Pagina 7
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Protection against accidental startup: Protection against accidental startup:
Protection against accidental startup: Protection against accidental startup:
Protection against accidental startup:
A precise sequence of operations is necessary for starting the machine.
If these operations are not carried out correctly, the machine will not start.
The request for running must be activated after the key and handle microswitch (or seat micro-
switch).
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Protection against uncontrolled movements:Protection against uncontrolled movements:
Protection against uncontrolled movements:Protection against uncontrolled movements:
Protection against uncontrolled movements:
The contactors do not close if:
- the power unit is not functioning
- the accelerator does not go below the minimum value stored increased by 2 V
- the logic is not perfectly functional
- one running microswitch is stuck.
1.6 THERMAL CONSIDERATIONS1.6 THERMAL CONSIDERATIONS
1.6 THERMAL CONSIDERATIONS1.6 THERMAL CONSIDERATIONS
1.6 THERMAL CONSIDERATIONS
- The heat generated by the control unit must be dissipated. For this to be possible, the
compartment must be ventilated and the cooling surfaces ample.
- The cooling system is dimensioned on the basis of the performance required of the machine.
For situations in which ventilation is poor and heat exchange difficult because of the
materials used, it is advisable to use forced air ventilation.
- The power dissipated by the module varies depending on the current and the work cycle.
1.7 GENERAL NOTES ON USE OF H2P1.7 GENERAL NOTES ON USE OF H2P
1.7 GENERAL NOTES ON USE OF H2P1.7 GENERAL NOTES ON USE OF H2P
1.7 GENERAL NOTES ON USE OF H2P
- Never combine SCR low frequency choppers with H2 modules, as the filtre condensers
contained in the H2 module alter SCR chopper functioning, subjecting it to excessive workloads.
Thus, if you wish to use two or more control units (e.g. lift + traction), they must all be of
the high frequency ZAPIMOS family.
- Do not connect the chopper to a battery with a different nominal voltage than that indicated
on the chopper identification plate. A higher battery voltage can cause MOS failure. A lower
battery voltage prevents the module from functioning.
- During battery recharge, the H2 module must be completely disconnected from the battery,
as in addition to altering the charge read by the battery charger, the module can be damaged
by the overload voltages generated by the charger.
- The H2 module must only be supplied using a traction use battery; do not use outputs of
straighteners or power suppliers. For special applications, consult the nearest ZAPI service
centre.
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