Detcon RD-8X User Manual

Model RD-8X

Remote Display Unit

Model RD-8X-N4X

Remote Display

ALM1 ALM2 ALM3 FAULT

PROG ENTER

RESET/ACK

Operator’s Installation and Instruction Manual

The Woodlands, Texas 77387

Ph.281.367.4100 / Fax [phone]

November 25, 2009 • Document # 3434 • Revision 1.0

DETCON, Inc.

3200 Research Forest Dr.,

www.detcon.com

RD-8X-N4X Operators Manual

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Shipping Address: 3200 A-1 Research Forest Dr., The Woodlands Texas 77381

one: 888.367.4286, 281.367.4100 • Fax: [phone] • www.detcon.com

Ph

Model RD-8X-N4X Operator Manual Rev. 1.0 ii

Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067

• [e-mail]

RD-8X-N4X Operators Manual

Table of Contents

Description..............................................................................................................................................1

1.

2. Specifications..........................................................................................................................................1

3. Installation..............................................................................................................................................1

3.1 Mounting and Cable Penetrations................................................................................................................... 1

3.2 Power and I/O Connections............................................................................................................................ 2

3.2.1 AC Power.................................................................................................................................2

3.2.2 DC Power ................................................................................................................................2

3.2.3 Serial Input Connection...........................................................................................................2

3.2.4 Relay Outputs...........................................................................................................................4

3.3 Start-up ........................................................................................................................................................... 4

4. System Operation...................................................................................................................................4

4.1 Front Panel ..................................................................................................................................................... 4

4.2 Unit Setup Main Menu ................................................................................................................................... 5

4.2.1 Set Number of Channels ..........................................................................................................5

4.2.2 Setup Channel Data.................................................................................................................6

4.2.3 Calibration Mode.....................................................................................................................7

4.3 Remote Display Setup .................................................................................................................................... 7

4.4 Display Contrast........................................................................................................................................... 10

4.5 Reset Switch................................................................................................................................................. 10

5. Modbus Communications ...................................................................................................................10

6. Warranty ..............................................................................................................................................11

Appendix A................................................................................................................................................... 12

Revision History........................................................................................................................................................ 12

Appendix B...................................................................................................................................................13

Drawings and Diagrams ............................................................................................................................................ 13

Table of Figures

Figure 1 Dimensional Overview...................................................................................................................... 2

Figure 2 Wiring Diagram.................................................................................................................................3

Figure 3 Controller PCB Connections.............................................................................................................3

Figure 4 Front Panel ........................................................................................................................................5

Model RD-8X-N4X Operator Manual Rev. 1.0 iii

RD-8X-N4X Operators Manual

This page left intentionally blank

Shipping Address: 3200 A-1 Research Forest Dr., The Woodlands Texas 77381

Phone: [phone] • Fax: [phone] • Hwww.detcon.com

Model RD-8X-N4X Operator Manual Rev. 1.0 iv

Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067

H • [e-mail]

RD-8X-N4X Operators Manual

1. Description

The Model RD-8X is a read only remote display unit designed to operate with Modbus™ RS485 sensors or
control systems from Detcon. The unit displays real time channel information on the backlit LCD. Display
information includes the channel number, the gas type, and the gas concentration. The unit will also
display the current Alarm/Fault status via the front panel LED indicators.

Housed in a NEMA 4 water proof enclosure, the Model RD-8X has a built in power supply, providing
multiple power options. 115/230VAC 50/60Hz or 11.5-30VDC can provide power to the unit.

2. Specifications

Capacity

16 Input Channels

Sensor Inputs

Accuracy

Outputs

Electrical

Power Input

Power Consumption

Display

Electrical Classification

Dimensions

Physical

Operating Temperature Range

Warranty

3. Installation

RS-485 Modbus RTU From Control Systems

± 1% Full Scale Range

Qty 4 Relays: 1 Form C Contacts per relay
Rated for 5A @ 30VDC, 5A @ 250VAC
RS-485 Modbus™ Slave

115-230VAC 50/60Hz

11.5-30VDC

Nominal: 1 Watts @ 24VDC
Maximum: 2 Watts @ 24VDC

1”x5” Backlit LCD

NEMA 4X

15-3/8”W x 12-3/8”H x 8-1/2”D

-40F to +167F

-40C to +75C

One year

3.1 Mounting and Cable Penetrations

Securely mount the Model RD-8X enclosure per the mounting dimensions provided in Figure 1.

NOTE: AC power should be kept separate from DC power and signals within conduit runs.

