D&R ELECTRONICS PDU42WB User manual

Part NO: 212-0024WB 1July 30th, 2019
Power Distribuon Unit
PDU42WB
Installation / Operations Manual
Table of Contents
Applicable Models ........................................................ 2
Introduction ................................................................... 2
General Warnings.......................................................... 3
Unpacking &Pre-Installation Check ............................. 3
Installation & Mounting ............................................... 4
Wiring and Setup Instructions....................................... 4
Output Fuse Combinations............................................ 6
Timed Modes Of Operation ........................................ 12
Maintenance ................................................................ 13
Parts List ..................................................................... 13
Troubleshooting........................................................... 14
Product Specifications ................................................ 15
Warranty...................................................................... 16

Part NO: 212-0024WB 2July 30th, 2019
Applicable Models
 PDU42WB
Introduction
The Power Distribution Unit (PDU) is a compact and convenient point of load power dis-
tribution product for installed electrical devices. By using this device and carefully plan-
ning the distribution of mobile equipment power feeds, complex independent wire runs
and unreliable fuse panel connections can be avoided.
The PDU42WB is directly connected to the vehicle battery and ground, thus providing a
direct easily traceable route to the input power source avoiding interfering with the vehi-
cles factory wiring harness. The specifics for safely connecting the PDU42WB to a vehi-
cles electrical system are outlined in the detailed instructions to follow.
Each circuit can be individually fused further reducing risk of damage to devices from
circuit overload. Each fused output has a red LED to indicate when a circuit fuse is
GOOD.
The PDU42WB unit provides a single 30A high current output and up to 18 additional
outputs divided into “constant/battery”, “ignition controlled” and “timed” outputs to meet
the typical in-vehicle equipment installation requirements. These output features have
the following characteristics;
1) Constant/Battery Outputs:
There are 6 output connections each with individual fuses, that are on at all times
providing the PDU is connected to the battery.
2) Ignition Controlled Outputs;
The 6 output power connections, also individually fused provide +12V output
while the vehicle ignition is on. Power will be immediately turned off at these out-
puts when the vehicle is shut down and the ignition key removed (some vehicles
still maintain and “ignition on” signal when the key is still in the ignition switch)
careful selection of the proper ignition control wire can help avoid this situation..
3) Timed Outputs;
There are 6 output power connections again with individual fuses. These outputs
are on while the ignition control signal is applied to the PDU, and will go through
a pre-set timed off sequence once the ignition is turned off. The time to off is user
selectable and is selected by the installer based on the system design.
This timed off sequence is also controlled by an onboard battery voltage monitor.
If the battery voltage becomes too low the timing sequence is interrupted and a
shut down of the timed outputs will begin. This feature prevents a total discharge
of the vehicle battery while the ignition is off and the equipment is in use.

Part NO: 212-0024WB 3July 30th, 2019
General Warning
1. The use of emergency warning devices does not ensure the safety of the operator. The
operator is responsible to ensure safe operation of the vehicle regardless of whether
the warning device is in operation or not
2. The effectiveness of this or any warning device is highly dependent on proper installa-
tion and maintenance. Read the manufactures instructions before installing and follow
all recommendations.
3. When in use the operator must ensure that the warning signal is visible and not ob-
structed by vehicle components (i.e. open trunk lid), people or other obstructions
4. This device is intended for use by authorized personnel only The user is responsibility
to ensure that all local, state/provincial and federal laws are being complied with.
D&R assumes no liability for any loss resulting from the use of this device.
5. The device must be installed so as not to reduce the output performance of vehicle sys-
tems
6. Placement of control switches must be so as to provide convenient reach for the opera-
tor without loosing eye contact with the road.
7. Emergency warning devices require high electrical voltages and/or currents. Properly
connect and ground all circuits. Shorting or improper grounding of this device may
caused personal injuring, vehicle damage or both
8. All operators should be properly trained in the operation of this device to ensure
both their and public safety
Unpacking & Pre-Installation Check
D&R Electronics Co. advises that you open and examine all shipments within 48 hours of
receipt. The Power Distribution Unit PDU is shipped pre-assembled and factory tested.
All necessary hardware for standard installation is included. Remove all components from
the shipping carton.
Use this pre-installation check list to verify your unit:
1. Confirm contents with the packing slip
2. Examine unit for damaged in transit (i.e. scratches, broken or bent connectors. etc).
Report any damage to the carrier immediately. Keep all shipping material
3. The unit is factory tested and a pre-installation check is not needed.

