05701-A-0302 single-channel control card
3.5 Engineering Card
The System 57 engineering card provides full maintenance and set up facilities for each
channel card. The front panel has a series of tactile feedback push buttons that allows
checks of the alarm levels and performance to be carried out for each channel. A real-time
‘on board’ clock provides calibration history and calibration overdue reminder functions. An
access key provides security protection.
The engineering card can be fitted with optional modules for extended system options.
3.5.1 Serial Communications Module
The serial communications module provides a gateway between the System 57 rack and a
remote device (DCS, PLC or SCADA package) to allow the continuous monitoring of each
channel’s operation and condition as well as allowing remote configuration of the system
operation. The module uses the industry standard MODBUS RTU protocol, RS485/422/232
standard. Custom designed SCADA graphics packages are also available.
3.5.2 RS232 Printer Driver Module
The printer driver module provides a serial output in the event of a gas alarm, fault or user
intervention. The output is RS232 ASCII event data, has selectable print criteria, provides
time and date stamping and is electrically isolated.
3.5.3 Master Alarm Update Module
The alarm update module provides a common alarm indication with new alarm event update.
It also provides 2 Outputs: 1 relay, 1 Darlington, with selectable operation: pulsed or
continuous and an alarm and common alarm reset input. It complies with ISA ‘M’, DIN 19
235. It can be used with the optional master alarm update panel.
3.6 Interface Cards
There are 9 versions of interface card available (5 for 5701 Gas, 2 for 5704 Gas and 2 for
5704 Fire Control Cards). The interface cards provide the link between the various fire or
gas detectors and the control cards. They provide detector interface, offer flexible relay
options, and allow an individual control card power option. A high integrity relay operation
version is also available. The terminals accept ≤ 2.5mm2 (14AWG) gauge cable.
3.7 Rack Assemblies
System 57 racking units provide mounting options for the system 57 control cards and
interface cards. The racks are available complete with a DC input card and an engineering
card. The racks are 3U high, with front or rear wiring options. Half and full 19″ versions are
available accommodating up to a maximum of 64 channels of gas detection or 60 channels
of fire detection in a single rack, or a combination of both.
3.8 Cabinet Assemblies
The System 57 cabinets provide a convenient and compact mounting of the rack assemblies
and PSUs. They are wall mounting and available in half and full 19″ versions. The cabinets
have an IP54/Nema 12 ingress protection rating, pre-formed bottom-entry knock-out gland
entries and an accessory mounting plate.
3.9 DC Input Card
The DC input card is connected directly to the engineering card and provides the connection
point for power supplied to the whole rack. The field wiring from the engineering card is also
on this card. It provides a common power supply wiring point, reverse polarity and short
circuit protection and multi-supply input capability.
6 Detector Installation
Cabinet outline dimensions
Always install the detectors in accordance with the Detector Operating Instructions. In
general, detectors for lighter than air gasses should be located at a high level and detectors
for heavier than air gasses should be located at a low level.
Do not install the detectors:
a. Where the normal air flow may be impeded.
b. In corners of rooms where static air pockets may exist.
c. Near sources of heat such as convector heaters.
Do install the detectors:
a. As close as possible to the potential source of gas to be detected in order to give the
maximum possible warning.
b. So that they are accessible for maintenance work.