Dynamic DX-REMG91, Руководство по установке

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GBK63648
:
Issue 3
– February 2012
16
3.4 Jack Socket Switch Monitoring
The installer needs to carefully consider the implications of failure of either the „Mode„
or „Aux‟ switches plugged into the G91 jack sockets or equivalent functions within the
system installation such as DX-ARC-SWB. This is especially true of „Aux‟ switch with the
G91S when set up as a single switch scanning device. Failure of the switch, severing
or damage to the switch wiring, or the inadvertent unplugging at the G91 can all
render the switch function ineffective and each need to be assessed for risk.
The G91 offers switch monitoring options for the „Mode‟ and „Aux‟ inputs that can be
used to partially mitigate risk due to switch failure. These options can be enabled
using Wizard (
See Programming section 6.3.1 ).
3.4.1 Unmonitored switch circuit with a Standard Switch
Allows the use of a standard Normally Open or Normally Closed switch but will NOT
detect a failure in any part of the switch circuit.
3.4.2 Monitored circuit with a modified switch
This option is the most secure and is the recommended option for safety critical
applications, it provides detection for disconnection and failed switches. To use this
option the switch must be modified by adding 2 resistors as shown below.
These resistors allow the switch wiring to be continuously
monitored and will ideally be as close to the actual switch as
possible (e.g. inside the switch assembly).
To enable this option set the Switch Monitoring to „yes‟ within
Wizard (See Programming section 6.3.1).
A specific buddy button (purple in colour) is available with this circuit built in. Part no.
SWTA9993.