Part NO: 212-0024WB 4July 30th, 2019
Wiring and Setup Instructions
1. Good wiring practice and thorough knowledge of vehicle power system is required by the
installer of this and any other product.
2. Looms, grommet, cable ties or other installation hardware should be used to anchor and
protect wires
3. All wire should conform to the minimum wire size as specified by the manufacturer.
4. Splices should be minimized and made in a fashion so as to protect from corrosion to re-
duce loss of conductivity.
Warning
Installation and Mounting
1. Any device used inside a vehicle, may cause severe personal injury if not properly mounted
and secured. Objects used in the vehicle may become airborne during a collision or other
sudden changes in vehicle speed or direction, such as braking, acceleration or turns.
2. Be sure to mount unit through the steel of the vehicle. Avoid mounting through plastic or
other non-structural materials.
3. POINT OF INSTALLATION MUST NOT INTERFERE WITH DEPLOYMENT OF
VEHICLE AIR BAGS.
4. D&R Electronics recommends this and any of our other products be installed by quali-
fied professionals.
Warning
Mounting the PDU unit
The PDU42WB may be mounted anywhere inside the vehicle away from heat, moisture or the
elements. NOTE the PDU is not watertight do not mount it in the engine compartment, on the
exterior of the vehicle or an area where moisture/dirt/ other contaminants can fall into the ex-
posed areas of the PDU.
Ensure that the mounting location is flat and the device is secured to solid vehicle body parts
To mount the PDU unit proceed as follows:
1. Determine an appropriate mounting location
2. Confirm there is adequate access and clearance for the wiring and its connections.
3. Secure the PDU with 4 self tapping mounting screws (not supplied).

Part NO: 212-0024WB 5July 30th, 2019
Note: The exact number of available connections varies by application, refer
to the specifications and typical output fusing combinations to ensure that the
safety and reliability of this product is not compromised.
Figure 1
End View of the PDU42WB showing the location of the Input and Output connectors.
The wiring to the PDU will be determined by the installers design of the power
distribution and wire routing for the installed equipment.
Fuses and wire for the screw terminal outputs are selected based on equipment
power requirements and their manufacturers recommendations. The maximum
fuse sizes and some possible combinations are shown in a table on the following
page Figure 2.
The fuses are indicated as 15A maximums, the x is no fuse or no connection and
the N/A means that the limit of that area has been reached with the indicated max-
imum fuse values and that spot is not available. Many combinations can be de-
rived based on the PDU specifications and the equipment power requirements.
The table in Figure 2 shows six of these possible combinations, these can be used
as a starting point to help plan the power distribution for the intended application.
NOTE: Interconnect Wire, Mounting Hardware, Fuses and any termination
or additional hardware mentioned in the installation procedure IS NOT
SUPPLIED. These items are industry standard and are provided by the
installer at the time of installation.

Part NO: 212-0024WB 6July 30th, 2019
Figure 2
Typical fuse and output combination showing maximum fuse ratings for 10A
continuous loads, the chart is read vertically the six possible combinations
shown add to a total draw of 60A (The maximum PDU Input rating)
Output Fuse Combinations
PDU42WB Terminal block outputs showing some possible fuse combinations
Ignition 115A 15A 15A 15A x15A
215A 15A 15A xxx
315A 15A xxxx
415A xxxxx
5N/A xxxxx
6N/A xxxxx
AND
12V Battery 115A 15A 15A 15A 15A 15A
215A 15A 15A 15A 15A x
3xx15A 15A 15A x
4xxx15A 15A x
5xxxx15A x
6xxxxN/A x
AND
Outputs on Timer 1x15A 15A 15A 15A 15A
2xxxxx15A
3xxxxx15A
4xxxxx15A
5xxxxxN/A
6xxxxxN/A
60A 60A 60A 60A 60A 60A
TOTAL ACTUAL LOAD

Part NO: 212-0024WB 7July 30th, 2019
Figure 3 - Input and High current output wiring diagram
Connecting the Battery Input (+12V IN) to the PDU
Figure 3 shows a typical wiring connection to the battery, both the +12V IN (input) and
GROUND IN (input) are wired directly to the battery terminals. This is the “best” method of
supplying reliable power to the installed equipment. If a good “solid” chassis Ground is availa-
ble then the GROUND IN terminal may be connected to the vehicle chassis close to the in-
stalled PDU. The interconnect wires must be 6 AWG if the installation power distribution will
be at or close to the maximum rating of the PDU (see specifications).
1. Run a 6 AWG wire lead from the Battery via a fusible link or circuit breaker rated at 80A to
the PDU42WB.
2. Cut the wire to length and strip 1/2” length of insulation from the end of the wire, insert the
bare wire into a suitable ring terminal (these are not provided the ring hole must clear a 1/4”
bolt), crimp or solder..
3. Connect as shown in Figure 3.
Connecting ground input to the PDU
1. Run a 6 AWG wire lead to the chassis of the vehicle, if necessary run this wire directly to
the battery negative terminal if a good low resistance chassis connection is not available
2. Prepare the 6 AWG Ground wire for connection to the PDU using the same procedure as
the battery input wire.
3. Connect as shown in Figure 3.
+12V IN via 80A
circuit breaker
VEHICLE
BATTERY
High Current +12V output
i.e. light & siren control
system
Battery voltage sense input connected directly
to battery terminals, this is necessary for “PDU
Timer” operation
1A Fuse
Battery Sense Lines

