Honeywell MIDAS LonWorks Quick Start Guide

Quick Start Guide

Midas® Gas Detector
LonWorks® Interface Module

1. Introduction 2. Mounting the Interface 3. Mounting the Midas

i)

The Midas® LonWorks® interface module is
installed behind the standard Midas® gas
detector as shown in Figure 1. Power and
data connections are supplied directly to the
LonWorks® interface module. All power and
communication to the Midas® unit is provided
via the LonWorks® interface.

See reverse side for mounting information

Figure 1

Customer Wiring

Unscrew LonWorks® interface top plate.

i)

Mount the interface and tighten screws.

ii)

See mounting template on reverse side.

Connect 24V DC power and LonWorks®

iii)

wires to the pluggable connectors. See
wiring diagram on reverse side.

Clamp the cables in the supplied gland

iv)

as shown in Figure 2. A spare gland is
included.

Reinstall top plate on the interface.

v)

Figure 2

Loosen thumbscrew on front of Midas®.

Remove unit cover.

ii)

iii)

Loosen two screws on bottom front of
chassis.

iv)

Separate main chassis from mounting
bracket assembly.

Mount the Midas® mounting bracket

v)

assembly onto the LonWorks® interface.

vi)

Tighten screws.

Align the PCB at the top rear of the main

vii)

chassis with the connector located at the
top of the mounting bracket assembly.

viii)

Slide the main chassis backwards on the
mounting bracket assembly so that the
PCB and connector and tubes engage
simultaneously.

WARNING: DO NOT PUSH ON THE LCD AS
THIS MAY CAUSE DAMAGE.

ix)

Tighten the screws to secure the main
chassis to the mounting bracket assembly.

®

4. Cabling the Interface 5. Install Cartridge 6. Conguration Contact Us

i)

Gently pry the clear locking
tab outside of the yellow jacket
on both ends of the cable as
shown.

Ensure yellow jacket has not moved out of
position when inserting to the Midas® or LON
Module connectors (clear tab is to rest on top of
the yellow jacket bubble).

Caution: Do not over-extend the tab as damage
may result.

ii)

Bend the cable into 1½ loops
as shown. The two connectors
should be approximately 3 cm
apart. This is to reduce torque
on the installed connector.

iii)

Plug the cable into the Midas
and the Interface as shown.
Loosen the black plastic cable
locker on the bottom of the
Midas. Slide this clamp under
the cable locking tab to
prevent the tab from being
depressed. Tighten the locker.

Check the part number and type of sensor

i)

cartridge is correct.
Check the “activate by” date.

ii)

Remove sensor cartridge from packaging.

iii)

Carefully push the sensor cartridge into

iv)

the sensor cartridge chamber until fully
seated.

Lock the sensor cartridge in place using

v)

the tabs on both sides of the sensor
cartridge.

Confirm that the power switch in the

vi)

mounting bracket assembly is in the ‘on’
position.

Refit the unit cover by aligning the slots

vii)

either side with the locating tabs on the
mounting bracket assembly.

Tighten the thumbscrew located on the

viii)

front panel.

Install the supplied RJ-45 cable between

ix)

the Midas® and the LonWorks® interface.

Turn on 24 VDC power.

i)

Confirm that the Midas® initiates the power

ii)

up sequence.
Reset Fault F49 if present.

iii)

Set alarm levels and other parameters as

iv)

desired.
Confirm that the Midas IP parameters are at

v)

default values. If changed, the DHCP client
must be set to ‘n’. The IP address must be
restored to 169.254.60.47 and the subnet
mask must be restored to 255.255.255.0

For further details please refer to the Midas® oper­ating manual MIDAS-A-001 and LonWorks® Tech
Note 1998-0643.

A replacement shielded interconnect cable may be
purchased separately. Order part number MIDAS­A-040.

LonWorks® is a registered trademark of Echelon
Corporation.

Find out more

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Customer business center

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Tel: [phone]

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Europe and the rest of the world

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Part No. MIDAS-A-037
Issue 2 12.06
© 2006 Honeywell Analytics

100 mm

(2.54 in.)

130 mm

22.2 mm

58.5 mm

(2.303 in.)

43.5 mm
(1.71 in.)

Ø 12.70 mm

(0.50 in.)

Clearance needed below Midas for tubing and cables.

Mounting Template

LonMark Object Diagram

See Tech Note 1998-0643 for details.

MIDAS LonWorks Device

Open-loop sensor Functional Block

nviReset

SNVT_lev_disc

nvoConc

SNVT_ppm_f

nv1

nvoFaultD

SNVT_lev_disc

nvoFaultS

SNVT_switch

nvoAlm2

SNVT_lev_disc

nvoAlmL

SNVT_lev_disc

nvoAlmThresh1

SNVT_ppm_f

nvoAlmThresh2

SNVT_ppm_f

nvoCellLife

SNVT_elapsed_tm

nviRelay1

SNVT_lev_disc

nviRelay2

SNVT_lev_disc

nviRelay3

SNVT_lev_disc

nvoAlmS

SNVT_switch

nvoGasSelection

SNVT_count

Mandatory

Implementation-Specific

nvoMonState

SNVT_state

nvoNstat

SNVT_state

Virtual Function Block

nciMaxSendT

SNVT_elapsed_tm

cp22

nciMinSendT

SNVT_elapsed_tm

cp24

Node Object Functional Block

nvoStatus

SNVT_obj_status

nv2

nviRequest

SNVT_obj_request

nv1

nvoChkSum

SNVT_count

nv3

Mandatory

Implementation-Specific

Wiring Diagram

Plug 2

Plug 1

Pwr +24 VDC

Lon A

Lon B

Pwr Common

Pwr +24 VDC

Lon A

Lon B

Pwr Common

Power Consumption:

Transmitter unit < 5 W

Transmitter with pyrolyzer (std or HTP) < 12.95 W

Transmitter with LonWorks Module < 8 W

Transmitter with LonWorks and pyrolyzer < 15.95 W

Wiring Notes:

Maximum wire size is 1.5 mm (16AWG)

i)

Input voltage range is 21.6 to 26.4 VDC.

ii)

It is mechanically possible to misalign Plug 1 and Plug 2. Care should be taken when

iii)

inserting plug to assure correct alignment.
Plug 1 and Plug 2 are internally connected in parallel to facilitate wiring in bus topology.

iv)

LonWorks FT-10 wiring is polarity-insensitive. Lon A and Lon B may be swapped.

v)

Note:

The Midas® LonWorks® interface draws approx 1.7 amps for approx 100 mS after power is applied.
External equipment should be sized appropriately. Additionally, the Midas® requires the supplied power
to rise to the minimum specification (21.6 VDC) within 500mS.