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DVP-120B
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User Manual
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Macurco DVP-120B User Manual

Macurco DVP-120B
Detection and Ventilation Control Panel User Instructions
IMPORTANT: Keep these User Instruc tions for reference.
Table of Contents
1 General Safety Information .......................................................................................................................................................... 4
1.1 List of warnings ..................................................................................................................................................................... 4
2 Use Instructions and Limitations .................................................................................................................................................. 5
2.1 DVP-120B General Description ............................................................................................................................................ 5
2.2 DVP-485B Modbus
2.3 MRS-485 Modbus Adapter ................................................................................................................................................... 5
2.4 Features ............................................................................................................................................................................... 6
2.5 Specifications........................................................................................................................................................................ 6
3 Installation and Operating Instructions ......................................................................................................................................... 7
3.1 Mounting Holes ..................................................................................................................................................................... 7
3.2 General Wiring Information ................................................................................................................................................... 8
3.2.1 DVP-120 ..................................................................................................................................................... 8
3.2.2 DVP-120B ................................................................................................................................................... 8
3.3 Main Power Connection ........................................................................................................................................................ 9
3.4 Remote Sensor Connection .................................................................................................................................................. 9
3.4.1 DVP-120 ..................................................................................................................................................... 9
3.4.2 DVP-120B ................................................................................................................................................. 11
3.5 Interfacing Macurco Sensors .............................................................................................................................................. 13
3.5.1 DVP-120 ................................................................................................................................................... 13
3.5.2 DVP-120B ................................................................................................................................................. 13
4 Operations ................................................................................................................................................................................. 18
4.1 Initial Operating Mode ......................................................................................................................................................... 18
4.1.1 Status Light Display .................................................................................................................................. 18
4.1.2 User Interface ........................................................................................................................................... 19
4.1.3 Cursor Keys .............................................................................................................................................. 19
4.1.4 MENU Key ................................................................................................................................................ 19
4.1.5 HUSH Key ................................................................................................................................................. 19
4.1.6 Normal Status Display .............................................................................................................................. 20
4.1.7 ALARM Status Display .............................................................................................................................. 20
4.1.8 Warning Status Display ............................................................................................................................. 21
4.1.9 Trouble Status Display .............................................................................................................................. 21
4.2 Ventilation Control .............................................................................................................................................................. 22
4.2.1 Zone Signal Display .................................................................................................................................. 22
4.3 Setting the System Configuration ....................................................................................................................................... 23
4.3.1 System Menu ............................................................................................................................................ 23
4.3.2 Configure System Submenu ..................................................................................................................... 24
4.3.3 Configure Sensors Submenu .................................................................................................................... 29
4.3.4 Configure Relays, Horn & Strobe Submenu ............................................................................................. 31
4.3.5 Configure Horn Submenu ......................................................................................................................... 32
4.3.6 Configure Strobe Submenu....................................................................................................................... 33
4.3.7 Configure Zones Submenu ....................................................................................................................... 33
4.3.8 Configure Signals Submenu ..................................................................................................................... 37
5 BACnet ...................................................................................................................................................................................... 41
5.1 General Information ............................................................................................................................................................ 41
5.1.1 Analog Input - Sensor ID ........................................................................................................................... 41
5.1.2 Analog Input - Gas Reading ...................................................................................................................... 41
5.1.3 Binary Input - MRS Trouble....................................................................................................................... 41
5.1.4 Binary Input - Over Range ........................................................................................................................ 41
5.1.5 Binary Input – Trouble ............................................................................................................................... 41
5.1.6 Binary Input- DVP Com Error .................................................................................................................... 41
5.2 Macurco Network Parameter Utility (NPU) ......................................................................................................................... 41
5.3 BACnet Connection ............................................................................................................................................................ 43
5.3.1 Serial RS-485 to USB Wiring .................................................................................................................... 43
5.3.2 Serial RS-485 to Ethernet (TCP/IP) .......................................................................................................... 44
®
Adapter ................................................................................................................................................ 5
5.4 BACnet software ................................................................................................................................................................. 44
6 Troubleshooting ......................................................................................................................................................................... 45
6.1 System Status Light Flashing ............................................................................................................................................. 45
6.1.1 Input Channel Trouble .............................................................................................................................. 45
6.1.2 Internal Controller Board Trouble .............................................................................................................. 46
6.2 Timed ventilation problem ................................................................................................................................................... 46
6.3 No Power ............................................................................................................................................................................ 46
6.4 LCD Display unreadable ..................................................................................................................................................... 46
6.5 The Keypad does not respond (LCD shows KEYS LOCKED) ............................................................................................ 46
6.6 The Keypad does not respond after silencing an Alarm, Warning or Trouble. .................................................................... 47
6.7 After a power failure ............................................................................................................................................................ 47
6.8 MRS-485 Modbus Application ............................................................................................................................................ 47
6.8.1 Normal Operation ...................................................................................................................................... 47
6.8.2 Unknown Sensor Code ............................................................................................................................. 47
6.8.3 Error Codes ............................................................................................................................................... 47
6.8.4 Dip Switch Settings Codes ........................................................................................................................ 47
7 Testing and Maintenance ........................................................................................................................................................... 49
7.1 Testing ................................................................................................................................................................................ 49
7.1.1 Keypad Test .............................................................................................................................................. 49
7.1.2 DVP Functionality Test ............................................................................................................................. 49
7.2 Maintenance ....................................................................................................................................................................... 49
8 Appendix A – Quick Setup ......................................................................................................................................................... 50
8.1 Configure System Submenu ............................................................................................................................................... 52
8.2 Configure Sensors Submenu .............................................................................................................................................. 54
8.2.1 See section 4.1 Initial Operating Mode for more detail ............................................................................. 54
8.2.2 See section 4.1.2 User Interface for more detail ....................................................................................... 54
8.2.3 See section 4.3 Setting the System Configuration for more detail ............................................................ 54
8.2.4 See section 4.3.3 Configure Sensors Submenu for more detail ............................................................... 54
8.3 Configure Relays, Horn & Strobe Submenu ....................................................................................................................... 55
8.3.1 See section 4.3.4 Configure Relays, Horn & Strobe Submenu for more detail ......................................... 55
8.4 Configure Zones Submenu ................................................................................................................................................. 56
8.4.1 See section 4.3.7 Configure Zones Submenu for more detail ................................................................... 56
8.5 Configure Signals Submenu ............................................................................................................................................... 58
8.5.1 See section 4.3.8 Configure Signals Submenu for more detail ................................................................. 58
9 Appendix B – DVP-120 Setup Record ....................................................................................................................................... 59
10 Appendix C – DVP-120B Setup Record .................................................................................................................................... 60
11 Macurco Gas Detection products limited warranty ..................................................................................................................... 62
Technical Support Contact Information ............................................................................................................................................. 62
General Contact Information ............................................................................................................................................................. 62

