Specifications

Vancouver Police Service
Command
Production Specification
SVI #847 Page 76 of 107 September 18, 2012
A voltmeter shall be mounted on the driver’s instrument panel to allow direct observation of the system voltage.
Electromagnetic Interference
Electromagnetic interference suppression shall be provided, as required, to satisfy the radiation limits specified in SAE
J551/1, Performance Levels and Methods of Measurement of Electromagnetic Compatibility of Vehicles, Boats (up to 15
m), and Machines (16.6 Hz to 18 GHz).
Wiring Diagram
A complete electrical wiring schematic of actual system shall be provided with finished apparatus. Similar or generic type
electrical schematics shall NOT BE ACCEPTABLE.
Low Voltage Electrical System Performance Test
A low voltage electrical system test certification shall be provided with delivered apparatus.
12 VOLT MULTIPLEX CONTROL CENTER
The apparatus shall be equipped with a Weldon V-MUX multiplexed 12 volt electrical system that will provide complete
diagnostic capability, No Exception. The system shall have the capability of delivering multiple signals via a CAN bus,
utilizing specifications set forth by SAE J1939. The system shall be node based to maximize stability so that failure of one
node does not affect the operation of the other nodes. The system shall use shielded twisted-pair wire for transmission of
system function signals. The shielded wire shall provide protection against EMI and RFI noise interruptions.
The multiplex system shall be responsible for providing power management functions as well as load shedding. The
warning light system shall be controlled by the multiplex system. The system shall be capable of displaying text and/or
graphic messages on a display module. The system shall be based on solid-state technology and shall include self-
contained diagnostic indicators.
Outputs:
The outputs shall perform all the following items without added modules to perform any of the tasks;
1. Load Shedding: The system shall have the capability to load shed with 8 levels any output. This means you can
specify which outputs (barring NFPA restrictions) you would like load shed. Level 1 12.9v, Level 2 12.5V, Level 3 -
12.1V, Level 4 - 11.7V, Level 5 11.3V, Level 6 10.9V, Level 7 10.5, Level 8 10.1. Unlike conventional load shedding
devices you can assign a level to any or all outputs.
2. Load Sequencing: The system shall be able to sequence from 0 8 levels any output. With 0 being no delay and 1 being
a 1 second delay, 2 being a 2 second delay and so on. Sequencing reduces the amount of voltage spikes and drops
on your vehicle, and can help limit damage to your charging system.
3. Output Device: The system shall have solid-state output devices. Each solid-state output shall be a MOS-FET (Metal
Oxide Semiconductor - Field Effect Transistors); MOS-FETs are solid-state devices with no moving parts to wear out.
A typical relay when loaded to spec has a life of 100,000 cycles. The life of a FET is more than 100 times that of a
relay.
4. Flashing Outputs: The system shall be able to flash any output in either A or B phase, and logic is used to shut down
needed outputs in park, or any one of several combined interlocks. The flash rate can be selected at either 80, 160 or
200 FPM. This means any light can be specified with a multiplex truck with no need to add flashers. Flashing outputs
can also be used to warn of problems or other unique idea you may come up with.
5. PWM: The modules shall have the ability to PWM at some outputs so that a headlight PWM module is not needed.