GLT-299-7-13 Rev.1
Jan 24, 2022
1
Instruction Manual
VDOT-ZMU-SCI Zone Module
Before Installation
Please read these instructions carefully and keep for future reference.
The information in this document is subject to change without notice.
For updates please refer to our website.
Note
：
Follow the requirements for the installation of the product in
accordance with the Specifications. Otherwise it may cause malfunction.
Note
：
Do not install the product in any location where oil, dust, iron
powder, chemicals, or hydrogen sulphide may occur or affect the product.
It may cause malfunction.
This package contains the following items:
Main unit
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1
Outer cover
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1
Instruction Manual
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1
Tapping screw
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2
Pan head screw
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2
EOL Resistor (VDOT-RE-10k)
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1
General Description
VDOT-ZMU-SCI Zone Module with Short Circuit Isolator is intended for
use in addressable two wire systems, which can be connected with
2-wire conventional detectors. The module monitors and transmits the
status (normal, open, short, or alarm) of zone with the detectors to a
control panel. The initiating device circuit (IDC) can be wired on Class A
or Class B.
General Operation
Normal standby condition: The module receives polling from the control
panel at the regular interval. Polling LED (green) flashes.
Alarm condition: When an external input is activated, Input LED (red)
illuminates, and the module communicates to the control panel the
alarm status.
Trouble condition: If an overcurrent occurs because SLC (Signaling Line
Circuit) is shorted, SCI LED (yellow) illuminates, and the module
communicates to the control panel the short status. The module also
communicates to the control panel the open/short status of IDC,
depending on the Subtype Setting described below.
SCI (Short Circuit Isolator) Function
The module has a built-in short circuit isolator. SCI circuit prevents
entire loop failure in the event of a short between L+ and L- on the loop.
If a short is detected between L+ and L-, the yellow LED indicator is
illuminated. The line between Lin- and Lout- is disconnected
automatically to isolate the short circuit, and short circuit status is
communicated to the control panel. Upon removal of the short condition,
the module will automatically connect between Lin- and Lout- to restore
the entire loop to the normal operating status.
Polling LED (GREEN)
Input LED (RED)
SCI LED (YELLOW)
Address Setting Port
Figure 1
Figure 2
ZETA ALARMS LIMITED
72-78 MORFA ROAD, SWANSEA, SA1 2EN
http://www.velocitydetection.com
Make sure to turn the power off before commencing any wiring work.
Otherwise it may cause electric shock or damage to equipment.
CAUTION
!
Do not disassemble, repair, or modify the products. It may cause a fire or
electric shock.
CAUTION
!
Do not use the products outside the rated power supply voltage range
specified in the Specifications. It may cause a fire or damage to
equipment.
CAUTION
!