1 General Safety Information

WARNING

1.1 List of warnings

• Each person using this equipment must read and understand the information in these User Instructions before use. Use of this equipment by untrained or unqualified persons or use that is not in accordance with these User Instructions, may adversely affect product performance and result in serious injury or death.
• This equipment helps monitor for the presence and concentration level of certain specified airborne gases. Misuse may produce an inaccurate reading, which means that higher levels of the gas being monitored may be present and could result in overexposure and result in serious injury or death. For proper use, see supervisor or User Instructions, or call Macurco Technical Service at 1-844-325-3050.
• DVP-120B may not function effectively below 32°F (0°C) or above 104°F (40°C). Using the equipment outside of this temperature range may adversely affect product performance and result in serious injury or death.
• High voltage terminals (120/240 VAC) are located within the DVP-120B, presenting a hazard to service technicians. Only qualified technicians should open the DVP-120B case and service the internal circuits. Ensure power is removed from the DVP-120B prior to servicing the unit.
• Immediately exit any environment that causes an alarm condition on the sensor. Failure to do so may result in serious injury or death.
• Each time the unit is turned on it performs a self-test, which activates the audible and visual alarms. If the self-test fails, or all the alarms do not activate, do not use. Failure to do so may adversely affect product performance and result in serious injury or death.
• Do not cover or obstruct audible alarm opening or visual alarm LED. Doing so may adversely affect product performance and result in serious injury or death.
• Do not disassemble unit or attempt to repair or modify any component of this instrument. This instrument contains no user serviceable parts, and substitution of components may adversely affect product performance and result in serious injury or death.
• Use only for monitoring the gases which the sensors and equipment are designed to monitor. Failure to do so may result in exposures to gases not detectable and result in serious injury or death. For proper use, see supervisor or User Instructions, or call Macurco Technical Support at 1-844-325-3050.

2 Use Instructions and Limitations

WARNING

2.1 DVP-120B General Description

The DVP-120B exhaust fan controller, use in conjunction with Macurco gas detector, controller, transducers, provides automatic controls to help maintain an acceptable environment in parking garages or other facilities. The DVP-120B system is designed to meet specifications for safety in enclosed parking garages, including the Uniform Building Code and OSHA 50ppm CO requirements. The standard DVP-120B can control up to twelve analog gas sensors, as well as 87 digital addressable sensors, in any combination (i.e. CO, NO

2.2 DVP-485B Modbus® Adapter

The DVP-485B Modbus adapt er increa ses the capa city of th e DVP-120B from 12 detectors to 99 and provides a RS-485 BACnet output. The DVP-120B is the Modbus and BA Cnet enabled versi on o f the D VP -120 with up to 87 Modbus addr essable s ensor s on one channel, plus the original 12 analog 4-20mA sensor channels. System wiring includes 4-20mA current loop and RS-485 serial detector interface as well as main power connect ion for the DVP-120B, the fan control and alarm connections from the DVP-120B to the building ventilation and automation systems. The RS-485 serial int erface is from the DVP-120B to the remote detector s. Power to these detectors is provided by an external 24VDC low voltage power supply. See section 3.4 Remote Sensor Connection for more information regarding remote power supplies.

