Larcan MXi005U Operating manual

MXi005U AMPLIFIER
TECHNICAL SERVICE MANUAL
LARCAN INC.
228 AMBASSADOR DRIVE
MISSISSAUGA, ONTARIO
CANADA L5T 2J2
PHONE: [phone]
FAX: [phone]
EMAIL: [email protected]m
PUB06-76 Rev 2
July 18, 2007

MXi005U OPERATIONS AND MAINTENANCE
CONTENTS
1MXi005U AMPLIFIER.....................................................................................................................................................1
2MXi CONTROLLER........................................................................................................................................................2
2.1 MXi005U CONTROL BOARD ASSEMBLY AND JUMPER SETTINGS .................................................................................2
2.2 REMOTE CONTROLS AND THE MXi005U FRONT PANEL ON/OFF BUTTON..................................................................4
2.3 EXTERNAL REMOTE CONTROL CONNECTIONS..............................................................................................................4
2.3.1 Remote Command Inputs.....................................................................................................................................4
2.3.2 Remote Telemetry Outputs...................................................................................................................................5
2.3.3 Remote Status Outputs.........................................................................................................................................5
2.3.4 External1 Interlock ..............................................................................................................................................6
2.4 EXTERNAL TRANSMITTER INTERLOCK .........................................................................................................................6
3AMPLIFIER INSTALLATION AND STARTUP..........................................................................................................8
3.1 BEFORE APPLYING AC TO THE UNIT ............................................................................................................................8
3.2 APPLYING AC TO THE UNIT..........................................................................................................................................8
3.3 BEFORE TURNING THE AMPLIFIER ON .........................................................................................................................9
3.4 AMPLIFIER ON SEQUENCE............................................................................................................................................9
3.4.1 Turning ON MXi Amplifier..................................................................................................................................9
4TEST AND TROUBLESHOOTING .............................................................................................................................10
4.1 BENCH TEST PROCEDURES .........................................................................................................................................10
4.1.1 Front-End Module Bench Test Procedure.........................................................................................................10
4.1.2 IPA1 Bench Test Procedure...............................................................................................................................10
4.1.3 Pallet 21B1751 Bench Test Procedure..............................................................................................................10
4.2 BASIC TROUBLESHOOTING TECHNIQUES ....................................................................................................................11
4.2.1 Amplifier Completely OFF.................................................................................................................................11
4.2.2 No RF Output.....................................................................................................................................................11
4.2.3 Output Reduced to 25%.....................................................................................................................................11
5MAINTENANCE.............................................................................................................................................................12
5.1 DAILY.........................................................................................................................................................................12
5.2 MONTHLY...................................................................................................................................................................12
5.3 SEMI-ANNUALLY AND ANNUALLY.............................................................................................................................12
5.4 TRANSMITTER COOLING SYSTEM ...............................................................................................................................12
6TEST EQUIPMENT SETUP..........................................................................................................................................13
7SPECIFICATIONS .........................................................................................................................................................14
7.1 ELECTRICAL ...............................................................................................................................................................14
7.2 ENVIRONMENTAL .......................................................................................................................................................14
7.3 COOLING ....................................................................................................................................................................14
7.4 DIMENSIONS...............................................................................................................................................................14
7.5 SHIPPING WEIGHT ......................................................................................................................................................14
FIGURES
FIGURE 1MXI005U AMPLIFIER HEATSINK ASSEMBLY................................................................................................................1
FIGURE 2MXI CONTROLLER........................................................................................................................................................2
FIGURE 3MXI FRONT PANEL .......................................................................................................................................................2
FIGURE 4REMOTE COMMAND INPUTS..........................................................................................................................................5
FIGURE 5REMOTE TELEMETRY OUTPUTS ....................................................................................................................................5
FIGURE 6REMOTE STATUS OUTPUTS ...........................................................................................................................................6
FIGURE 7REAR PANEL SHOWING INTERLOCK TERMINAL BOARD................................................................................................8
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FIGURE 8TEST EQUIPMENT SETUP.............................................................................................................................................13
FIGURE 9MXI005U CONTROLLER BOARD ASSEMBLY ..............................................................................................................15
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MXi005U OPERATIONS AND MAINTENANCE
1 MXi005U AMPLIFIER
The RF section of the MXi005U Amplifier consists of a heatsink assembly that includes three cascaded
broadband amplifier modules and a directional coupler. Figure 1 shows the layout of this assembly.
