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1.8 GENERAL INSTRUCTIONS AND PRECAUTIONS
- Never combine SCR low frequency choppers with COMBI SEM-1 modules. The filter
capacitors contained in the COMBI SEM-1 module would change the SCR chopper
operation and subject it to excessive workload. If it is necessary to use two or more
control units, the choppers should both be of the High Frequency Zapi family.
- Do not connect the chopper to a battery with a different nominal voltage to the value
indicated on the chopper. A higher battery voltage may cause MOS failure. A lower
voltage may prevent the logic operating.
- During battery recharge, the COMBI SEM-1 must be completely disconnected from
the battery. Beside changing the charging current seen by the battery charger, the
module can be damaged by higher than normal voltages supplied via the charger.
- The COMBI SEM-1 module should only be connected to a traction battery. Do not
use converters outputs or power supplies. For special applications please contact the
nearest Zapi Service Centre.
- In the first instance, start the machine with the drive wheels raised from the floor to
ensure that any installation error do not compromise safety.
- After operation, even with the Key Switch open, the internal capacitors may remain
charged for some time. For safe operation, we recommend that the battery is
disconnected, and a short circuit is made between Battery Positive and Battery Ne-
gative power terminals of the chopper using a Resistor between 10W and 100W.
Minimum 5 W.
- The susceptibility and electromagnetic emmission levels are seriously influenced by
installation conditions. Take particular care with the length of cables and wires, types
of electrical connections, and braided/screened wires. Zapi declines any
responsibility for incorrect or bad operation that can be attributed to the above
circumstances. Above all, the manufacturer of the machine must ensure that the
requirements of EN 50081-2 are met.
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