2.3 MRS-485 Modbus Adapter

The Macurco MRS-485 adapter is an accessory used to convert the 4-20mA analog signal from Macurco 6-Series type detectors to a digital signal for use with the DVP-120B and other mul tipo int addres sable syst ems . The Ma curco MRS -485 simp ly plugs i nto the bac k of the detector and a single screw fastens it in place. The MRS-485 accepts the 4-20mA output and is powered from the same connection as the detector. The MRS-485 mounts to a Macurco 6-Series detector installed on a 4” x 4” electrical box electrical box supplied by the contractor.
, EX, etc.). The DVP-120B is ready for operation after the wiring is complete and the user system configuration is entered.
2
Each person using this equip ment must rea d and und erstand the inf ormation in the se User I nstructions befor e use. Use of this equipment by untrained or unqualified persons or use that is not in accordance with these User Instructions, may adversely affect product performance and result in serious injury or death.

2.4 Features

• LCD display showing the status of each transducer and relay
• External keypad for user selection of the transducer/alarm display and setting the configuration (password
protected)
• Up to three ventilation control zones can be defined
• Each zone can be controlled based on transducer signals and/or time of day
• Each relay is configurable with a delay before activation and minimum on time
• Fail-safe operation can be implemented
• Lockable NEMA 1 type enclosure
• Modular input and output connectors
• One RS-485 digital input channels - 87 addressable sensors RS-485 digital output channel for BACnet
• Compatible with all Macurco 6-Series gas detectors and MRS-485 adapter
• Twelve analogs (current loop) input channels
• Three 10A, 240 VAC SPDT Dry Contact relays
• 24VDC Powered Relays for external Horn and Strobe
• ETL Listed to UL 508A, CAN/CSA-C22.2 No. 14-13
• BTL Listed

2.5 Specifications

• Size: 10.5” x 12.5” x 2.” (267 mm x 318 mm x 51 mm)
• Weight: 6 ½ lb (2.9 kg)
• Enclosure: NEMA 1 Type
• Operating Temperature: 32° to 104°F (0° to 40°C)
• Operating Humidity: 0% to 95% RH non-condensing
• Power Input: 90 – 250 VAC, 1 Amp, 47 – 63 Hz, single phase
• Relay Rating (3): SPDT, 120/240 VAC, 10 A resistive
• LCD Display: 2 rows of 16 characters with backlight
• Status Indicators (LED): Power, ALARM/warning, Hush, Relay 1, Relay 2 & Relay 3
• Audible indicator: Internal buzzer, 90 dBA at 1ft
• External Drivers (2): 24VDC, maximum 250 mA
• Carbon Monoxide (CO) Range: 0 – 200ppm
• Nitrogen Dioxide (NO
) Range: 0 – 20ppm
2
• Combustible (EX) Range: 0 – 50% LEL
• Ammonia (NH
• Hydrogen Sulfide (H
) Range: 0 – 100ppm
3
S) Range: 0 – 50ppm
2
• Refrigerant (REF) Range: 0 – 1,000ppm
• Oxygen (O
• Carbon Dioxide (CO
) Range: 0 – 25% v/v
2
) Range: 0 – 5,000ppm
2
• Wild Card (WC) Range: Variable
• Relay on Delay: 0 – 15 minutes in 1 second increments
• Relay Minimum Run Time: 0 – 15 minutes in 1 second increments

