Automatic Alarm Function; Safety Functions During Operation; Power Supply Requirements; Control Output Protection - HM-Funktechnik HM 2225 Installation And Operation Instruction Manual

4.1.4 Automatic alarm function

This function will only be active if the DIL switch no. 3 is set to enable it (see section 4.6).
If the receiver is on, and the operator does not press a button on the transmitter for six
minutes, the receiver switches into alarm mode and initiates a prealarm warning via the
vehicle horn. If the operator does not respond to this by pressing either the Gas+ button or a
Ziehen button, after a further two minutes, the receiver will switch into an external alarm
mode. An extern alarm trigger signal is given as an output from the receiver unit and, as
described above, it can be used to trigger an emergency call system such as the HM
WECC2.

4.2 Safety functions during operation

In case the operator has to work on a load, which is already connected to the skidder´s
winch, he is reminded to use the standby safety function. He can switch the relay bus-bar
voltage off, just by pressing the Stop button on the hand-held transmitter.
This function disables all the remote control functions so that, if the operator inadvertantly
presses a button on the transmitter, the winch is not set into operation. This control driver
voltage can be switched on again according to the procedure described in section 2.1.

4.3 Power supply requirements

The receiver unit is designed for operation on equipment with a 12 or 24V supply and
DC
there are no adjustments or modifications needed. The voltage supplied to the unit from the
vehicle is switched through relays to give the control output signals, so that 12V is
DC
supplied, the outputs will be at 12V , or if 24V is supplied the outputs will be at 24V .
DC DC DC

4.4 Control output protection

In the receiver each output relay is protected by a 6 A poly-switch fuse installed in series
with the output relay contacts. If a maximum current of 6 A is exceeded on an output, due to
a short circuit or excessive load, the fuse will drop out and isolate that output. The fuse will
then automatically reset after the short circuit or excessive load is removed from the output.
These fuse elements are not permanently damaged by short circuits, and they protect the
rest of the circuitry from being damaged, however, they may become hot if any output is
constantly overloaded and this heat can damage the output relays.
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