UD - 319472K - 73 -FRENDE
2.5.4- Interference suppression
In the event of inductive loads on the relay outputs (contactor coils, solenoid valves or electro-
brakes), interference suppression devices such as capacitors, RC circuits, diodes, etc. must
be placed directly at the terminals of the controlled components using the shortest possible
connections.
2.5.5- Electrical power supply protection
Protection against overcurrents (EN60204-1 § 7.2) resulting from overvoltages.
A fuse or other protection device should be provided in the power supply circuit of the receiver
(see wiring diagram for standard assemblies, item F in appendix D). The assigned current is
defined in the table in § «UDR receiver technical characteristics».
2.5.7- Auxiliary control
Measures should be taken to ensure, that when the radio control is not in service, another
control system can be used to ensure the safety of the operator and the manipulated load.
2.5.6- Minimum and maximum current of relay outputs
Be sure not to exceed the minimum and maximum characteristics specified in § «UDR receiver
technical characteristics» by installing, if necessary, an additional load or intermediate relays
(auxiliary contacts in electrical cabinet for power control, for example).
2.5.8- Choice of operating radio frequency
The 64 radio channels in 433-434MHz / 911-918MHz or 12 channels in 869MHz of the UD
provide a broad range of choices among the available frequencies. To ensure good operating
quality, it is important that the radio channel used be free (as well as the preceding and the
following one) throughout the area in which the machine will be controlled.
If several radio remote controls are operating on the same site, frequencies spaced by at least
two channels (for example: 5, 7, 9 …) should be used and, if necessary, a frequency plan
should be drawn up, specifying the various machines controlled and their working frequency.
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