3 Installation and Operating Instructions

WARNING
WARNING
Gas detection and exhaust fan control are provide d by a M ac u rco DVP-120 system. System wiring includes the main power connection for the DVP-120, 4-20mA current loop and 24VDC power connections between the remote sensors and the DVP-120, the fan control connections and/or alarm connections from the DVP-120 to the building ventilation and automation syste ms. The DVP-120B also inclu des the RS-485 serial interface from the DVP-120B to the MRS-485 and remote detectors. Power to the MRS-485 and detectors is provided by isolated/remote low voltage power supply.
The system is configured by th e user throu gh th e LCD display and keypad. The sy ste m di s play pr ovides the user w ith the sy stem status and the status of each configured sensor. In addition, all control functions of the DVP-120 may be accessed through the system display and keypad.
This equipment helps monitor for the presence and concentration level of certain specified airborne gases. Misuse may produce an inaccurate reading, which means that higher levels of the gas being monitored may be present and could result in overexposure and result in serious injury or death. For proper use, see supe rvisor or U ser In struct ion s, or call Ma curc o Tec hnic al Serv ice at 1-844-325-
3050. This DVP-120 system should be used with Macurco™ transducers and each unit will measure the level of the target gas (i.e. CO, NO2,
EX, etc.) and provide this information to the DVP-120 over a 4-20mA current loop. The transducers operate on low voltage (24VDC). All power and signal connections for the transdu cers are pro vided from the D VP-120 control pa nel, via unshie lded four condu ctor cable. Fo r DVP-120B Modbus applications use shielded 3-conductor wire with one twisted pair providing a pair for signal (A & B), common (COM) and shield ground (SHD) connections. The DVP-120 control panel provides three relays which can be used for ventilation fan control or alarm signaling. These relays (SPDT - Form C) are for pilot duty only, capable of switching 10 amp loads up to 240 VAC. Main power wiring should conform to national and local electrical codes and may require separate inspections and certification. Contact your local building authority for further details.
DVP-120 may not function effectively below 32°F (0°C) or above 104°F (40°C). Using the equipment outside of this temperature range may adversely affect product performance and result in serious injury or death.

3.1 Mounting Holes

Mounting holes are provided in the DVP-120 case at the four corners. The top two are keyhole shaped so that the panel can be hung and then the two bottom screws driven to hold the panel. See figure 3-1. The panel should be mounted with sufficient space around the panel for access to Conduit entry holes provided on the top, bottom and right side of the panel.
Figure 3-1 Mounting Holes
WARNING

3.2 General Wiring Information

High voltage terminals (120/240 VAC) are located within the DVP-120, presenting a hazard to service technicians. Only qualified technicians should open the D VP-120 case and serv ice the internal circu its. Ensure power is r emoved from the DVP -120 prior to ser vicing the unit.
Figure 3-2 Typical Layout
With the exception of the safety ground, all field wiring is completed via modular connectors (provided). After wiring, simply plug the modular connectors into the matching connectors on the printed circuit board (PCB).
Note: It is recommended to always install with wires enclosed within the rigid metallic conduit.

3.2.1 DVP-120

The power and signal connections to the remotely mounted sensors should be size AWG18 (minimum) for short runs. Refer to Table 3­2 for recommended wire gauges. Four conductor cables may be used in all cases since the DVP-120 employs DC power for remote sensors to help prevent electrical noise from interfering with the sensor output signal.
Do not bundle sensor power and/or signal connections with other AC power cables to prevent electrical interference. If other AC power connections must be bundled with the DVP-120 sensor cables, the sensor connections should be made with two twisted pairs of the appropriate gauge, with an overall foil and braid shield. All shields should be terminated at the DVP-120 end of the cable only. A ground stud is provided near the bottom left corner of the panel.

3.2.2 DVP-120B

The power connections to the MRS-485 and remote mounted sensors and should be size AWG18 (minimum) for short runs. Refer to Table 3-2a for recommended wire gauges. The power for the MRS-485 adapter is connected via a two-terminal screw type connector, 12 to 24 VAC or 12 to 24 VDC and no polarity.
The MRS-485 adapter output is wired in the standard 2W-Modbus circuit definition with selectable built-in terminating resistors at the ends of the RS-485 bus. It is recommended to always use twisted wires to reduce noise and allow for reliable data communication over greater distances. For best performanc e use sh ielded 3-cond uctor wire w ith one twist ed pai r pr oviding a pair f or sign al (A & B), common (COM) and shield ground (SHD) connections. Use at least 3-conductor wire with one twisted pair providing a pair for signal (A & B) and common (COM) connections. The Macurco MRS-485 Modbus output is connected via a four-terminal screw type connector. Running the Modbus cable adjacent to or in the same conduit with high voltage wires is not recommended as there may be interference from the high voltages.
Signal
Connector
Pin Number
Line (120/220/240/ 2 50 VAC)
AC~ 3 Neutral
AC~ 1 Ground
Ground Stud
n/a

3.3 Main Power Connec ti on

The main power cable should be routed int o the bott om left c onduit entry. Ma curco re commend s a minimum w ire size of A WG18 and the wire insulator must be rated for 140°F (60°C) service. The modular connector will accept wire from 12 to 24 AWG. The safety ground wire should be secured to the ground stud at the bottom left of the cabinet with the lock washer and nut supplied. Use a ring terminal for the ground connection. Refer to Table 3-1 for DVP-120 power connections. The line and neutral wires should be stripped 1/4 in. (6.5 mm), insert the wire into the wire cavity of the modular connector and tighten the screw clamp. Ensure that the wire cannot be easily pulled from the connector. Plug the modular connector into AC~ on the PCB and ensure that it latches into the header properly.
Table 3-1 Main Power Connections
Figure 3-3 System Wiring Diagram