Part NO: 212-0024WB 8July 30th, 2019
SPECIAL NOTES:
1. Making a good solid ground connection to the chassis requires the removal of the paint
right down to the shiny bare metal at the point of securing the ground wire to the chassis.
2. All ground returns for equipment connected to the PDU should terminate at the PDU using
the GROUND terminal block. To minimize wire bunching and exceeding the current capac-
ity of each screw terminal on the output block (15A max per screw connection) distribute
these return wires evenly across the whole GROUND block.
Connecting the Battery Voltage Monitor from the PDU
We recommend using 18 AWG stranded wire for this connection. The color for the wires
should be RED and BLACK, however if this is not available then two distinct colors should be
used. It is very important to maintain the correct polarity from the battery to the PDU sense in-
puts.
WARNING: Any wire connected directly to the battery should be fused, and located as
close as possible to the POSITIVE battery terminal. We recommend a 1A fuse inside an
inline weather resistant fuse-holder be used.
Connecting high Current (AMP) power output from the PDU
The PDU supplies a single high current (+12V OUT) output which may be used to power a
high current device such as a light-bar, this output uses the same style of power connector as
the input wire from the battery (Figure 1). Connection to these outputs are via 8 AWG power
wires terminated with a ring terminal. This output is rated at 30A DC continuous current and
fused by a 50A MAXI fuse (MAX50 or AMT50 are the part numbers for this fuse).
1. Leave the fuse out until the attached equipment is properly wired and secured.
2. If a single connection (one power and one ground) is to carry the full current then the wires
must be 8AWG in size. Otherwise the wire supplied by the manufacturer for the equipment
will be used to connect to these output power clips.
3. Run the wire from device (i.e. light and siren controller) to the PDU mounting location. Us-
ing the same process for the Battery input wire (steps 2 and 3).

Part NO: 212-0024WB 9July 30th, 2019
Connecting the ground output (GND) from the PDU
This output ground connection is the return path for the device/equipment connected to the
+12V OUT from the PDU.
1. Run the ground wire from device (i.e. light and siren controller) to the PDU mounting loca-
tion.
2. Prepare the wire in the same manner as the “+12V OUT” and insert the wire.
Connecting the Ignition Control to the PDU
To activate the ignition control and timed outputs feature, the PDU must receive a control sig-
nal from the vehicle.
1. The installer must locate the ignition output from the vehicles wiring harness and run an 18
AWG wire from this point to the ignition input (IGN IN) on the PDU.
Care must be taken to connect the correct ignition control wire from the vehicle wiring har-
ness, some of the newer vehicles have more than one type of ignition control wires. The in-
staller must consult the factory specifications and wiring diagrams for the vehicle that is
being retrofitted with the equipment and this PDU.

Part NO: 212-0024WB 10 July 30th, 2019
Connecting the power output from the PDU
Determine the type of power required by the connecting equipment (i.e. ignition controlled,
constant/battery or timed) and start connecting the vehicle equipment according to the system
design requirements.
1. All power connections will terminate at the PDU, bring the POWER and GROUND
(return) wires for the equipment to be connected directly to the PDU.
2. Connect the power wire form the equipment to the appropriate output on the PDU (i.e. ig-
nition controlled, constant/battery or timed).
3. Connect the return wire from the equipment to one of the terminals screws on the
GROUND terminal block or any chassis GROUND.
 As you install the equipment distribute the many ground return wires to be connected
to terminal block evenly over the entire group of 5 terminal screws.
 It is highly recommended that connecting wires to the screw terminals on the
GROUND terminal block be terminated with spade/fork terminals to make neat relia-
ble connections.
1. Once all the wire connections to and from the PDU are completed the output fuses can be
installed according to the required rating of the connected equipment.
The PDU accepts a standard Automotive Blade ATO/ATC Type fuses, each fuse location has
an LED indicator to show that the fuse is in place and working. The LED indicator will glow
RED if the fuse is “GOOD” otherwise it will be off.
Setting The Time Delay on Timed Outputs
The time delay for the timed outputs is user selectable and is set by a 4 position miniature
switch that is accessible through the cover at the back of the PDU. The delay time can range
from 2 minutes to 13 hours, this function is triggered by turning the vehicle ignition “OFF”
and only if the battery voltage is lower than 14V.
When the selected time has elapsed power to all timed outputs will be shut “OFF”. If during
the timing cycle the ignition is turned back on the timer will reset and the time cycle will re-
start when the ignition is turned off again.
The PDU has a built in Voltage Monitoring circuit, this will automatically shut down any timed
outputs if the battery voltage is reaching a “CRITICAL LOW” point (11.5 VDC). Similarly
this Voltage monitor circuit will cut off power to the timed outputs if the battery voltage ex-
ceeds 18V DC.

