1.0 Introduction

The following document explains how to install the KB 2-door or 4-door controllers and the
peripherals that connect to KB controllers. Other wiring diagrams and additional installation
information can be found on the knowledge base at help.kerisys.com

2.0 Important Note:

Keri Public Statement on the Amazon Key

3.0 Product Specifications

3.1 Unit Dimensions

• KB 2D/4D controller PCB

- 6.75 inches high by 6.00 inches wide by 1.75 inches deep, including wiring connectors

- (17.15 cm by 15.25 cm by 4.45 cm)

• Enclosure

- 13 inches high by 9 inches wide by 4 inches deep - (33.02 cm by 22.86 cm by 10.16 cm)

• Operating Temperature/Humidity Range

- 32°F to 150°F (0°C to 60°C)

- 0% to 90% relative humidity, non-condensing

3.2 Controller Power Requirements

Input Power

• 10 to 14 VDC @ 2.5 A (maximum current draw for a fully loaded KB 2D/4D controller)

Output Relay Contact Rating

• 1 Amp @ 24 VDC

Current Draw Requirements as 12VDC

• 650 mA max for an KB-4D Controller

• 570 mA max for an KB-2D Controller

• 210 mA max for each NXT-4x4

• 85 mA max for each NXT-1R, NXT-3R, NXT-4R, or NXT-5R Reader

• 115 mA max for each NXT-6RK Reader

• 50 mA max for each NXT-RM Reader Interface Module

3.3 Battery Backup

The KB controller uses a CR-2032 3 volt backup battery that retains all controller
configuration and cardholder records if the controller is down-powered.
The voltage level of the battery should be checked annually.

4.0 KB Controller Wiring Diagram

Notes:

• This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy, and if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area may cause harmful interference in which case the owner will be required to correct the interference at the owner’s expense.
  

5.0 Recommended Cable Options

Notes:

• RS-485 bus runs can daisy-chain together an NXT-4x4 and NXT-Reader on one data line. The total cable run distance should be no more than 500 feet from the NXT controller for runs with 4x4s and no more than 1,000 feet for reader-only runs.
• Cables that carry data should always be twisted, shielded and stranded, AWG24.

• Cable resistance causes a drop in voltage at the end of long cable runs. Ensure the appropriate power and current for your device is available at the device at the end of the cable run. Heavier gauge cable reduces this effect.

• A 4x4 module should be powered from its own power-supply if the controller is powering a RIM and a reader/or keypad, or if the 4x4 module and connected reader current draw exceeds 250mA (the maximum amount of current available per bus).

• Reader and data cable shield drain should be grounded at the controller's earth-ground point. Typically, this is the ground lug labelled J6.

1. To meet CE and C-tick regulations, the length of the controller power line can be no longer than 3 Meters (9.85 feet).
2. Use the shortest possible path from earth ground point to PCB. Connect the earth ground only to the designated pin on the terminal block. This is important as all
   transient protection for the unit is made through this earth ground connection.
   For unit protection, the earth ground connection should always be made first.
3. Values listed are minimums. Individual input and output devices may have
   more specific requirements.

6.0 KB Controller LED Definitions Table

7.0 Lock Wiring and Power

Important Notes:

• Keri recommends using separate power supplies for the controller and the electronic locking devices (magnetic lock, door strike, etc.), unless you are using Altronix Trove or Life Safety Power. If you do use the same power supply for both the controller and the electronic locking device, also ensure the power supply provides enough current to drive the controller, the locking device, and any peripherals that may be connected (i.e., reader, 4x4, RIM), including an adequate safety margin.

• Locks with a current draw greater than 1 amp should be powered separately.

• Maglocks should be on their own supply due to the power surge created by these locks, when locking and unlocking, that could affect controller operation.

• Keri recommends the use of door locks from dormakaba, ASSA Abloy, and Allegion, as well as from SDC and Dortronics.
• Transorbs should be installed as close to the lock as possible. Transorbs are supplied with the controller ship kit (1 for each controller bus), and they protect the controller from voltage spikes from the lock.