3.4 Remote Sensor Connection

3.4.1 DVP-120

Each remote sensor is connected by a four-wire connection – two wires for DC power and two wires for the 4 – 20 mA loop connection. The sensors are connected to the control panel PCB with modular connectors, two sensors per connector. See Figure 3-5 for a view of a typical sensor connector. Refer to Table 3-2 for wire size recommendations.
Wire gauge
Maximum Run Length
(feet)
(meters)
18
500
152
16
800
244
14
1250
381
Figure 3-4 DVP-120 Internal View and DVP-120B with DVP-485 Modbus Adapter
Figure 3-5 Sensor Interface Connector – Channels 5 and 6
Each 8-terminal sensor modular connector may be disconnected from the PCB connector to ease wire installation. The terminals will accept wire from 16 to 28 AWG. To install a wire, strip back approximately 0.25 in. (6 mm) of insulation and insert the bare wire into the terminal. Tighten the screw clamp and ensure that the wire cannot be easily pulled from the connector. Connector to sensor C1 through C12 correspondence to all 12 input channels.
Table 3-2 Recommended Wire Gauge
10
Typical coverage for CO, CO2 and NO2 sensors is 5,000 sq. ft. (464.5 sq. m), 900 sq. ft. (83.6 sq. m) for combustibles and other toxic gases (see the User Instructions for each sensor type for location and coverage details). Extra sensors may be needed near areas where people work, such as toll booths. Macurco provides only the control panels and sensors. Fans, relays, and other devices are provided by the contractor. See the appropriate building code for the size of fans and air changes per unit of time.

3.4.2 DVP-120B

A Modbus over Serial Line Cable should be shielded for best performance. The shield should be connected on each detector at SHD terminal and connected to a ground terminal or chassis only at one end of the bus. An RS485-MODBUS must use a balanced pair (for A-B) and a third wire (for the Common). For RS485-MODBUS, Wire Gauge must be chosen sufficiently wide to permit the maximum length (1000 m or 3281ft). AWG 24 is always sufficient for the MODBUS Data. Category 5 cables may operate for RS485-MODBUS, to a maximum length of 600 m 1968.5 ft. For the balanced pairs used in an RS485-system, wire with a characteristic impedance of higher than 100 Ohms may be preferred, especially for 19200 and higher baud rates.
Note: It is recommended to always use twisted wires to reduce noise and allow for reliable data communication over greater distances. Use at least 3-conductor wire with one twisted pair providing a pair for signal (A & B) and common (COM) connections.
For best performance use shielded 3-conductor wire with one twisted pair providing a pair for signal (A & B), common (COM) and shield ground (SHD) connections.
Figure 3-6 MRS-485 wiring
3.4.2.1 Topology
An RS485-MODBUS configuration w itho ut repeat er has on e trunk cab le, alo ng whic h devi ce s are con necte d, dire ctly (d aisy cha inin g) or by short derivation cables. The trunk cable, also named “Bus”, can be long. Its two ends must be connected on Line Terminations. (see Line Termination - End of Line Resistor section). The use of repeaters between sev eral RS 485-MODBUS is also possible.
3.4.2.2 Length
The end to end length of the trunk cable must be limited. The maximum length depends on the baud rate, the cable (Gauge, Capacitance or Characteristic Impedance), the number of loads on the daisy chain, and the network configuration (2-wire). For a maximum 9600 Baud Rate and AWG26 (or wider) gauge, the maximum length is 1000m 3281ft. The derivations must be short, never more than 20m 65.5ft. If a multi-port tap is used with n derivations, each one must respect a maximum length of 40m 131ft divided by n.
3.4.2.3 Grounding
The Common circuit (COM) must be connected directly to protective ground, preferably at one point only for the entire bus.
3.4.2.4 Power Wire
All field wiring is completed via modular connectors (provided). After wiring, simply plug the modular connectors into the matching connectors on the MRS-485. The power connections to t he remotely mounted detectors s hould be s ize AWG18 ( minimum) for short runs . Since Macurco detectors are rated for operation between 12 and 24 VDC or VAC, the voltage drop between the power supply and the MRS-485 should not be an issue if the recommended power wire gauge guidelines below are followed. The terminals will accept wire
11
from 16 to 28 AWG. To install a wire, strip back approximately 0.25 in. (6 mm) of insulation and insert the bare wire into the terminal.
Wire gauge
Maximum Run Length
(feet)
(meters)
18
263
80
16
418
127
14
665
203
12
1058
322
Tighten the screw clamp and ensure that the wire cannot be easily pulled from the connector.
3.4.2.5 Power Supply
Selection of a UL recognized NEC Class 2 power supply which can power 12 MRS-485 connected to 6-Series detectors.
• MRS-485 is rated 3.25W with a detector connected.
• The minimum power which the power supply needs to deliver is 12 detectors x 3.25 W/detector = 39W
So, a 24VDC, 60W power supply will work.
Table 3-2a Wire selection for a 60W power supply
3.4.2.6 Relay Connection
All poles of the three relays are available at the modular connector R1 R2 R3 (see Figure 2 for details). R1 R2 R3 is a 9-position variant of the high voltage modular connector used for power input. Each terminal can accommodate a wire size from 12 to 24 AWG.
Figure 3-7 Relay Connector
To install the wiring for the relays, disconnect the connector from the header on the PCB. Strip the insulation off each wire back approximately 1/4 in. (6.5 mm), insert the bare wire into the terminal and tighten the screw clamp. Ensure that the wire cannot easily be pulled from the connector.
3.4.2.7 Horn & Strobe Connection
The external horn and strobe connections are available at the modular connector S H (see Figure 2 for details). S H as a 4-position connector, similar to the sensor interface connectors.
12
Maximum Run Length
(feet)
(meters)
24
200
61
22
340
103
20
480
147
18
850
215
WARNING
Figure 3-8 Horn & Strobe Connector
To install the wiring for the horn or strobe, disconnect the connector from the header on the PCB. Strip the insulation off each wire back approximately 0.25 in. (6 mm), insert the bare wire into the terminal and tighten the screw clamp. Ensure that the wire cannot eas ily be pulled from the connector. When all wire s are connected, sea t the modular connector into the PCB header; ensur e that the latch engage s. Refer to Table 2 3 for recommended wire gauge vs. run length for the horn & strobe functions (maximum 2.5-volt drop in the wire). The Strobe and Horn circuits are Class 2 control circuits, so Class 2 conductors should be used.
Wire gauge
Table 3-3 Wire gauge for Horn & Strobe functions
Immediately exit any environm ent that cau ses an a larm cond i tion on the sen sor. Fa ilure to d o so may re sult in serious inj ur y or death.

