HIT-NOT DDAC-AM-SM Area Monitor User Manual

: June 6, 2024
: HIT-NOT

Table of Contents

Overview
Operation
Revision History
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HIT-NOT Proximity System
Area Monitor
User’s Manual v1.0

FREDERICK ENERGY PRODUCTS, LLC
1769 Jeff Road
Huntsville, AL 35806
1.800.489.6915

Overview

The Area Monitor (AM) provides complementary capabilities to a HIT-NOT® Proximity Protection System. It detects the presence of a 73 kHz magnetic field generated by a HIT-NOT® Magnetic Field Generator (MFG). When the magnetic field strength reaches a high enough level, the Area Monitor initiates a predetermined action. The Area Monitor threshold is adjustable by the user. A typical purpose of the Area Monitor is to activate a flashing light to alert workers of an approaching truck. It is thus ideal for intersections and pedestrian areas with blind corners. The Area Monitor is typically installed at a fixed location. The predetermined actions are initiated via discrete signals sent out via wires to other devices such as lights, gates, horns, etc.

1.1 Theory of Operation

The functions of the Area Monitor are:

To sense the 73 kHz field generated around a vehicle or piece of machinery equipped with an MFG.
To echo a signal back to the MFG to confirm signal recognition.
Turn on a discrete signal output when the 73 kHz signal from the MFG is confirmed and exceeds a preset threshold. (The threshold is adjustable by the user.)

When the magnetic field from an MFG system installed on a moving vehicle impinges on an Area Monitor, the Area Monitor will detect the 73 kHz magnetic field from the generator and analyze its field strength. The Area Monitor sends an echo back to the MFG with a 916.48 MHz transmission to confirm the signal recognition, but it does not send an alert to the MFG. Instead, when the 73 kHz field strength received by the Area Monitor is above a certain threshold, the Area Monitor sends discrete signals to two independent output connections labeled as Mode “Out A and Mode Out B. This enables one or two peripheral devices to be connected to the Area Monitor via an electrical cable. Each mode can be used alone or both modes can be used simultaneously. Examples of peripheral devices include lights, gates, horns, etc.
There are two mechanical slide-switch assemblies (one for each output mode) that allow the further definition of four possible actions for each mode. Example actions that can be selected include whether the discrete signal is continuous, the signal times-out, the signal is normally ON, or the signal is normally OFF. Further details are given in Section 2.1.2 – Operation.

1.2 Frequency of Operation
The Area Monitor receives on a frequency of 73 kHz and transmits at 916.48 MHz.

1.3 FCC/IC Information

The FCC ID for the Area Monitor is QUI-DDAC-AM-SM and complies with Part 15 of the FCC Rules. Operation is subject to the following conditions:

This device may not cause harmful interference.
This device must accept any interference received including interference that may cause undesired operation.

Any intentional or unintentional changes or modifications to the configuration of the Range Adjust Tool, not expressly approved by Frederick Energy Products LLC, could void the user’s authority to operate the equipment.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
–Reorient or relocate the receiving antenna.
–Increase the separation between the equipment and receiver.
–Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
–Consult the dealer or an experienced radio/TV technician for help.

The required notices are specified in the RSS documents (including RSS-Gen) applicable to the equipment model. These notices are required to be shown in a conspicuous location in the user manual for the equipment or to be displayed on the equipment model. If more than one notice is required, the equipment model(s) to which each notice pertains should be identified. Suppliers of radio apparatus shall provide notices and user information in both English and French.

This device complies with Industry Canada license-exempt RSS standards (s). Operation is subject to the following two conditions:

this device may not cause interference, and
this device must accept any interference, including interference that may cause undesired operation of the device.

Operation

2.1 Installation Information
The Area Monitor typically mounts at a fixed location on walls, posts, etc. Mounting can be accomplished using four magnets shipped with the unit, or other mounting methods such as bolts, U-bolts, etc can be used. The exact location is selected based on where the user wants the moving vehicle to cause activation of the peripheral device. For example, it may be desired to activate a flashing light at a point at some distance before the moving vehicle reaches the flashing light. In this case, the Area Monitor would be positioned far enough away to provide adequate warning of the approaching vehicle while the peripheral warning light would be mounted at the specific point where the danger to pedestrians was greatest. A mounting location should be free from strong electromagnetic interference (EMI). Mounting close to a source of EMI may result in erratic responses, especially if very close proximity to some electronic devices. A safe guideline is to keep the Area Monitor at least 21 inches away from any electrical/electronic device (including hidden electrical power wires). One test to determine whether the location is acceptable is to hold a Personal Alarm Device (PAD) at the same potential location where the AM is to be mounted. Then verify that the PAD functions OK when near the edge of a magnetic field from an MFG. If the PAD functions properly then the Area Monitor will likely function properly also.

