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2.8 GENERAL INSTRUCTIONS AND PRECAUTIONS
- Never combine SCR low frequency choppers with SEM2 modules. The filter capaci-
tors contained in the SEM2 module will change the SCR chopper operation and
subject it to excessive workload. If it is necessary to use two or more control units
(eg. Lift + traction), the choppers must 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, and a
lower voltage may prevent the logic operating.
- During battery recharge, the SEM2 must be completely disconnected from the bat-
tery. As well as altering the charge current read by the battery charger, the module
can be damaged by higher than normal voltages supplied via the charger.
- The SEM2 module should only be supplied by a traction battery. Do not use the
outputs of convertors or power supplies. For special applications please contact the
nearest Zapi service centre.
- Start the machine the first time with the drive wheel(s) raised from the floor to ensure
that any installation errors 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 discon-
nected, and a short circuit is made between Battery Positive and Battery negative
power terminals of the chopper using a Resistor between 10
W
and 100
W
.
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.
