munich · Klausenburger Str. 6 · Phone: +49(0)89 930 05 -0 · Fax: +49(0)89 930 05350 Control unit ZH 914. pps 2 / 6
Available program tables defining power supply systems Table 1: Definition of power supply systems of European coaches according to UIC 550 Name of Switch-on voltage Minimum voltage Maximum voltage Re-entry voltage Extra maximum power U min-on switch-off point ( switch-on point )switch-off point supply U in-off U max-on = m = system U min-on-X U max-off + Y 1 k. V AC 750 V +/- 50 V 50 - 80 V 1250 +/- 50 V 50 - 80 V --1. 5 k. V DC 950 V +/- 50 V 50 - 80 V 1975 +/-75 V 80 - 125 V --1. 5 k. V AC 1100 V +/- 50 V 50 - 80 V 1860 +/- 75 V 80 - 125 V --3 k. V DC 1900 V +/- 75 V 50 - 125 V 4050 +/- 100 V 150 - 250 V 4150 V 3 k. V AC 1900 V +/- 75 V 50 - 125 V 4050 +/- 100 V 150 - 250 V --- Table 2: Definition of very special power supply systems of European coaches Return to page 1 © Schaltbau Gmb. H · 81677 Munich · Klausenburger Str. 6 · Phone: +49(0)89 930 05 -0 · Fax: +49(0)89 930 05350 Control unit ZH 914. pps 3 / 6
244 208 250 230 8 23 6 Monitoring and control unit ZH 914 Dimension Diagram Return to page 1 © Schaltbau Gmb. H · 81677 Munich · Klausenburger Str. 6 · Phone: +49(0)89 930 05 -0 · Fax: +49(0)89 930 05350 Control unit ZH 914. pps 4 / 6 180 160
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 0 V. . . 1440 V the old ZH 814 type detects correct operation. The new ZH 914. 1 xx and ZH 914. 2 xx types, however, detect correct operation only if there are 500 V. . . 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. Return to page 1 © Schaltbau Gmb. H · 81677 Munich · Klausenburger Str. 6 · Phone: +49(0)89 930 05 -0 · Fax: +49(0)89 930 05350 Control unit ZH 914. pps 5 / 6
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 0 V. . . 1440 V the old ZH 814 type detects correct operation. The new ZH 914. 1 xx and ZH 914. 2 xx types, however, detect correct operation only if there 500 V. . . 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 )! Return to page 1 © Schaltbau Gmb. H · 81677 Munich · Klausenburger Str. 6 · Phone: +49(0)89 930 05 -0 · Fax: +49(0)89 930 05350 Control unit ZH 914. pps 6 / 6
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