Detcon RD-64X-N7 - Manual (Page 5)

RD-64X Operators Manual
1. Introduction
1.1 Description
The RD-64X remote display is a multi-channel gas detection system designed to serve as a read only
monitor for a gas detection controller. It is configurable for up to 64 channels and interfaces with
Modbus™ RS-485 control systems. The RD-64X remote display utilizes a non-intrusive magnetic
interface and displays real time channel information on a backlit LCD. Display information includes the
channel number, gas concentration, device tag (gas type) and alarm/fault status. Each channel provides
three alarm levels (Alarm 1, Alarm 2 and Alarm 3) and fault for which the present status can be shown via
the front panel LED indicators. Additional features include Alarm Reset, Alarm Silence (Acknowledge)
and two banks of four local alarm outputs each. External alarm relays can also be added using Detcon’s
RL-4 relay modules, up to two each per bank.
The RD-64X is available in a choice of two enclosures. The first enclosure type is the Model RD-64X-
N4X which is housed in a NEMA 4X water proof enclosure and has a built in power supply that takes in
110/220VAC and outputs 24VDC. External DC power (11.5-30VDC) can also be provided by the
customer to power the remote display if AC power is not available or desired. This unit provides a DIN rail
which is used to mount the power supply and terminal blocks. If external alarm relays are used, Detcon’s
RL-4 relay modules are required and will need to be mounted in a separate enclosure.
The second enclosure type is the Model RD-64X-N7 which is housed in a NEMA 7 explosion proof
enclosure. Due to this enclosure type, the unit’s internal space is limited and cannot support a built in
power supply or DIN rail. The unit will need to be powered externally by 11.5-30VDC. AC power (90-
264VAC) can also be used to power the remote display by using Detcon’s optional AC/DC converter
module. If external alarm relays are used, Detcon’s RL-4 relay modules are required and will need to be
mounted in a separate enclosure.
1.2 System Operation
The heart of the RD-64X is the non-intrusive magnetic interface with backlit LCD display. The display
receives real time data from gas detection controllers using RS-485 Modbus™ RTU protocol. The RD-
64X includes a primary Modbus™ interface (COMM1 Master) used to receive concentration and status
directly from the Modbus™ capable controller (Slave) being monitored. A secondary Modbus™ interface
(COMM2 Slave) is also available which is used for communication with another remote display where the
RD-64X is seen as a slave device.
Alarm values and fault conditions can be configured to cause an assigned relay output to fire, thus
triggering external alarm devices. As gas alarm or fault conditions clear, the assigned relay outputs return
to their normal states. Relays can be set-up as Energized/De-Energized, Latching/Non-Latching and
Silenceable/Non-Silenceable. The RD-64X remote display also allows for wiring of an external manual
switch to act as an Acknowledge/Reset switch.
NOTE: The set-up configuration is fully field-configurable and can be executed by the user in
the field. Refer to section 7 System Operation and Configuration. Modifications to the set-up
configuration are expected to take place at the customer’s site due to requirement changes
and/or system expansions.
Model RD-64X Operators Manual Rev. 0.1 Page 1 of 30