M-system MDP-LWA User manual

MDP-LWA
P. 1 / 4EM-8234 Rev.1
LIGHTNING SURGE PROTECTOR FOR
LONWORKS (FTT-10A) MODEL MDP-LWA
INSTRUCTION MANUAL
BEFORE USE ....
Thank you for choosing M-System. Before use, please check
contents of the package you received as outlined below.
If you have any problems or questions with the product,
please contact M-System’s Sales Office or representatives.
■ PACKAGE INCLUDES:
Surge protector ............................................................. (1)
■ MODEL NO.
Confirm Model No. marking on the product to be exactly
what you ordered.
■ INSTRUCTION MANUAL
This manual describes necessary points of caution when
you use this product, including installation, connection and
basic maintenance procedures.
LIMITATION APPLICABLE TO M-RESTER
The M-Rester will protect electronics equipment from
damage caused by lightning by absorbing most of the
surge voltages.
However, M-Rester may not be effective against certain
extremely high voltages caused by a direct or almost di-
rect hit by lightning.
M-Rester must be installed according to this installation
/ instruction manual.
GENERAL
■ FUNCTION & FEATURES
• Designed specifically for LONWORKS network
• No interruption of transmission signal by unplugging the
head element module
■ SPECIFICATIONS
POINTS OF CAUTION
■ ENVIRONMENT
• When heavy dust or metal particles are present in the air,
install the surge protector inside proper housing with suf-
ficient ventilation.
• Do not install the surge protector where it is subjected to
continuous vibration. Do not subject the unit to physical
impact.
• Environmental temperature must be within -5 to +55°C
(23 to 131°F) with relative humidity within 30 to 90% RH
in order to ensure adequate life span and operation.
■ NETWORK SPECIFICATIONS
• The MDP-LWA is applicable to networks which consist
only of FTT-10A. Not applicable to the ones connected to
Link Power network.
• For detailed information on the network, refer to LON-
WORKS FTT-10A Free Topology Transceiver User’s Guide
provided by Echelon.
■ DIELECTRIC STRENGTH TEST
• Loosen the screw located at the left-center of the element
and remove the element module from the base before
conducting a dielectric strength testing. Otherwise the
element will start discharging at a voltage exceeding the
max. continuous operating voltage (Uc), which can cause
insulation failure of the module.
Be sure to return the element and fasten securely after
the test.
■ AND ....
• We recommend that you keep spare surge protectors so
that you can replace them when necessary.
• Lightning surge can enter not only through signal lines
but also through power supply lines. We recommend that
you also use the surge protectors for power line for suf-
ficient protection.
COMPONENT IDENTIFICATION
Ground Terminal (G)
(used as mounting bracket)
Base
Element is secured to Base
with screw when M-RESTER is
shipped from Factory.
M•RESTER
MADE IN JAPAN N1430B
Lot.NO
MODEL
Head Element
Specifications
LINE TO LINE TO SHLD TO
LINE EARTH EARTH
Max. continuous ±1.5V min ±100V min ±160V min
operating voltage (Uc)
Voltage protection level ±40V max ±350V max ±650V max
(Up) @2kV (1kA)
Leakage current ≤0.15mA ≤20µA ≤±20µA
@±1.5V @±100V @±160V
Capacitance @1 MHz ≤200 pF ≤200 pF ≤30 pF
Response time ≤4 nsec. ≤20 nsec. ≤20 nsec.
Max. discharge current 5000A (8 / 20 µs)
(Imax)
Nominal current (IN) 100mA
Internal series resistance ≤3.3Ω including return
Max. line voltage ±1.5V
Input attenuation -1 dB max. @DC...100 kHz, Z0= 50Ω

MDP-LWA
P. 2 / 4EM-8234 Rev.1
INSTALLATION
In order to separate the head element from the base, loosen the screw located at the left-center of the element.
■ WALL MOUNTING
Refer to the drawings below.
■ EXTERNAL DIMENSIONS unit: mm (inch)
B
C
23
A
1
31.5 (1.24)
2–5 (.20) dia.
MTG HOLE
6–M4 SCREW
GROUND TERMINAL (G)
(used as mounting bracket)
27 (1.06)53 (2.08)
80 (3.15)
45 (1.77)
HEAD ELEMENT
BASE
80 (3.15) 90 (3.54)
100 (3.94)
■ MOUNTING REQUIREMENTS unit: mm (inch)
33 (1.30) MIN. 2–M4 SCREW
90 (3.54)

