© JVA Technologies Pty Ltd
Page 4 of 32
Issue:3/03/2021 9:39:00 AM
OEM technical manual.docx
INTRODUCTION
The ZLM4 is a 4 zone low voltage electric fence monitor. The ZLM4 may be used by itself or in conjunction with a
number of high voltage security electric fence energisers. The ZLM4 monitors up to 4 loops of fence wire, each up
to several hundred meters long, to detect someone tampering with the fence by cutting or shorting the wires.
When used in conjunction with a high voltage electric fence energiser the ZLM4 is wired to the non energised earth
wires on the fence. In this way the ZML4 can be used to split one high voltage zone into up to 4 low voltage
monitored zones for improved targeting of the response to potential security breaches.
The ZLM4 is compatible with the JVA Z series energisers. It may be connected via a Keypad bus network with
other Z series devices to enable the whole group to be controlled via one keypad, or linked to a PC running
Perimeter Patrol.
The ZLM4 monitors a low voltage loop using intrinsically safe, isolated ELV DC. It employs a continuity check for
detecting open circuits, DC voltage level sensing to detect a short to ground and pulse voltage sensing to detect a
short to a line powered by a high voltage fence energiser.
The advanced features of this device allow the performance to be tuned to the fence and to the particular
requirements of the site. This is done by adjusting the devices programmable options.
The ZLM4 will report an alarm on seeing a low voltage loop cut (open circuit), shorted to ground (short), when high
voltage from an electric fence energiser wire is shorted to the monitored low voltage loop or when two low voltage
loops short to one another (cross couple).
Scope and Purpose
•
This document is intended for the training of engineering and technical personnel both internally at Pakton
and for our OEM customers.
•
As a reference for the features and specifications per version, as such it will be kept up to date and re-
issued with each revision of the PCB or firmware. Please ask Pakton for the latest version.
•
The users / installation manual will be drawn directly from this material (reformatted). Information NOT
meant to be included to end users should be identified by
an “OEM only” comment.
This manual relates to:
PCB versions:
1.00 or higher
Firmware version:
1.00 or higher (the firmware version is shown on the LCD after reset)
Current Firmware:
1.33
Latest Version
The latest version of this OEM manual should be available from
The latest version of the Users manual should be available from