3.5 Interfacing Macurco Sensors

3.5.1 DVP-120

Macurco sensors with current loop outputs may be used with the DVP-120. See http://www.macurco.com Macurco gas transducers. See specific information on other manufacturer’s transducers.
Power connections to Macurco sensors used with the DVP-120 are polarity-insensitive (no polarity) since a bridge rectifier is connected to the power input terminals. All sensors used with the DVP-120 panel employ screw clamp terminal blocks for power and signal connections. The polarity of the current loop connections is marked on the printed circuit b oard of the sensor.

3.5.2 DVP-120B

The Macurco MRS-485 Adapter converts the Macurco 6-S er ies 4-20mA analog output to a digital output for use with the DVP-120B and other addressable network systems
13
for information on compatible
1. Remove the 4-20mA/Power plug from the Macurco 6-Series gas detector
2. Plug the MRS-485 adapter into the empty socket.
3. Install the provided MRS-485 screw.
4. See the wiring diagram for wire connection.
Figure 3-9 MRS-485 Installation
3.5.2.1 Connection
The Macurco MRS-485 output is connected via a four -termina l screw t ype conne ctor. The MR S-485 adapter is wired in the standard 2W ­Modbus circuit definition wi th s electable buil t-in t ermin ating re sistor s at the end s of the RS-4 85 bu s. The pow er for t h e MR S-4 85 ada pte r is connected via a two-terminal screw type connector, 12 to 24 VAC or 12 to 24 VDC and no polarity.
Note: Running the Modbus cable adjacent to or in the same conduit with high voltage wires is not recommended as there may be interference from the high voltages.
Figure 3-10 Modbus Wiring
14
3.5.2.2 Line Termination - End of Line Resistor
The MRS-485 and DVP-485B adapters are wired in the standard 2W-Mo dbus circuit definitio n with selectable bui lt-in terminat ing resistors at the ends of the RS-485 bus. The MRS-485 and DVP-485B adapters provide integral termination for the end of line resistors (EOL). The terminations use 4-pin connector (for MRS-485) and 3-pin (for DVP-485B) with a jumper to select termination: The user selects no termination or one of the two Modbus line termination options. The MRS-485 has two line termination options provided and DVP-485B adapters have 120-ohm termination options provided onboard.
Figure 3-11 End of Line Resistor
Place the EOL jumper on one of the following positions:
3.5.2.3 Determining EOL Use
At the baud rate of 19200 (default baud rate for Macurco MRS-485 and D VP-485) and with cables less th an 1,000 ft. in length, terminat ion resistors are not recommended.
At the baud rate of 19200 and with cables longer than 1,000 ft., termination resistors are recommended. It is recommended to use an RS-485 type of cable and 120 ohms for termination resistor.
An RS-485 network requires a 3-wire cable: a twisted pair and a third wire. It is difficult to tell whether shielding is required or not in a particular system until problems arise, so it is recommended to always use shielded cable.
When using termination resistors use only 2 resistors, one at each end of the RS-485 transmission line (i.e. 1 at the DVP-485B and 1 at the last/farthest MRS-485).
3.5.2.4 Using Other Baud Rates
For any other baud rates calculate when (at what length) termination resistors are required. Calculate the length as 1000 ft. divided by the ratio between the new baud rate and 19200.
For example, if new baud rate is 9600 1000 / (9600/19200) = 1000 / 0.5 = 2000 (ft.) Use termination resistors when cables are longer than 2000 ft.