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RD-8X-N4X Operators Manual

RESET

Model RD-8X-N4X

Remote Display

9.85"8.95"

ON/OFF

8"

11.75"
Mounting Flange

Mounting Flange

6.45"

6.85"

Figure 1 Dimensional Overview

3.2 Power and I/O Connections

Power and I/O connections are made on back of the PCB. Plug-in male connectors are provided for input
wiring terminations. This connector style provides for quick disconnect convenience during replacement or
servicing (refer to Figure 3).

3.2.1 AC Power

Connect the 115 or 230VAC input wiring to the terminals at P1labeled “VAC IN” (refer to Figure 3).

3.2.2 DC Power

For optional DC power input, connect 11.5-30VDC to the terminals at P2, labeled “VDC IN” (refer to
Figure 3). This input can be used for primary power or back-up power in the event of a VAC power
failure.

3.2.3 Serial Input Connection

The serial RS-485 connection to sensors or control systems should be terminated at P4 Labeled “COM2”
the RS-485 Master port of the remote display (refer to Figure 3).

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RD-8X-N4X Operators Manual

Power Switch

12

SW2

34

FAULT ALARM3 ALARM2 ALARM1

NC NO NC NO NC NO

NC NO

P9 P8 P7 P6

CONTROLLER PCA

RESET

P5

Yel 18AWG

Yel 18AWG

Figure 2 Wiring Diagram

P10

P1

P11

P2

P5

P5

RESET SWITCH

SW1

12

ACV IN

VDC IN

COM 1COM 2

Ground
Neutral (L2)
120VAC (L1)

VDC - (Return)
VDC + (11.5~30VDC)

Customer

Supplied

Wiring

RS-485 Shield
RS-485 - B
RS-485 - A

Customer

Supplied

Wiring

E

L2

L1

+

S

B

A

S

B

A

Figure 3 Controller PCB Connections

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RD-8X-N4X Operators Manual

3.2.4 Relay Outputs

The Model RD-8X provides four single pole double throw (SPDT) Form C contact relays. The relay
terminals (P6 through P9) are labeled “FAULT”, “ALM3”, “ALM2”, and “ALM1” (refer to Figure 3). The
relays can be used to control annunciating devices or as signal input/outputs to other control devices.
Connections are labeled COM (common), NO (normally open) and NC (normally closed). The current
ratings of the relay contacts are 5A @ 30VDC, and 5A @ 250VAC, these ratings should not be exceeded.

Note: ALM3 is not used when the unit is used with the 10B control units.

3.3 Start-up

The power switch is located on the outside of the enclosure, on the right side of the unit, and is marked as
“ON” and “OFF”. To apply power to the unit, turn the switch to the “ON” position.

NOTE: Before applying power, check to make sure that all the wiring connections and external
devices are installed correctly.

NOTE: Applying power with devices hooked up incorrectly may cause damage to the equipment.

When power is applied to the unit, the unit will display the firmware revision and properties for several
seconds. For this controller that information should be:

DETCON INC COM 1 MODBUS SLAVE
MODBUS CONTROLLER
VERSION XX.XXX COM 2 MODBUS MASTER
PCWH X.XXX

After unit initialization, the unit will begin normal operation. If the unit has been properly setup, the unit
will display the current status of the devices that it is connected to.

4. System Operation

4.1 Front Panel

The Main Display is a 1¼”x 6” backlit LCD that has 4 lines by 40 characters. In normal operation the
channel’s information will be shown as “01> XXXX ppm GAS” will be displayed. If any channel is in
any gas alarm condition, “01> XXXX IN ALARM ” will be displayed. If any gas channels are in Fault,
they will display “01> XXXX IN FAULT ”. If any channels are not communicating with their
appropriate 12B controller, then they will display as “01> XXXX COMM ERROR ”.

Four LED indicators on the front panel show alarm and fault relay status. The LED’s represent ALM 1
(yellow), ALM 2 (amber), ALM 3 (red) and FAULT (blue) and are labeled respectively.

The RD-8X user interface consists of four function keys on the front panel. These keys are labeled:
“PROG”, “u” (Up Arrow), “v” (Down Arrow), and “ENTER”. The “ENTER” key doubles as a
“RESET/ACK” key, but “RESET/ACK” has no functionality in this firmware revision.

NOTE: The Remote Display automatically times out of Menu Mode and returns to the Main
Display after 15 seconds of inactivity. While in Menu Mode, there are no updates to gas readings.

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