Nautel NV5 Programming manual

NV5/NV3.5 Transmitter
Troubleshooting Manual
Document:NHB-NV3.5-NV5-TRB-3.2
Issue: 3.2 2014-12-10
Status: Standard

Nautel Limited
10089 Peggy’s Cove Road
Hackett’s Cove, NS Canada B3Z 3J4
Phone: [phone] or
Toll Free: +1.877.6NAUTEL (6628835) (Canada & USA only)
Fax: [phone]
Nautel Inc.
201 Target Industrial Circle
Bangor, Maine USA 04401
Phone: [phone]
Fax: [phone]
Customer Service (24 hour support)
+1.877.628.8353 (Canada & USA only)
+1.902.823.5100 (International)
Email: [email protected]
Web: www.nautel.com
The comparisons and other information provided in this document
have been prepared in good faith based on publicly available
information. The reader is encouraged to consult the respective
manufacturer's most recent published data for verification.
© Copyright 2014 NAUTEL. All rights reserved.

NV5/NV3.5 Troubleshooting Manual Table of contents
Page v
Contents
Release control record vii
Responding to alarms 1-1
Corrective maintenance 1-1
Electrostatic protection 1-3
Identifying an alarm 1-4
Troubleshooting tips 1-23
Removing and reinstalling RF power modules 1-29
Using the RF power module extension test jig 1-31
Troubleshooting RF power modules 1-33
Control/interface PWB replacement 1-39
Remote interface PWB replacement 1-40
LVPS Replacement 1-40
+12 V Power Supply Replacement 1-42
Fan, IPA and Module Power Supply Replacement 1-43
Using the power supply extension assembly 1-44
Single-Board Computer (SBC) Replacement 1-46
Detailed Circuit Descriptions 2-1
Control/interface PWB (NAPC156A) 2-1
Remote interface PWB (NAPI115A) 2-2
RF power module (NAA56/01D) 2-3
Parts Lists 3-1
Parts information 3-1
Family tree 3-1
How to locate information about a specific part 3-1
Column content 3-2

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OEM code to manufacturer’s cross-reference 3-3
Common abbreviations/acronyms 3-4
Wiring/connector lists 4-1
Wiring lists provided 4-1
Wiring lists not provided 4-1
Connector mating information 4-1
Wire colours 4-1
Printed wiring board patterns 4-1
Reading Electrical Schematics 5-1
Component values 5-1
Graphic symbols 5-1
Logic symbols 5-1
Reference designations 5-1
Unique symbols 5-2
Identifying schematic diagrams 5-2
Structure of schematics 5-2
Locating schematic diagram(s) for a functional block 5-3
Locating a part or assembly on a schematic 5-3
Mechanical Drawings 6-1
Identifying mechanical drawings 6-1
Content of mechanical drawings 6-1
List of terms 7-1

NV5/NV3.5 Troubleshooting Manual
Issue 3.2 2014-12-10 Page vii
Release control record
Issue Date Reason
3.0 2011-11-10 Release 3 of product (NARF50B)
3.1 2012-10-01 Table 1.1: Troubleshooting Alarms - updated alarm
descriptions
Table 4.3: For 1-phase ac input, changed destination
of wire # 4 to TB2-2A1.
3.2 2014-12-10 Section 1: added step 1 to Troubleshooting Tips for
AUI Screen Lockup (supports software release 4.2.7
or later)

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Issue 3.2 2014-12-10 Page 1-1
Section 1: Responding to alarms
This section provides instructions you need when performing troubleshooting on the NV5/NV3.5
transmitter. This section includes the following topics:
•Corrective maintenance
•Electrostatic protection - see page 1-3
•Identifying an alarm - see page 1-4
•Troubleshooting tips - see page 1-23
–AUI screen lockup - see page 1-23
•Removing and reinstalling RF power modules - see page 1-29
•Troubleshooting RF power modules - see page 1-33
•Fan, IPA and Module Power Supply Replacement - see page 1-43
If none of the procedures and alarms described in this section address your problem, contact Nautel
for assistance. See “Technical support” on page ix.
Corrective maintenance
Corrective maintenance procedures consist of identifying and correcting defects or deficiencies that
arise during transmitter operation. Local and/or remote alarm signals are generated when a
malfunction occurs. If an alarm condition is caused by a malfunction in the RF power stage, the
transmitter may maintain operation at a reduced RF output level. The nature of the fault – and station
policy – will dictate whether an immediate maintenance response is necessary. Fault analysis and
rectification may be conducted from three different levels, with a different technical competence level
required for each: on-air troubleshooting, remote or local, and off-air troubleshooting.
CAUTION:
The transmitter contains many solid state devices that may be damaged if
subjected to excessive heat or high voltage transients. Every effort must be taken
to ensure that circuits are not overdriven or disconnected from their loads while
turned on.

