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Part NO: 212-0024-8S   

                   2                                        September 24th, 2020 

 

Applicable Models 

 

PDU-8S 

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 

PDU-8S 

is directly connected to the vehicle battery and ground, thus providing a di-

rect easily traceable route to the input power source avoiding interfering with the vehicles 

factory wiring harness. The specifics for safely connecting the 

PDU-8S 

 to a vehicles 

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 

PDU-8S 

unit provides two 50A high current outputs and up to 24 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 8 output connections each with individual fuses, that are on at all time 

providing the 

PDU

 is connected to the battery. 

2) Ignition Controlled Outputs: 

The 8 output power connections, also individually fused  p12V output 

while the vehicle ignition is ON.  Power will be immediately turned OFF at these 

outputs when the vehicle is shut down and the ignition key removed (some vehi-

cles 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 sit-

uation.. 

3) Timed Outputs: 

There are 8 output power connections fit 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 us-

er selectable and is selected by the installer based on the system design. 
The 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. 

 

Summary of Contents for PDU-8S

Page 1: ... 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 ...

Page 2: ... requirements These output features have the following characteristics 1 Constant Battery Outputs There are 8 output connections each with individual fuses that are on at all time providing the PDU is connected to the battery 2 Ignition Controlled Outputs The 8 output power connections also individually fused provide 12V output while the vehicle ignition is ON Power will be immediately turned OFF ...

Page 3: ...utput 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 operat...

Page 4: ...celeration 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 PDU 8S may be mounted anywhere inside th...

Page 5: ...ions The maximum fuse sizes and some possible combinations are shown in a table on the following page Figure 2 The fuses are indicated as 20A maximum 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 equipmen...

Page 6: ...20A 20A 2 x x 20A 20A 20A 3 x x x 20A 20A 4 x x x x 20A 5 x x x x N A 6 x x x x N A 7 x x x x N A 8 x x x x N A 12V BATTERY 1 20A 20A 20A 20A 15A 2 20A 20A 20A 20A 15A 3 20A 20A 20A 20A 15A 4 20A 20A x 15A 15A 5 N A N A x 10A 15A 6 N A N A x N A 15A 7 N A N A x N A N A 8 N A N A x N A N A AND IGNITION 1 20A 20A 20A 20A 20A 2 20A 20A 20A 20A 20A 3 20A 20A 20A x 15A 4 20A 20A x x 15A 5 N A x x x 15A...

Page 7: ...a fusible link or circuit breaker rated at 80A to the PDU 8S 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 neces...

Page 8: ...d 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 outputs from the PDU The PDU supplies two high current 12V OUT outputs which may be used to power high current devices such as a lightbar or siren and light control system this output uses the same style of powe...

Page 9: ...l 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 new...

Page 10: ...tions 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 ...

Page 11: ... will select the time increments to the output off time delay Table 1 Time Delay Switch Settings Factory Default 2 Hours TIME SW 1 SW 2 SW 3 SW 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...

Page 12: ... 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 t...

Page 13: ...Part NO 212 0024 8S 13 September 24th Maintenance The PDU 8S does not require user maintenance except for the individual fuse replacement ...

Page 14: ...DU 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 en...

Page 15: ...er the total current not to exceed 60A 8 Continuous Power the total current not to exceed 60A 8 Timed Power the total current not to exceed 60A 8 Ground return path for the Output terminal blocks the total return current not exceed 60A 7 NOTE All combined output power using any combination of outputs not to exceed 60A Timed Outputs With Voltage Protection Specification Operating Voltage monitored ...

Page 16: ...es 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 r...

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