For example, if new baud rate is 38400 1000 / (38400/19200) = 1000 / 2 = 500 (ft.) Use termination resistors when cables are longer than 500 ft.
Note: Other manufacturers may have different recommendations on wire length and EOL resistor usage.
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Figure 3-12
At 19200 baud rate (default), 1000 ft or less and using RS-485 or Cat-5 type cable
Figure 3-13
At 19200 baud rate (default), more than 1000 ft and using RS-485 type cable
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3.5.2.5 DIP Switches and Addressing
Each MRS-485 (and the partner gas detector) must be configured to a unique address. If there are 10 detectors on the serial lin e, t hen 10 unique addresses must be used, one for each detector. To set the address, use the eight DIP switch positions. For each unit choose the value from 13 to 99 (see chart) and set the eight switches to match the address. UP means ON or 1 and DOWN means OFF or 0. For example, to configure a unit as address “50”, set switches “2, 5, 6” (see table) to ON or in the up position (01001100). See page 11 for a list of applicable addresses and dip-switch settings.
13 = 1, 3, 4 14 = 2, 3, 4 15 = 1, 2, 3, 4 16 = 5 17 = 1, 5 18 = 2, 5 19 = 1, 2, 5 20 = 3, 5 21 = 1, 3, 5 22 = 2, 3, 5 23 = 1, 2, 3, 5 24 = 4, 5 25 = 1, 4, 5 26 = 2, 4, 5 27 = 1, 2, 4, 5 28 = 3, 4, 5 29 = 1, 3, 4, 5
30 = 2, 3, 4, 5 31 = 1, 2, 3, 4, 5 32 = 6 33 = 1, 6 34 = 2, 6 35 = 1, 2, 6 36 = 3, 6 37 = 1, 3, 6 38 = 2, 3, 6 39 = 1, 2, 3, 6 40 = 4, 6 41 = 1, 4, 6 42 = 2, 4, 6 43 = 1, 2, 4, 6 44 = 3, 4, 6, 45 = 1, 3, 4, 6 46 = 2, 3, 4, 6
47 = 1, 2, 3, 4, 6 48 = 5, 6 49 = 1, 5, 6 50 = 2, 5, 6 51 = 1, 2, 5, 6 52 = 3, 5, 6 53 = 1, 3, 5, 6 54 = 2, 3, 5, 6 55 = 1, 2, 3, 5, 6 56 = 4, 5, 6 57 = 1, 4, 5, 6 58 = 2, 4, 5, 6 59 = 1, 2, 4, 5, 6 60 = 3, 4, 5, 6 61 = 1, 3, 4, 5, 6 62 = 2, 3, 4, 5, 6 63 = 1, 2, 3, 4, 5, 6
64 = 7 65 = 1, 7 66 = 2, 7 67 = 1, 2, 7 68 = 3, 7 69 = 1, 3, 7 70 = 2, 3, 7 71 = 1, 2, 3, 7 72 = 4, 7 73 = 1, 4, 7 74 = 2, 4, 7 75 = 1, 2, 4, 7 76 = 3, 4, 7 77 = 1, 3, 4, 7 78 = 2, 3, 4, 7 79 = 1, 3, 4, 7 80 = 5, 7
83 = 1, 2, 5, 7 84 = 3, 5, 7 85 = 1, 3, 5, 7 86 = 2, 3, 5, 7 87 = 1, 2, 3, 5, 7 88 = 4, 5, 7 89 = 1, 4, 5, 7 90 = 2, 4, 5, 7 91 = 1, 2, 4, 5, 7 92 = 3, 4, 5, 7 93 = 1, 3, 4, 5, 7 94 = 2, 3, 4, 5, 7 95 = 1, 2, 3, 4, 5, 7 96 = 6, 7 97 = 1, 6, 7 98 = 2, 6, 7 99 = 1, 2, 6, 7
3.5.2.6 Normal MRS-485 Operation
The MRS-485 will monitor the 4-20 mA current output of the detector. At power up and during its warm-up period, the 6-Series detector will communicate its sensor type over the 4-20 current output using a custom protocol. The MRS-485 will automatically register each 6­Series detector as it is programmed with information about all the detectors to which it can be connected. The MRS-485 will use this information to determine the gas level sensed by the 6-Series detector by measuring the 4-20 mA current-loop output during normal operation of the detector.
• When the LED is solid GREEN, the operation is normal, the MRS-485 knows the detector type, no errors are detected and no MODBUS data are being received or transmitted over the RS-485 line.
• When the LED is GREEN with random bursts of AMBER, the operation is normal and now data are being received or transmitted over the RS-485 line. The AMBER LED will come on anytime that there is data traffic
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4 Operations