7.1 Wiring a Fail-Safe Lock

7.2 Wiring a Fail-Secure Lock

7.3 Controller Port Protection

Transorbs are provided with the controller ship kit. They are used to protect the controller from voltage spikes induced on the port wiring by absorbing the excess voltage and slowly releasing it back into the circuit. Keri strongly recommends wiring in the transorbs provided with the controller ship kit.

Note: The transorbs that Keri provides are non-polar; they can be installed in either
orientation.

7.4 Using Isolation Relays

For locking devices that may induce heavy voltage spikes – Mag Locks and devices with heavy-duty solenoids such as turnstiles, vehicle gates, and overhead doors – Keri recommends using isolation relays. Keri has an Isolation Relay Kit (p/n IRP-1). The transorb should be installed as close to the lock as possible. Please refer to the IRP-1 Isolation Relay Installation Guide (p/n 01833-001) for further detailed information.

8.0 Wiring Instructions

8.1 Terminal Blocks

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8.2 Connecting the Earth-Ground and the 12VDC Power

9.0 KB Controller Earth-Grounding

9.1 At the Controller's Metal Enclosure

To ensure optimum earth-grounding of the controller and its connected peripherals, you should make a quality earth-ground connection to the metal enclosure lug (which displays an adjacent earth-ground symbol).

This good-quality earth-ground at the enclosure lug will provide an earth-ground for the entire enclosure - and will therefore ground anything that is connected to the metal enclosure - (the four metal screws at each corner of the PCB) - plus, through circuitry on the PCB, this includes anything connected to the lug marked J6 or pin 3 of the TB10 power connector.

In addition, the enclosure itself must be earth grounded to a good quality ground point external to the enclosure for a complete path to ground.

9.2 At the Controller's Earth-Ground Lug

KB controllers have Ground Lug J6 at the top of the PCB near the TB10 power connector. Make your earth ground connection directly to this lug.

10.0 NXT Reader Wiring and Grounding

Additionally, the shield/drain wire of any reader/peripheral cables MUST be terminated to one of the following points-any corner screw attaching the controller to the enclosure, Pin 3 of TB10, the PCB ground lug (J6) on the controller, or the ground lug of the enclosure. Failure to properly earth ground the reader/peripheral drain wire may result in unreliable communication or operation of the attached peripheral.

The following diagram illustrates correctly grounding an NXT reader at the controller.

11.0 MS/NXT-6RK/Wiegand Reader Wiring

Keri MS readers, NXT-6RK or Wiegand readers are connected to the KB controller via a Reader Interface module (RM3).

Refer to the RM3 Reader Interface Module Installation Guide for further installation instructions for Keri MS, Wiegand and Keri NXT-6RK keypads and for RM3 module configuration:

Note: A WI + module is also available for Wiegand readers. This is a non-configurable reader interface module for Wiegand-Only.

Note: As referenced in the previous section, the shield/drain wire of any reader/peripheral cables MUST be terminated to one of the following points-any corner screw attaching the controller to the enclosure, Pin 3 of TB10, the PCB ground lug (J6) on the controller, or the ground lug of the enclosure.

• NXT RM3 Installation Guide:

https://help.kerisys.com/portal/en/kb/articles/rm3-installation

12.0 Controller Maintenance

12.1 The 3-volt Lithium Backup Battery

The controller's backup battery retains all controller configuration, including cardholders. If this battery is flat and the controller loses power, cardholders will not be able to gain access. The backup battery voltage should be checked every year.

Notes:

When changing the controller's backup battery you should do the following:

1. Check that the controller is online - so you will be able to update it.
2. Ensure the controller is down-powered when you remove the backup battery.
   - failure to do so may permanently damage the controller.
3. Perform a sync after changing the controller's backup battery.
   - the controller will need to be updated when the battery has been replaced.

12.2 The Power-Supply Backup Battery

Many installations also use backup batteries connected to the power supplies - this will keep the controller powered-up for a certain amount of hours if there is a power-outage at the site. Again, these backup batteries should be checked every 18 months-2 years.

After a while, battery backups on the power-supply may develop a fault - often causing them to draw more current from the power-supply. With certain power-supplies this may result in less power being available for the controller and its connected peripherals - If you disconnect the PSU backup battery, and the voltage is low, then it is likely that the battery needs replacing.