Page 37 of 72
6.8.4.3
Outputs
All eight outputs consist of normally open voltage free contacts that close when the output is
on. Each output is isolated from all others. Hence to have an output switch high one side must
be tied to the supply and the other is used to drive the load. The opposite applies for switch
low output. Since all outputs a fully isolated from each other this allows some outputs to
switch high and others to switch low.
Note: These outputs are not fuse protected through the
RCI-1550, hence the protection must be provided by
external means.
6.8.4.4
Snubber diode protection to crane fitted solenoids or relays
The use of snubbed inductive loads (ie solenoids and relays) is strongly recommended,
however care must be taken to ensure correct polarity connection to these devices.
6.8.4.5
Defining the status of Outputs (normally closed OR open)
Provision has been added to the circuit to define the state of each output if there is an on-
going fault in the CPU section. The reasoning for this provision is that the user may want one
output to fault to an off position (ie Motion Cut) and another to fault to an on position (ie
External audible alarm). The status is defined using DIP switch SW1 with the switch position
number referring to the respective output. When the switch is “ON”, the corresponding output
will be energised if the CPU fails, or alternatively when the switch is “OFF” the
corresponding output will be de-energised if the CPU fails. This ‘fault state’ can be selected
manually by the user by activating the disable input.
6.8.4.6
Specifications
Relay Outputs:
5 ampere @ 30 VDC
Switched Inputs:
Input current approx. 6mA @ 24V DC
File : 1550-Telescopic-HRT.DOC
Issue Date: - 01/08/05
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