D V P - 1 2 0 V e r 1 . 0 7
WARNING
D V P - 1 2 0 V e r . 1 . 0 7 W a r m - u p 2 : 3 0

4.1 Initial Operating Mode

When power is first applied to the DVP-120, a few simple self-tests will be performed, and the system will cycle through all status lights, and display the system model and firmware version number (Figure 4-1). The system will then proceed to normal mode if the operating parameters have been entered.
Figure 4-1 Model Display
Each time the unit is turned on it performs a self-test, which activates the audible and visual alarms . If the self-test fails, or all the alarms do not activate, do not use. Failure to do so may adversely affect product performance and result in serious injury or death.
If the user has not entered any parameters, the system WILL NOT be controlling the ventilation system. The relays WILL NOT actuate, and the horn and strobe outputs WILL NOT be powered. The power status light will show NORMAL (steady green) and the system will immediately enter the CONFIGURATION mode, see section 4.2 for details to set the configuration parameters.
If a valid set of configuration parameters have been entered, the panel will wait for all sensors to warm up. During this time, the display will show a count-down, minutes and seconds, until the end of the warm-up period, (Figure 4-2).
Figure 4-2 Warm=Up display
During the warm-up period, the keypad will be locked. When the warm-up period ends, the LCD will start showing the normal display.

4.1.1 Status Light Display

The POWER, ALARM/WARNING, SILENCE, RELAY 1, RELAY 2 and RELAY 3 status lights indicate the system status and provide the following data:
• POWER
o Green (steady) – Power is good and there are no trouble indic ati o ns o Yellow (steady) – Trouble is indicated by a transducer or the panel itself
• ALARM/WARNING
o Off – All indicated gas levels are below the warning level o Red (steady) – One or more gas levels are at or above the alarm level o Amber (steady) – One or more gas levels are at or above the warning level
• HUSH
o Off –There are no silenced alarms or warnings o Red (flashing) –There are alarms, warnings and/or troubles that have been silenced (gas levels may or
may not remain or continue to be at an alarm or warning levels)
• RELAY 1
o Off – Relay 1 is not on o Green (steady) – Relay 1 is on
• RELAY 2
o Off – Relay 2 is not on
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o Green (steady) – Relay 2 is on
• RELAY 3
o Off – Relay 3 is not on o Green (steady) – Relay 3 is on
The overall system status is visible at a distance via the status lights as described above. More detailed system information is displayed on the LCD, which can show the status of each relay and sensor. A typical status display is shown in Figure 4-4.

4.1.2 User Interface

The LCD display is used to show detailed information about th e status of the contro l system and the configuration parameter s to the user. The keypad is used to select the information displayed and to enter the configuration parameters, which are stored in the DVP-120 memory. The keypad consists of the usual ten-digit keys, four direction keys, plus a MENU key that is used to access the configuration menu and a HUSH key that will silence the audible alarm indicators. In normal mode, holding the zero key for three (3) seconds can be used to lock the keypad against accidental (or unauthorized) use. See Section 4.5 for details.
Figure 4-3 Keypad layout

4.1.3 Cursor Keys

In normal mode, (no warnings or alarm s ind icat ed), the up an d d own cur sor ke ys wi ll s crol l the d isplay to an y con figure d s ensors’ stat us . In normal mode, the left and right cursor keys will scroll through the status of each of the relays. When the left (or right) key is used to scroll to another relay, the display will remove the underlining under the sensor number and underline the relay number; this indicates that the digit keys can be used to jump directly to a par ticular relay’s stat us. When the up or d own key is again used the di splay will switch back to the digit keys jumping to a particular sensor.

4.1.4 MENU Key

The MENU key has three functions. First, when the system is presenting the normal display, pressing the MENU key will cause the system to shift to the Configuration Menu. The second function of the MENU key is to return to the next-higher menu level, e.g. from the sensor configuration menu to the system menu, or from the system menu out to normal mode. If in the middle of entering a multi-digit parameter, the MENU key also cancels any changes to the parameter. When the MENU key is used to return to normal mode, any changed configuration parame ters are saved in the DVP-120 ’s memory. The third function of the MENU ke y is to chang e the LCD contr ast by holding the MENU key for five (5) seconds, at which point the LCD will prompt for further activities, see sections 4.4 for more detail.

4.1.5 HUSH Key

The HUSH key is only used to silence the audible indicators (internal buzzer and possible external Horn and Strobe devices). Pressing and releasing the button will silence the internal buzzer. The HUSH button must be held for 3 seconds to silence the Horn and Strobe devices.
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