Figure 1 MXi005U Amplifier Heatsink Assembly
Also mounted on the heatsink is a thermal switch that protects the amplifier from over temperature conditions.
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MXi005U OPERATIONS AND MAINTENANCE
2 MXi CONTROLLER
The MXi control board (Assembly 31C1897) is a single-circuit assembly that provides all of the control functions
required for the MXi series of transmitters on a single circuit board. This board can be configured for a number of
different transmitter types, power levels, transmission standards and options.
Figure 2 MXi Controller
The MXi control board provides local front panel interface via ON/OFF and RESET buttons. The board
implements controls/status/telemetry for remote control through a rear panel connector that will interface to a
typical remote control systems (such as Moseley or Gentner). An RS232 serial port is also provided to allow the
operator to access the MXi through an external computer (with the appropriate software). The MXi control board
has RF detectors for forward and reflected power and all the circuitry to support AGC/VSWR/Cutback functions.
Circuitry to control and monitor the +28V power supply is also included on this board.
Figure 3 MXi Front Panel
2.1 MXi005U CONTROL BOARD ASSEMBLY AND JUMPER SETTINGS
Figure 9 shows the assembly diagram for the control board (Part No 31C1897A2) that is used in the MXi005U
transmitter. There is only a single control board in this transmitter that performs all the control, monitoring, RF
detection and communication functions.
There are a number of jumpers on this board that are factory set and should not be altered in the field without
consulting Larcan Technical Services first. Changing the jumper settings may result in improper operation of the
transmitter.
The factory jumper settings are given here in the case that either a jumper is dislodged during shipping or has
been removed for any other reason.
Note: This circuit board is used for a number of transmitter models and a number of components and jumpers are
not installed or used for the MXi005U application. We will only detail the jumpers that are used in this application.
E1 BDM Enable
Allows connection of the BDM program cable to the board
Setting = NORM for all MXi005U transmitters
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MXi005U OPERATIONS AND MAINTENANCE
E2 Not used in the MXi005U transmitter
Setting = no jumper installed
E3 Not used in the MXi005U transmitter
Setting = no jumper installed
E4 Not installed in this assembly
E5 Front Panel ON/OFF button Mode
This jumper determines the function of the Front Panel ON/OFF button
If E5 is in the ‘INT’ position, Remote ON/OFF Controls are disabled, Local Controls Only
If E5 is in the ‘EXT’ position, Remote ON/OFF Controls are enabled, Local OFF Control Only
More detail on this function is given in Section XX of this manual
Setting = EXT for all MXi005U transmitters
E6 Transmitter Switching Interlock
This may have either a two pin header or may be permanently jumpered with bus wire
If there is a two pin header, then it requires a shorting jumper
If this is not shorted, then the transmitter will not turn ON.
Setting = Jumper installed
E7 Not used in the MXi005U transmitter
Setting = no jumper installed
E8 Not installed in this assembly
E9 Not installed in this assembly
E10 Not installed in this assembly
E11 Forward Power Sample Gain
Sets either High or Low gain from the DC sample received from the RF coupler
Set to obtain a voltage between 4.5 and 8V at TP2 for full power RF output
Can be either in the HI or LO position depending on channel and RF coupler
Typical Setting = LO for most MXi005U transmitters
E12 Not installed in this assembly
E13 Not installed in this assembly
E14 Not installed in this assembly
E15 Reflected Power Sample Gain
Sets either High or Low gain from the DC sample received from the RF coupler
Set to obtain a voltage between 4.5 and 8.0V at TP4 for 10% reflected power
Can be either in the HI or LO position depending on channel and RF coupler
Typical Setting = HI for most MXi005U transmitters
E16 AGC Disable
This jumper disables the AGC circuitry
DO not install this jumper. It is meant for factory setup
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Setting = not Installed for all MXi005U transmitters
E18 Direct Vswr Relay reset from the Remote Reset Command
This jumper allows the Remote Reset Command to directly clear the VSWR trip relay
Setting = Installed for all MXi005U transmitters
E19 Forward Power Detection Type
Setting = PK for all MXi005U transmitters
2.2
2.3
2.3.1
REMOTE CONTROLS AND THE MXi005U FRONT PANEL ON/OFF BUTTON
The Front Panel ON/OFF button on the MXi transmitter can function in two distinct modes which depends on the
position of jumper E5 on the 31C1897 control board located inside the MXi transmitter chassis. E5 that can be
placed in either of two positions, one labeled ‘INT’ and the other position EXT.
