Connections from External Devices for Fault Indications
These circuits are provided on a single five-position plug-in barrier strip connector. All Inputs are fully
isolated from the CI-1 and LSI-16(e) internal circuits. The Isolated Ground provides a circuit return that is
not directly connected to the CI-1 and LSI-16(e) Ground.
These inputs allow the signaling of faults from external devices to the Vocia system so it may indicate and
log faults that could affect emergency operation. These fault signals are typically derived from contact
closures on external devices. For multiple devices (e.g. Multiple UPS units), fault contacts from each
device may be ‘wired-OR’ connected (in parallel) to the fault input. UPS fault inputs are typically derived
from UPS units used in the system (e.g. for backup powering of Vocia Amplifier units). PSU fault inputs
are typically derived from battery backed power supplies used to power parts of a Vocia system.
EWS PSU fault inputs are derived from optional emergency microphones (EWS-x) to indicate loss of
power supply. Ethernet fault inputs are derived from fault contacts of industrial Ethernet switches used in
critical parts of a Vocia system. All fault inputs are asserted by connecting the relevant pin to Isolated
Ground. The UPS Fault, PSU Fault and EWS PSU Faults must be connected to 24V when non-asserted
either by direct connection or through pull-up resistor (maximum 2.2k
Ω
). The 24V reference voltage
output on the power supply connector may be used for this purpose. The Ethernet Fault input is pulled up
internally and does not need an external pull up.
Connections to LSI-16(e)
These circuits are provided on:
•
Four five position plug in barrier strip connections
•
One three position plug in barrier strip connector
•
One DC barrel jack.
Circuit connections may be made by directly connecting pin-for-pin to the vertically adjacent connector.
Short interlinking cables are provided with the CI-1 for this purpose. Refer to the LSI-16(e) Operation
Manual for the circuit functions of these connectors.
Note that the LSI-16(e) PSU Fault, Protection Fault and Path Fault outputs are connected to the CI-1
purely for the purpose of providing required monitoring resistors (these outputs are not otherwise used by
the CI-1). If these outputs are required for remote fault indications, the relevant connections should be
removed from the Monitored Outputs connector of the LSI-16(e). As described in the LSI-16(e) Operation
Manual, and external monitoring resistor will be required if these circuits are used.
Power Supply Connections
These circuits are provided on a single five-position plug-in barrier strip. Inputs are provided for two 24V
power supply circuits to drive the LSI-16(e). This facilitates standards compliance by providing a means of
redundant connections.
Each power supply must be capable of 24V DC at 15Watts. The Ground 1 and Ground 2 connections are
internally connected together and to system ground. The VRef connection may be used as a voltage
source for pull-ups on required fault inputs. This output is current limited at 100mA.
Loss of power to either power supply input will result in the LSI-16(e) detecting a fault. If standards
compliance is not required for an installation, a single power supply connection must be paralleled to the
two power supply inputs to avoid generating a fault signal.
