D&R ELECTRONICS PDU-31SS User manual

212-0024-SS 1July 30th, 2019
Automove Power Distribuon Unit
User Manual
Model:
PDU-31SS
Table of Contents
Product Overview………………………………………………………………………………………………………………………………………………………………………..……2
Introducon/Features/Technical Specicaons……….……………………………………………………………………………………………………………………….3
Warnings…………………………………………………………………………………………………………………………………………………………………………………………..4
Installaon………………………………………………………………………………………………………………………………………………………………………………………..5
Wiring Diagram………………………………………………………………………………………………………………………………………………………………………………...6
Wire Gauge Size Tables……………………………………………………………………………………………………………………………………………………………………..7
Modes of Operaon………………………………………………………………………………………………………………………………………………………………………….8
Programming Low Voltage Shutdown and Timed Shutdown……………………………………………………………………………………………………………..9
Package Contents……………………………………………………………………………………………………………………………………………………………………………10
Warranty and Product Return Policy……………………………………………………………………………………………………………………………………………...12

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Product Overview
Figure 1: PDU-31SS

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Introducon
The PDU-31SS is designed to provide automove emergency and public service vehicle equipment installers
with a solid state, single point power distribuon system for installed electrical devices. The installaon is
fast, reliable and safe. It oers programmable low baery voltage shutdown, programmable med shut-
down, power distribuon and equipment protecon. The PDU-31SS provides a direct, easily traceable route
to the input power source avoiding interfering with the vehicles factory wiring harnesses. All circuits are in-
dividually fused (MAXI fuse for the heavy duty outputs & MINI fuses for the standard outputs) and each out-
put has a FUSE OK LED indicator for ease of troubleshoong.
Features
 Programmable Low Baery Voltage Shutdown
 Programmable Timed Shutdown
 Vehicle Baery Voltage Monitoring
 Each output has an LED fuse status indicator
 Standby Mode
 Timed Shutdown Mode
 Test Mode
 Reset Mode
 31 Outputs
Technical Specicaons
Voltage Range: 11-18 VDC
Maximum Current Load: 10A per output, fused at 15A
30A per heavy duty output, fused at 50A
100A total maximum current per PDU
Stand-by Current: 0A
Programmable Low Voltage Disconnect: Programmable from 11VDC
Factory default set at 11.5VDC (10 second delay)
NOTE: Baery manufacturers recommend to not program low voltage disconnect below 11 VDC
unless the vehicle is equipped with a second baery.
High Voltage disconnect set at 18VDC, (10 second delay)
Programmable mer setup: 1 minute - 99.59 hours.
Fuse Type: MINI fuse for regular outputs.
MAXI fuse for heavy-duty outputs.
Operang Temperature: -40° C to +65° C (-40F to +149F)
Dimensions: L 12” X W 4” X H 1.5”

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Warning
1. The use of emergency warning devices does not ensure the safety of the operator. The operator is
responsible to ensure safe operaon of the vehicle regardless of whether the warning device is in
operaon or not
2. The eecveness of this or any warning device is highly dependent on proper installaon and
maintenance. Read the manufactures instrucons before installing and follow all recommenda-
ons.
3. When in use the operator must ensure that the warning signal is visible and not obstructed by vehi-
cle components (i.e. open trunk lid), people or other obstrucons
4. This device is intended for use by authorized personnel only. It is the responsibility of the user to
ensure that all local, state, provincial and federal laws are being complied with. D&R assumes no
liability for any loss resulng from the use of this device.
5. The device must be installed so as not to reduce the output performance of vehicle systems.
6. Placement of control switches must be so as to provide convenient reach for the operator without
loosing eye contact with the road.
7. Emergency warning devices require high electrical voltages and/or currents. Properly connect and
ground all circuits. Shorng or improper grounding of this device may caused personal injuring, ve-
hicle damage and/or device damage.
8. All operators should be properly trained in the operaon of this device to ensure both operator and
public safety
9. 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 chang-
es in vehicle speed or direcon, such as braking, acceleraon or turns.
10. Be sure to mount unit through the steel of the vehicle. Avoid mounng through plasc or other non
-structural materials.
11. POINT OF INSTALLATION MUST NOT INTERFERE WITH DEPLOYMENT OF VEHICLE AIR BAGS.
12. D&R Electronics recommends that this and any of our other products be installed by qualied per-
sonnel.
13. Good wiring pracces and thorough knowledge of vehicle power systems is required by the installer
of this and any other product.
14. Looms, grommets, cable es or other installaon hardware should be used to anchor and protect
wiring.
15. All wire sizes must meet the minimum sizes specied by the manufacturer.
16. Splices should be minimized and made in a fashion so as to protect from moisture which could
cause corrosion thereby reducing conducvity.
17. The exact number of available connecons varies by applicaon. Refer to the specicaons and
typical output fusing combinaons to ensure that the safety and reliability of this product is not
compromised.
Warning
Maintenance
The PDU-31SS does not require user maintenance except for individual fuse replacements.
Do not aempt to open or repair.
Contact your local distributor or D&R Electronics for repair.