When the jumper E5 is in position INT, then the transmitter will ignore any ON or OFF remote controls. This
remote controls can either come from the serial communication program or from the external remote control
connector on the rear of the MXi transmitter chassis. Please note that only the ON and OFF remote controls are
disabled and the AGC raise/lower and Vswr reset commands will still be operational. In this mode the transmitter
can only be turned ON or OFF via the front panel button. This is mostly for maintenance purposes when the
technician is working on the transmitter and doesn’t want anyone to remotely turn it ON or OFF.
When jumper E5 is in the EXT position then remote controls are enabled, this is the normal factory setting as
shipped. Even when E5 is in the ‘EXT’ position, the front panel button will still shut the transmitter OFF if it is
placed in the OFF position but when the front panel button is pressed in then the remote ON/OFF controls are
enabled. The MXI transmitter records the last known requested ON/OFF state from the remote control and will
cause the transmitter to enter into that state. If the operator last issued a remote OFF command then the remote
state of the transmitter would be OFF and if the operator last issued an ON command then the remote state of the
transmitter would be OFF. This is done to insure that when remote control is enabled and an AC power failure
occurs, then upon restoration of AC power the transmitter will return to the ON/OFF state is was in prior to the AC
power failure. This is necessary since the remote ON/OFF commands are momentary closures and are not
present all the time.
EXTERNAL REMOTE CONTROL CONNECTIONS
External remote controls are intended to interfacing to a third party remote control vendor such as Moseley or
Gentner if such systems are installed or available at the transmitter site. These external controls function in
parallel with the serial remote commands implemented with the Larcan supplied remote control program.
These remote signals are available on the 15-pin D-connector labeled Telemetry on the rear panel of the
MXi005U transmitter. The remote controls can be broken down into four categories, control inputs, status
outputs, telemetry outputs and interlock as follows:
Remote Command Inputs
There are only three remote commands available to the operator, these being TX ON, TX OFF and VSWR Reset.
In the table of remote signals, all remote commands have an RC_prefix.
All remote controls are active low, opto-isolated inputs configured as shown at left, all of which require a GROUND
for assertion and the activator to be able to sink 15mA or more for at least 200ms to accomplish reliable keying.
Each of these is current-limited by an individual resistor. A ground reference pin is provided at pin 12 to ease the
interface task since all these remote commands are active low and require a short to ground.
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MXi005U OPERATIONS AND MAINTENANCE
Figure 4 Remote Command Inputs
2.3.2 Remote Telemetry Outputs
There are only four remote telemetries available to the operator, these being RF forward power, RF reflected power,
AGC voltage and Cutback voltage. In the table of remote signals, all remote commands have a RT_ prefix.
The only further note on the telemetry outputs concern the AGC and Cutback telemetry levels. These levels are
normally sent to the PreAmp attenuator and range from 0V to about 10V. The circuit that generates these
telemetries for the remote interface only has a range of 0V to 5V and so the values of these two telemetries are
actually half of their true value. That is an AGC telemetry reading of 2.3V actually represents an AGC voltage
level to the PreAmp attenuator of 4.6V.
All telemetry outputs of the transmitter are designed to operate between zero and +5V, referenced to ground.