Part NO: 212-0024WB 11 July 30th, 2019
To set the time delay follow these steps;
1. Locate the Miniature switches at the back of the PDU.
2. Refer to the attached label or Table 1 to determine the switch settings.
3. Use a pen tip or other suitably small tool to set the switches. This will select
the time increments to the output off time delay
.
Table 1 Time Delay Switch Settings
Factory Default = 2 Hours
TIME SW-1SW-2SW-3SW-4
2 MIN. ON ON ON ON
10
MIN.
OFF ON ON ON
30
MIN.
ON OFF ON ON
1 HR. OFF OFF ON ON
2 HR. ON ON OFF ON
3 HR. OFF ON OFF ON
4 HR. ON OFF OFF ON
5 HR. OFF OFF OFF ON
6 HR. ON ON ON OFF
7 HR. OFF ON ON OFF
8 HR. ON OFF ON OFF
9 HR. OFF OFF ON OFF
10 HR. ON ON OFF OFF
11 HR. OFF ON OFF OFF
12 HR. ON OFF OFF OFF
13 HR. OFF OFF OFF OFF

Part NO: 212-0024WB 12 July 30th, 2019
Timed Modes of Operation
Battery Voltage:
A) Between 14.0 to 18V the output of the “PDU Timer ” will be ON unconditionally.
B) If the battery voltage drops below 14.0V and the ignition is OFF, the “PDU Timer” will
commence a predetermined countdown delay at the end of which the unit will shut-off and
go into “STANDBY” mode. This delay is set by the 4 DIP switches on the “PDU Timer” ,
THE FACTORY DEFAULT IS TYPICALLY SET TO 2 hours (DIP switch 3 =OFF all
others on). Check and set this accordingly.
C) If the battery voltage recovers and is raised above 14.0V (i.e.. the battery is being charged)
the countdown process will cease and the “PDU Timer” will go into “ON” mode
Ignition:
A) If the ignition switch is OFF and the unit is in countdown mode, cycling the ignition switch
ON/OFF will reset the countdown. Always at the end of the countdown the “PDU Timer”
will be in “STANDBY” mode.
B) The ignition switch “ON” will always reset the countdown and prevent it from timing down
(override countdown mode and keep the “PDU Timer” ON).
Override:
The override circuit can be triggered by the PB (push button) momentary on switch on the
“PDU Timer” . Triggering the override will send the unit into “ON” mode for “2” minutes re-
gardless of the operating mode, or battery voltage (providing battery is not completely dead
and the ignition is off).
Standby:
Once the “PDU Timer” is in STANDBY mode, the only way for the system to come out of
STANDBY is;
A) Override Switch is pressed
B) Battery is charging and the battery voltage is over 14V.
C) Ignition switch is switched ON.
LED Indicator:
The LED indicator shows the mode or status by the following indications;
A) STANDBY – LED blinking at the rate of 10% ON 90% OFF.
B) ON - LED ON solid
C) COUNTDOWN - LED blinking at the rate of 90% ON 10% OFF

Part NO: 212-0024WB 13 July 30th, 2019
Warning
Maintenance
The PDU42WB does not require user maintenance except for the individual fuse replacement.
There are no user maintained parts. Do not attempt to open or repair.
Contact your local distributor or D&R Electronics for repair.
The following replacement parts and accessories are available for the PDU 42WB.
PARTS LIST
PART NUM-
BER
QUAN-
TITY
DESCRIPTION NOTES
PDU42WB 1POWER
DISTRIBUTION UNIT
212-0024WB 1PDU 42WB OPERATION / IN-
STALLATION
MANUAL