MDP-LWA
P. 3 / 4EM-8234 Rev.1
TERMINAL CONNECTION
Connect the unit as in the diagram below.
Be sure to cross-wire between the Ground terminal (G) and that of the protected equipment. When the surge protector is
connected with a device which has no ground terminal such like M-System’s (See figure below), ground the M-Rester Ground
terminal (G) only.
Protected DeviceMDP-LWA
G
1
3
A
C
2 SHLD
G
B
NET
A, B
Grounding
Cross wiring
*3
*2
*1
*1. Be sure to use twisted-pair cables.
*2. No polarity.
*3. With shielded twisted-pair cables, connect the shield to the surge protector’s B terminal.
Follow instructions provided with the protected device whether 2 terminal should be
connected or not. However, if the shield terminal of the protected device is not isolated
from NET A / B, DO NOT connect 2 terminal to the protected device.
M-RESTER PROTECTED
EQUIPMENT
G
G
CROSSOVER WIRE
GROUNDING
(100 ohms or less)
A crossover wire between M-RESTER ground and the ground or
metallic housing of the equipment is required for protection.
If the protected equipment has no ground terminal, ground the
M-RESTER only.
■ GROUNDING
■ NETWORK CONFIGURATION
Protected
Devices
(Nodes)
MDP-LWA
G G
G
MDP-LWA
G G
G
Protected
Devices
(Nodes)
•The MDP-LWA is applicable to networks which consist only of FTT-10A.
Not applicable to the ones connected to Link Power network.
• The maximum number of nodes connectable to the network segment is reduced by one
when one unit of MDP-LWA is added.
• When the distance between nodes are relatively long (e.g. grouped and separated by cabinets),
install the MDP-LWA by each group of devices. Insert the MDP-LWA at the surge side of the network.
• For detailed information on the network, refer to LONWORKS FTT-10A Free Topology Transceiver
User’s Guide provided by Echelon.
Crossover Wire
Crossover Wire
Grounding
Panel / Cabinet
Protected SideSurge Side
Network CableNetwork Cable
Panel / Cabinet
Protected SideSurge Side
Network Cable

MDP-LWA
P. 4 / 4EM-8234 Rev.1
M-SYSTEM WARRANTY
M-System warrants such new M-System M-Rester which it manufactures to be free from defects in materials and workmanship during the 12-month period following the date that
such M-Rester was originally purchased if such M-Rester has been used under normal operating conditions and properly maintained, M-System’s sole liability, and purchaser’s
exclusive remedies, under this warranty are, at M-System’s option, the repair, replacement or refund of the purchase price of any M-System M-Rester which is defective under the
terms of this warranty. To submit a claim under this warranty, the purchaser must return, at its expense, the defective M-System M-Rester to the below address together with a
copy of its original sales invoice.
THIS IS THE ONLY WARRANTY APPLICABLE TO M-SYSTEM M-RESTER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. M-SYSTEM SHALL HAVE NO LIABILITY FOR CONSEQUENTIAL, INCIDENTAL OR
SPECIAL DAMAGES OF ANY KIND WHATSOEVER.
M-System Co., Ltd., 5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN, Phone: [phone], Fax: [phone], E-mail: [email protected]
MAINTENANCE
Check surge protectors periodically. Many cases of light-
ning are ignored, and even lightning at a far distance often
causes inductive surges.
We recommend that you check your surge protector about
twice a year, before and after the rainy season. Check when-
ever you experience a strong lightning occurrence.
Checking procedure is explained in the following:
■ CHECKING
WIRING
1) Make sure that wiring is done as instructed in the con-
nection diagram.
2) Make sure that the Ground terminal (G) is connected to
the metallic housing of protected equipment.
3) Make sure that the Ground terminal (G) is grounded to
earth.
DISCHARGE FUNCTION
The M-Rester Tester is available for a preliminary checking
of the surge protector’s head element.
Approximate testing procedure without using the Tester is
explained as below.
1) Remove all wiring connected to the surge protector when
you test the element module.
2) Check resistance across the following terminals on the
high resistance range of multimeter (≤1V) and confirm
no conduction. The meter shows a value equivalent to
open circuit.
Terminals (A) – (B), (A) – (C), (B) – (C)
(A) – (G), (B) – (G), (C) – (G)
3) Check that discharging occurs across the same terminals
with a 500V DC 1000MΩ insulation tester. (The tester
shows ≤20MΩ.)
If any of the above tests shows negative, replace the protec-
tor.