Where possible and practical, factory calibration is standardised on 100% normal power or 100% normal voltage as
applicable, and adjusted to deliver +4V to the appropriate telemetry output. All come from op-amps that can supply
only a few mA. A ground reference pin is provided at pin 12 to ease the interface task since all these remote
commands are active low and require a short to ground.
Figure 5 Remote Telemetry Outputs
2.3.3 Remote Status Outputs
There are only two remote statuses available to the operator, these being transmitter ON and an Error status. In the
table of remote signals, all remote status have a RS_ prefix.
The transmitter ON status is a relay contact that with one side of the contact connected to ground. When the
transmitter is in the ON state, this relay closes providing a path to ground to the RS_TXON signal. Thus when this
status sinks current to ground, it indicates that the transmitter is ON.
The transmitter Error status is also an active low current sink to ground, but is implemented with the output transistor
of an opto-isolator as shown in the diagram below. When the transistor sinks current to ground, it indicates that there
is some fault condition with the transmitter. This fault is an indication to the operator that there is some problem with
the transmitter (such as a VSWR trip, Interlock open or Power supply problem) that needs some attention. A ground
reference pin is provided at pin 12 to ease the interface task since all these remote commands are active low and
require a short to ground.
The Error status is a current sinking open collector output that comes directly from the NPN transistor outputs of the
opto-isolator devices. The available output sink current is dependent on the opto-isolator transfer ratio. Generally,
one can expect at least 20mA of sinking current for each output listed here. Because these are open collector, they
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can be connected to maximum 30 VDC output. The active (true) condition whether high or low will depend on the
specific status output.
Figure 6 Remote Status Outputs
2.3.4
2.4
External1 Interlock
There is a pair of terminals on the D-connector that is used for an external interlock to interface to any site alarms or
shutdown conditions. These pins would expect a dry contact that is closed when there is no error condition. This
External #1 interlock is in parallel with the two pin terminal block on the rear of the MXi transmitter chassis. The MXi
applied its own +12V to one side of this interlock (the Ext1+ line) and will sense this +12V on the other interlock side
(the Ext1- line).
REMOTE SIGNAL PIN# DESCRIPTION
RC_TXON 1 Control, Transmitter ON
RC_VSWRRst 2 Control, VSWR Reset
RS_TXON 3 Status, Transmitter ON
Spare [Unused] 4
RT_FwdPwr 5 Telemetry, Forward Power
Spare [Unused] 6
RT_CutBack 7 Telemetry, Cutback Voltage (1/2 Scale)
Ext1- 8 External Interlock, Normally Open
RC_TXOFF 9 Control, Transmitter OFF
Spare [Unused] 10
RS_TXErr 11 Status, Transmitter Error
Ground Reference 12 Ground Reference
RT_RflPwr 13 Telemetry, Reflected Power
RT_AGC 14 Telemetry, AGC Voltage (1/2 Scale)
Ext1+ 15 External Interlock, (+12V Armed)
EXTERNAL TRANSMITTER INTERLOCK
The MXi transmitter provides the customer a set of contacts where an external interlock can be applied to control
the ON state of the transmitter. The purpose of this interlock is to shut down the transmitter if there is sensed an
emergency condition (such as a building fire or smoke alarm) or it there is some RF output switch that is going to
be moved and the RF output of the transmitter needs to be shut off temporarily when the switch is in transit. If
there is no application for this interlock then the customer must insure that it is shorted out (i.e., closed) so that
the transmitter is enabled to be turned ON.
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The external1 interlock contacts are available in two separate locations. The first location is on the two pin terminal
block on the rear of the MXi transmitter chassis. This is the more likely and convenient place for the External1
interlock to be connected. A second parallel set of contacts is located on the 15-pin Telemetry D-connector on the
rear of the MXi transmitter chassis. Only one set of these contacts need to be closed to enable the transmitter since
they are in parallel.
These pins would expect a dry contact that is closed when there is no error condition. This External #1 interlock is in
parallel with the two pin terminal block on the rear of the MXi transmitter chassis. The MXi applied its own +12V to
one side of this interlock (the Ext1+ line) and will sense this +12V on the other interlock side (the Ext1- line).
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