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Mechanical Installaon
The PDU-31SS may be mounted anywhere inside the vehicle away from heat, moisture or the elements.
NOTE the PDU is not weather ght. Do not mount it in the engine compartment, on the exterior of the ve-
hicle or an area where moisture, dirt or other contaminants can fall into the exposed areas of the PDU. En-
sure that the mounng locaon is at and the device is secured to solid vehicle body parts.
1. Determine an appropriate mounng locaon.
2. Conrm there is adequate access and clearance for the wiring and all connecons.
3. Secure the PDU with 4 self-tapping mounng screws (not supplied).
Electrical Installaon
12V Baery
Using appropriate size wire connect to the posive baery terminal fuse at the baery side with 100A fuse or
a circuit breaker.
Ground
Using appropriate size wire connect to the negave baery terminal or a suitable chassis ground.
Ignion Sense
Connect this terminal to the vehicle ignion switch using 18 gauge wire.
Baery Sense
Connect this terminal directly to the posive of the baery using a 18 gauge wire fused with a 5A fuse.
Ground Sense
Connect this terminal to the negave side of the baery or a suitable chassis ground.
Outputs
The PDU oers the following outputs. (1) 25A in group 1, (5) 10A in group 1, (12) 10A in group 2, (5) in igni-
on and (8) directly from baery (this output is available even when the PDU is dormant).
NOTE: When the IGNITION is OFF and the main +12V power input is disconnected, the DISPLAY will
stay ON unl both mers expire or the BATTERY SENSE input is disconnected.

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Figure 2: Wiring
Wiring Diagram

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Table 1: Recommended Input Power Feed Wire Size
Max. Total Load
Current Amps
Wire Size (AWG) vs Wire Length (3% drop)
<5 . 5-10 . 10-15 . 15-20 . 25-30 .
25 #10 #6 #6 #4 #2
50 #6 #4 #2 #2 #0
75 #6 #2 #1 #0 #3/0
100 $4 #2 #0 #2/0 #4/0
Table 2: Recommended Circuit Load Wire Size
Max. Total Load
Current Amps
Wire Size (AWG) vs Wire Length (3% drop)
1-5 . 5-10 . 10-15 . 15-20 . 25-30 .
518 18 18 16 14
10 18 16 14 14 12
15 18 14 12 12 10
20 16 14 12 10 8

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Modes of Operaon
Standby Mode
In Standby Mode the PDU is dormant with zero consumpon. It awakes either by turning the ignion or by
depressing the test switch. The test switch will turn on all outputs for two minutes and if no other acon is
taken during this me, the PDU will do dormant again.
Low Baery Voltage Shutdown Mode
The PDU provides a baery protecon by turning o the outputs when the voltage reaches a pre-set value.
This seng is the same for both groups.
Timed Shutdown Mode
The PDU allows the user to set the me remaining aer the ignion switch is turned o. This seng is the
same for both groups. The 7 segment display will cycle through and indicate the me remaining for each
output group.
Test Mode
Pressing the TIME SETUP/TEST buon for at least 2 seconds will start a 20 second test mode for both output
groups.
Reset Mode
Pressing the VOLTAGE SETUP/RESET buon for at least 2 seconds will reset the PDU to STANDBY mode.
Vehicle Baery Voltage Monitoring
The vehicle baery voltage is connuously monitored.

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Programming the PDU-31SS
NOTE: If no acon is taken within 20 seconds during setup, the PDU will return to Standby Mode.
Low Voltage Shutdown Setup
The PDU-31SS’ factory default LOW VOLTAGE SHUTDOWN value is set to 11.5 VDC for both Group 1 and Group 2 out-
puts. This value can be adjusted by the user for each of the two output groups separately by following these steps:
 Tap the VOLTAGE SETUP/RESET buon. The VL GRP1 LED will turn ON and the display will show the current volt-
age set for GROUP 1 outputs. Tap the UP or DOWN buons to enter the new voltage.
 Tap the VOLTAGE SETUP/RESET buon. The VL GRP2 LED will turn ON and the display will show the current volt-
age set for GROUP 2 outputs. Tap the UP or DOWN buons to enter the new voltage.
 Tap the VOLTAGE SETUP/RESET buon again to save the new values.
Note: - When the vehicle baery voltage drops below the Low Voltage Shutdown values for GROUP 1 or
GROUP 2 outputs, the outputs for that group will be OFF uncondionally.
- The minimum shutdown voltage cannot be set below 11.5VDC unless the vehicle is being ed with
a second baery.
Timed Shutdown Setup
The PDU-31SS factory default shutdown mes are set to:
 2 minutes for GROUP 1 outputs
 2 hours for GROUP 2 outputs
This value can be adjusted by the user for each of the two output groups separately by following these steps:
 Tap the TIME SETUP/TEST buon. The TIME GRP1 LED will turn ON and the display will show the current shut-
down me set for GROUP 1 outputs. Tap the UP or DOWN buons to enter the new me delay.
 Tap the TIME SETUP/TEST buon. The TIME GRP2 LED will turn ON and the display will show the current shut-
down me set for GROUP 2 outputs. Tap the UP or DOWN buons to enter the new me delay.
 Tap the TIMER SETUP/TEST buon again to save the new values.
Note:
When the vehicle IGNITION switch is turned on, the countdown will be stopped.

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QTY Part Number Descripon
1PDU-31SS PDU-31SS unit w/ 31 out, display, dual programmable mer and voltage
1212-0024-31SS Manual PDU-31SS unit
1Designator sheet for PDU-31SS to record all setup installaon data
Package Contents
NOTE; MINI and MAXI fuses are available for purchase.

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NOTES

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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 Authorizaon 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 sucient 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 installaon of products requiring service and/or repair. Repairing or replacing product is at the dis-
creon 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
Bualo, New York 14207
Toll Free: 1-800-538-7338
www.dandrelectronics.com
D&R ELECTRONICS Co. LTD.