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On-air troubleshooting
On-air troubleshooting can be performed from a remote location, or locally at the transmitter site.
Remote troubleshooting
Remote on-air troubleshooting consists of monitoring the transmitter's radiated signal using an on-air
monitor or via a LAN connection, and observing the status of each remote fault alarm indicator.
Information obtained from these sources should enable an operator to decide whether an alarm
response may be deferred to a more convenient time, an immediate corrective action must be taken,
or if a standby transmitter must be enabled (if one is available). It is recommended that the
significance of remote indications, and the appropriate responses, be incorporated into a station's
standard operating procedures. Refer to “Identifying an alarm” on page 1-4 to determine the
remedial action required for a given fault.
Local troubleshooting
Local on-air troubleshooting consists of monitoring the transmitter's integral meters and fault alarm
indicators. Analysis of this data will normally identify the type of fault, and in most cases will
determine what corrective action must be taken. Refer to “Identifying an alarm” on page 1-4 to
determine the remedial action required for a given fault.
The power amplifier stage contains an integral modular reserve (IMR) feature. This feature permits
the transmitter to operate at a reduced RF output level when a malfunction occurs in one of its power
modules. Station operating procedures will dictate whether a reduced RF output level is acceptable.
When a reduced RF output level can be tolerated, replacement of the defective RF power module
may be deferred to a convenient time.
A defective RF power module may be removed from the transmitter for servicing, while the
transmitter is operating, provided that the conditions in the removal instructions detailed in
“Removing an RF power module” on page 1-29 are met.
Off-air troubleshooting
Off-air troubleshooting must be performed when the replacement of a defective RF power amplifier
module, or routine on-air calibration adjustments, will not restore operation.
It is recommended that the transmitter’s output be connected to a precision 50 resistive dummy
load (rated for at least the maximum transmitter power rating) before starting off-air troubleshooting
procedures. If an appropriate dummy load is not available, troubleshooting for a majority of faults
can be performed with RF power stage turned off. The transmitter may remain connected to its
antenna system for these procedures.

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Electrostatic protection
The transmitter's assemblies contain semiconductor devices that are susceptible to damage from
electrostatic discharge. The following precautions must be observed when handling an assembly
which contains these devices.
Electrical discharging of personnel
Personnel should be electrically discharged by a suitable grounding system (e.g., anti-static mats,
grounding straps) when removing an assembly from the transmitter, and while handling the assembly
for maintenance procedures.
Handling/Storage
An assembly should be placed in an anti-static bag when it is not installed in a host transmitter, or
when it is not undergoing maintenance. Electronic components should be stored in anti-static
materials.
Tools/Test equipment
Testing and maintenance equipment – including soldering and unsoldering tools – should be suitable
(i.e., grounded tip) for contact with static sensitive semiconductor devices.
Stress current protection
Every precaution should be taken to ensure the static sensitive semiconductor devices are protected
from unnecessary stress current. This is achieved by ensuring that current is not flowing when an
electrical connection is broken, and that voltages are not present on external control/monitoring
circuits when they are connected.
NOTE:
Reduce the RF output level to a minimal value when troubleshooting faults in the power
amplifier stage while the transmitter’s RF output is connected to the antenna system.
CAUTION:
Electrostatic energy is produced when two insulating materials are rubbed
together. A person wearing rubber-soled shoes, walking across a nylon carpet or a
waxed floor, can generate an extremely large electrostatic charge. This effect is
magnified during periods of low humidity. Semiconductor devices such as
integrated circuits, field-effect transistors, thyristors and Schottky diodes may be
damaged by this high voltage unless adequate precautions are taken.

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Identifying an alarm
The best way to identify an alarm is by viewing the front panel’s Transmitter Status page
(Figure 1.1). If an alarm exists, the Status button at the bottom of the AUI display will be red. Press
or click the Status button to go to the Transmitter Status page.
Figure 1.1: Transmitter Status Page
1. View the list of active faults by pressing the Alarms tab. Alarms are listed by their origin
(Device column), then by name (Alarm column), and then by severity [1 = low (RF output
not affected), 5 = medium (RF output is reduced), 10 = high (RF output is inhibited); see
Level column]. See “List of current alarms” on page 1-5.
2. Attempt to clear any latching alarms by pressing the Reset button on the bottom banner of
the page. If the alarm persists, it will not be cleared from the display.
3. Refer to Table 1.1 on page 1-7 for troubleshooting tips on the offending alarm(s), which may
also reference replacement (see Table 1.2 on page 1-22) and subsequent re-calibration
procedures. Note the origin of the alarm (i.e., contained within Controller, Exciter, or
Module # sub-system folders).