Part NO: 212-0024WB 14 July 30th, 2019
Troubleshooting
PROBLEM POSSIBLE CAUSE SOLUTION
No power at any of the out-
puts
No relay “click”
No power to “12V INPUT”
Faulty ground
Faulty Unit
Check 12V INPUT connection for
loose or missing wires.
Check Battery fusible link or circuit
breaker, if this is faulty replace it if
it is tripped reset it.
Check Vehicle Chassis “Ground”
connection
Return Unit for repair
No power to “Ignition” cir-
cuits
No relay “click”
Ignition trigger wire not con-
nected to PDU “ignition” ter-
minal
Incorrect connection to vehicle
wiring harness
Faulty Unit
Verify “ignition” input connection
Consult the factory specifications
and wiring diagrams for the vehicle
Verify that the ignition wire re-
ceives +12V when vehicle ignition
is set to “ON” and vehicle is run-
ning.
Return unit for repair
Timed outputs not on while
ignition is “ON”
Timing cycle incorrect
Timing cycle does not end/
start and all ignition control
function “OK”
Linked to ignition control.
Timing switch settings incor-
rect
Faulty unit
Follow above process
Set switches for desired timing
Return unit for repair
No power to Individual Cir-
cuits
Fuse Blown
Faulty Circuit
Replace fuse
Return Unit for repair

Part NO: 212-0024WB 15 July 30th, 2019
Specifications
General
Description No. of Available Connections
Power Inputs:
6 AWG +12V @ 60A max input current 1
6 AWG Ground 1
18 AWG Ignition Control Input 1
Power Output (High Current Connection)
8 AWG @ 30A Max +12V (fused at 50A) 1
8 AWG Ground 1
Battery Voltage Monitor
18 AWG sense wire @ +12V BATT terminal 1
18 AWG sense wire @ GND BATT terminal 1
Terminal Block Power Outputs
Ignition Controlled Power - 70A relay the total current not to exceed 40A 6
Continuous Power - the total current not to exceed 60A 6
Timed Power - the total current not to exceed 60A 6
Ground return path for the Output terminal blocks the total return current not
exceed 60A
5
NOTE: All combined output power (using any combination of outputs) not
to exceed 60A
Timed Outputs With Voltage Protection Specification
Operating Voltage (monitored/allowed by protection feature) 11.5V—18V
Stand-by Current 30mA
Operating Current 600mA
Selectable Time Delay 2 min. - 13 hrs.
Input Voltage Low Sensing Threshold >14.0V
Input Voltage Low Disconnect <11.5V
Input Voltage High Disconnect >18.0V

Part NO: 212-0024WB 16 July 30th, 2019
D & R Electronics warrants its new products to be free from defects in material and workmanship, un-
der normal use and service for a period of one year on parts replacement.
This warranty applies only to original purchasers acquiring the product directly from D&R Electronics,
or its authorized dealers. Warranty will not be recognized without proof of purchase or bill of sale.
This warranty is not transferable.
The warranty begins on the date of delivery to the first user/purchaser.
This warranty shall not apply to products which must be repaired due to normal wear and tear, negli-
gence, improper installation, abuse, misuse, or which have been altered or modified at a facility other
than D & R Electronics, or its authorized depot centers.
Units proved to be defective within the warranty period, based on an examination by D&R Electronics,
will be replaced or repaired at D & R Electronics’ option. This warranty does not cover travel expenses
or labor charges for removal or installation.
Lamps, flash tubes, batteries or other items considered consumables are not covered under warranty.
This warranty is in lieu of all other express warranties. D&R Electronics makes no warranties, ex-
pressed or implied, other than the express warranties contained herein.
WARRANTY
PRODUCT RETURN POLICY
In order to provide you with faster service, product returns for repair or replacement, must have a Re-
turn Goods Authorization Number (RGA number). Please contact our company to obtain a RGA
number before you return the product to D & R ELECTRONICS. Write the RGA number clearly on the
package. Be sure you use sufficient packing materials to avoid damage to the product being returned
while in transit.
D & R ELECTRONICS assumes no responsibility or liability for expenses incurred for the removal
and/or the installation of products requiring service and/or repair. Repairing or replacing product is at
the discretion of D & R ELECTRONICS.
CANADA
8820 George Bolton Pkwy.
Bolton, Ontario L7E 2Y4
Tel: [phone]
Fax: [phone]
USA
2299 Kenmore Avenue
Building 3, Doors 11-14
Buffalo, New York 14207
Toll Free: 1-800-538-7338
www.dandrelectronics.com
D&R ELECTRONICS Co. LTD.