Brandywine PDU-240 User manual

MANUAL P/N 900000154 REV A
User Guide
Pulse Distribution Unit
Model PDU-240
P/N 018000501
Revision B
June 2017
Brandywine Communications
1153 Warner Avenue
Tustin, CA 92780
[phone]
[phone]
http://www.brandywinecomm.com/

MANUAL P/N 900000154 REV B
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Revision History
REVISION
DATE
COMMENTS
A
5-20-2016
Original release of PDU-240 user guide.
B
9-21-2017
Added information on fuse replacement

MANUAL P/N 900000154 REV B
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Safety Warnings
WARNING: This unit contains lethal AC voltages.
Disconnect the unit from the AC supply before removing
the cover.
WARNING:
The lightning flash with an arrowhead inside of an equilateral triangle is
intended to alert the user to the presence of un-insulated “dangerous
voltage” within the product’s enclosure. The “dangerous voltage” may be
of sufficient magnitude to constitute as a risk of electrical shock to people.
CAUTION:
The exclamation point inside of an equilateral triangle is intended to alert
the user to the presence of important operation and maintenance
instructions in the user guide.

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Table of Contents
1 Specifications..................................................................................................5
1.1 Inputs........................................................................................................5
1.1.1 Reference Pulse Input......................................................................5
1.1.2 Fault Discrete (Optional)..................................................................5
1.1.3 Fault/Status.......................................................................................5
1.2 Outputs.....................................................................................................6
1.2.1 Reference Pulse Output...................................................................6
1.3 Switches and Indicators............................................................................7
1.3.1 Status LED Indicators......................................................................7
1.3.2 Environmental ..................................................................................7
1.3.3 Power ................................................................................................7
1.3.4 Physical.............................................................................................7
2 Option Configuration Sheet.............................................................................8
3 Unpacking and Installation ..............................................................................9
3.1 Unpacking.................................................................................................9
3.2 Installation.................................................................................................9
3.3 Connections............................................................................................10
3.3.1 Alarm Input Connection.................................................................10
4 Operation.......................................................................................................11
4.1 Powering the PDU-240...........................................................................11
4.2 Selecting the Input Reference.................................................................11
4.3 Fault Indicator.........................................................................................11
5 Maintenance and Troubleshooting ................................................................12
6 Calibration.....................................................................................................13
7 Drawings .......................................................................................................14

MANUAL P/N 900000154 REV B
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1 Specifications
1.1 Inputs
1.1.1 Reference Pulse Input
Pulse: 1 PPS through 10Mhz
Input Levels
o1 level : 2.5V min, 10.5V max
o0 level : 0.25V max
Input Impedance: 50 ohm or 10k ohm. Settable by link, see figure 1
Number of Inputs: 2 with auto selection and manual override from the
front panel toggle switch
Connector Type: BNC
1.1.2 Fault Discrete (Optional)
Number of Inputs: 2
Level: TTL
Active low
Forces a changeover when active for online reference
1.1.3 Fault/Status
Connector Type: DB-9 Female
Mating Connector: AMP P/N 747904-2
Figure 1

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1.2 Outputs
1.2.1 Reference Pulse Output
Number of Outputs: 24
Connector Type: BNC
Output Protection: short circuit proof
Output Level: o1 level: 5V±5% into 50 ohms (10V ±5%
settable with link)
oOptional 1 level: 2.5V into 50 ohm
o0 level: 0.25V max into 50 ohm
Rise Times (10% to 90%)
o0-10V 20ns
o0-5V 15ns
o0-2.5V 10ns
Cross talk: -80 dBc
Spurious: -60dBc
Figure 2

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1.3 Switches and Indicators
1.3.1 Status LED Indicators
Power (Green)
Reference Input A Available (Green)
Reference Input A Online (Green)
Reference Input B Available (Green)
Reference Input B Online (Green)
lAutomatic Reference Selection Selected (Green)
Fault (Red)
1.3.2 Environmental
Temperature:
oOperating: -30 to +60C
oStorage: -40 to +85C
Humidity: 10 - 95% non-condensing
1.3.3 Power
115/230 VAC 50/60 Hz
< 25 W
Fuse Value: T1, 250V, 1A
1.3.4 Physical
1.72” H x 14.5” D x 17.00” W and 1U 19” rack mount
Weight: 7.5 lbs nominal
1.3.5 Input detection time
Setting input available LED time.
oThe detection time in seconds can be adjusted for low frequency
pulses. Set with DIP switch on LED board. Figure 3
1PPS: default at 1 second
10PPS: set to 10 second
1PPM: set to 60 second
Figure 3

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2 Option Configuration Sheet
Configuration Options
2.1 Base Unit
Part Number
2 switched input 24 output 10V level
018000501
2 switched input 24 output 5V levels
018000502
2 switched input 24 output 3.3V levels
018000503
2 independent input 12 output
Group 1 10V
Group 2 10V
018000504
2 independent input 12 output
Group 1 10V
Group 2 5V
018000505
2 independent input 12 output
Group 1 10V
Group 2 3V
018000506
2 independent input 12 output
Group 1 5V
Group 2 5V
018000507
2 independent input 12 output
Group 1 5V
Group 2 3V
018000508
2 independent input 12 output
Group 1 3V
Group 2 3V
018000509
Power Supply Options
85 - 265 VAC 50/60 Hz
018001000
36 - 72VDC Isolated
018001001
18 - 36VDC Isolated
018001002
9 - 18 VDC Isolated
018001003

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3 Unpacking and Installation
3.1 Unpacking
Carefully remove the PDU-240 from its shipping carton. The following items
should be included in the shipment:
1 PDU-240
1 power cord
1 user guide
Note the power entry module on the rear of the PDU-240 chassis. Please take
note of the voltage displayed on the rear of the power entry module and verify
that the voltage matches the local line’s voltage.
WARNING:
REMOVE THE POWER CORD FROM THE PDU-240 BEFORE
ADJUSTING THE LINE VOLTAGE.
CAUTION:
THE PDU-240 WILL BE DAMAGED IF THE INCORRECT AC
LINE SETTING IS USED.
If the AC line setting is incorrect, detach the power cord from the power entry
module. Use a small screwdriver to lift up the fuse cover on the power entry
module to remove the fuse holder. Reverse the fuse holder and re-insert the
fuse holder, making sure that the correct AC line voltage is now displayed on the
rear panel.
3.2 Installation
The PDU-240 should be bolted directly into a 19” rack mount enclosure or
mounted on a shelf. The PDU-240 when fully populated has up to 27 cables
attached to the rear panel, therefore it is recommended that some appropriate
cable strain-relief system be used to support these cables, particularly when the
unit is not supported by a shelf.

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3.3 Connections
Insert the power cord provided in the shipment into the rear power entry module.
Connect the input reference signals to the appropriate connectors on the rear
panel.
NOTE:
FOR CORRECT OPERATION, REFERENCE PULSE A
AND REFERENCE PULSE B MUST BE THE SAME
PULSE RATE, WHICH IS TYPICALLY 1 PPS.
Connect the output cables to the desired output connectors. Any unused
connectors may be left un-terminated.
3.3.1 Alarm Input Connection
The PDU-240 may be used with an external reference such as the Brandywine
Communications GPS8 or PTS system that incorporates a discrete alarm signal.
This alarm signal is used to indicate a fault (e.g. rubidium out of lock) on the
reference signal, although the 1 PPS input signals may be present.
The factory standard PDU-240 configuration is a logic HI signal on the ALARM IN
pin indicating that the input is GOOD. A built in pull-up resistor ensures that if no
ALARM IN connection is made the reference is considered good.