MDP-LWA
P. 3 / 4
EM-8234 Rev.
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 Device
MDP-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 Side
Surge Side
Network Cable
Network Cable
Panel / Cabinet
Protected Side
Surge Side
Network Cable