2.1.1 Wiring Connections for Peripheral Devices
An Area Monitor includes a six-wire output cable “pigtail” stored in the Area Monitor Mounting Base. These wires provide connections for the Mode Out A and Mode Out B options.

Mode Out A – To use output Mode Out A, connect the Red wire to the peripheral device positive connection and the Black wire to the peripheral device negative connection.
Mode Out B – To use output Mode Out B, connect the Orange wire to the peripheral device positive connection and the Green wire to the peripheral device negative connection.
There are also Blue and White wires in the cable that can be used to gang multiple lights together. Contact Frederick Energy Products, if this feature is needed.

As discussed earlier, either Mode Out A or Mode Out B can be connected alone, or they can be simultaneously connected to separate peripheral devices.
2.1.2 Multiple Output Functional Options

In addition to the availability of two different output channels (Mode Out A and Mode Out B), each of these output channels have four functional options for their operation. These options are selected via a set of two slide switches (SW1 and SW2) for each output channel. Table 1 below delineates the four options for each output channel.

Table 1. Mode Switch Settings

Mode Out A	Mode Out B

SW1
Setting| SW2
Setting| Mode Function| SW1
Setting| SW2
Setting| Mode Function
ON| ON| Output times-out after 5 sec when MFG is present| ON| ON| Fast Flash of lights when MFG is present.
OFF| ON| Continuous output when MFG is not present – stops when MFG is present| OFF| ON| Continuous output when MFG is not present – stops when MFG is present
ON| OFF| Output times-out after 3 sec when MFG is present| ON| OFF| A slow flash of lights when MFG is present
OFF| OFF| Output continuous – when MFG is present| OFF| OFF| Output continuous – when MFG is present

2.1.3 Inoperability Warning
The primary source of inoperability for an Area Monitor is erratic behavior caused by EMI sources near the unit. Excessive EMI impinging on the Area Monitor can cause the AM sensing elements to inaccurately sense magnetic field strength; thus, shortening the detection distance.
2.2 Charging
The Area Monitor receives 12 VDC power from a Wall Wart Power Converter connected to a 110 – 240 VAC power source.
2.3 Alerts
Area Monitors do not issue alerts other than the deliberate discrete signals sent to peripheral devices.
2.4 Maintenance
The Area Monitor should be regularly cleaned to reduce the buildup of dust and dirt. A daily check should be performed to verify that power is applied. There is a blue power-LED on the Area Monitor, visible on the housing. There also should be a daily test to verify that the detection range of the Area Monitor is acceptable. The detection can be tested by driving a MFGequipped-vehicle by the Area Monitor.
2.5 Adjustments
A potentiometer installed on a printed circuit board (See figure in Section 2.1.2) provides the capability for users to adjust the range where moving vehicles with MFG are detected. The maximum range for the Area Monitor detection is approximately 43 ft. To perform the adjustment, park the vehicle with MFG at the desired distance away from the Area Monitor (within 43 ft. of each other). The proper field is set when the Orange LED on the printed circuit board illuminates. Turn the potentiometer knob to the right to increase the distance, and to the left to decrease.
2.6 Interferences
There are instances when the magnetic field generated from other sources such as an electrical panel, motorized machinery, large conductor cables, etc. can generate EMI disturbances that are picked up by the Area Monitor. However, these disturbances are usually local in nature, and moving the Area Monitor a few feet from that location will result in a location with an acceptable EMI environment.

2.7 Area Monitor Specifications
Model Number: HN-AMDC
Size: 15” x 4” x 8” / 381 mm x 102 mm x 200 mm
Weight: 3.2 lbs ./ 1.45 kg
Input Voltage: 12 VDC
Magnetic Field Frequency: none
Receiver Frequency: 73 kHz signal
Transmitter Frequency: 916.48 MHz
Transmitter Power: 0.001W (typical)
Area Monitor Battery: none
Operating Temperature Range: -40°C to + 55°C ; -40°F to 130°F
Shipping Considerations: none