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4. If the troubleshooting and subsequent replacement of a suspect PWB or RF power module
does not remove the fault condition, contact Nautel.
List of current alarms
If an alarm exists and is being recognized by the transmitter, it is displayed under the Alarms tab of
the transmitter status page (see Figure 1.1 on page 1-4). The Device name indicates the sub-system
origin of the alarm. The sub-systems that can be displayed are:
– Controller: All alarms in this sub-system apply to the controller.
– Exciter A: All alarms in this sub-system apply to exciter A.
– Exciter B: All alarms in this sub-system apply to exciter B.
– Module #: All alarms in this sub-system apply to a specific RF power module (1 and 2).
Table 1.1 on page 1-7 contains a column for most Alarms that can occur, sorted alphanumerically for
each sub-system. The Description and Troubleshooting Action column provides a brief description
of the alarm, troubleshooting tips and a cross-reference to more detailed troubleshooting, as
applicable.
Backup monitoring LEDs
The control/interface PWB (A1) contains LEDs that provide specific status and alarm indications.
Status indications include RF ON/RF OFF, LOCAL/REMOTE and low voltage power supply status (+5V,
+15V, -15V, +12V). Alarm indications include a summary alarm (SMY ALARM) and more specific
location alarms (OUTPUT NETWORK, IPA/PA, EXCITER, POWER SUPPLY or EXTERNAL. There are
also LEDs that indicate the approximate RF output power level, from 100% down to 10% (in 10%
steps), relative to maximum RF output power for that mode of operation. The LIMIT LED indicates
that the transmitter is attempting to exceed its maximum (100%) RF output capability.
NOTE:
Before undertaking any troubleshooting, record all AUI meter readings and note if any other
alarms are displayed on the Transmitter Status page. Record all alarms. The most
convenient way to do this is by using a web browser over a LAN connection to save screen shots
of critical status, meter and alarm pages. From the System Review page, press the
information (!)button for each sub-device (Controller, Exciter and Module) to view (and save)
detailed information.

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Switching power supply LEDs
Each switching power supply contains two LEDs that provide specific status indications.
The AC OK LED indicates the status of the incoming ac source to the supply. The LED is green
when the ac source is at its normal operating level (between 175 and 180 V ac) and off when the ac
source is below an acceptable level or is not present.
The DC OK LED indicates the status of the dc output of the supply. The LED is green when the dc
output is within the adjustable range of its operation limits and off when the dc output is outside the
limits of normal operation.
Exciter LEDs
The front panel of each exciter contains two LEDs that provide specific status and alarm indications.
The upper LED indicates the status of the exciter’s operating power. The LED is on (green) when the
exciter’s logic supply is enabled and operating at an acceptable level.
The lower LED indicates the RF operating status of the exciter; it has four different appearances:
– Green: the exciter is operating normally.
– Green/ing amber: the exciter is operating (and producing RF output), but has a non-
inhibiting system fault (e.g., audio loss or low input level) and requires checking. The
transmitter will likely continue to operate.
– Amber: the exciter has been inhibited by the controller (e.g., RF mute).
– Red: the exciter has been inhibited by a fault occurring within the exciter.

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Table 1.1: Troubleshooting Alarms
Alarm (with Prefix) Description and Troubleshooting Action
Controller: +12V
Supply A (or B) Fault This alarm occurs if the +12 V supply from SBC/AUI power supply A (U1) or B (U2) is outside its acceptable voltage range (between +10.8
and +13.2 V). Use a digital multimeter to measure between +V and -V
of the suspect +12 V supply’s output voltage. If necessary, replace the
+12 V supply (see “+12 V Power Supply Replacement” on page 1-
42). If the alarm persists after replacing the supply, suspect the
control/interface PWB (A1).
Controller: +15V
Supply A (or B) Fault This alarm occurs if the +15 V supply from LVPS module A (U3) or B (U4) is outside its acceptable voltage range (between +13.5 and
+16.5 V). Use a digital multimeter to measure between V2 and COM
of the suspect LVPS output voltage. If necessary, replace the LVPS
(see “LVPS Replacement” on page 1-40). If the alarm persists after
replacing the supply, suspect the control/interface PWB (A1).
Controller: -15V
Supply A (or B) Fault This alarm occurs if the +15 V supply from LVPS module A (U3) or B (U4) is outside its acceptable voltage range (between -13.5 and
-16.5 V). Use a digital multimeter to measure between V3 and COM of
the suspect LVPS output voltage. If necessary, replace the LVPS (see
“LVPS Replacement” on page 1-40). If the alarm persists after
replacing the supply, suspect the control/interface PWB (A1).
Controller: +5V
Supply A (or B) Fault This alarm occurs if the +5 V supply from LVPS module A (U3) or B (U4) is outside its acceptable voltage range (between +4.95 and
+6.05 V). Use a digital multimeter to measure between V1 and COM of
the suspect LVPS output voltage. If necessary, replace the LVPS (see
“LVPS Replacement” on page 1-40). If the alarm persists after
replacing the supply, suspect the control/interface PWB (A1).
Controller: Active
Exciter Fail This alarm occurs when a system inhibiting fault has occurred within the active exciter. The transmitter will be latched off (or changeover to
the standby exciter, if applicable). Check for associated Exciter
prefixed alarm(s) that may have caused the failure and refer to their
troubleshooting action.
Controller: Active
Exciter Not
Responding
This alarm occurs if the active exciter is not responding to serial
messages. Check the integrity of the cable between the exciter’s TX
LINK connector and J5 or J6 (as applicable) of the control/interface
PWB. If the connection is secure, the problem is likely exciter related.
Check for associated Exciter prefixed alarm(s) that may have caused
the failure and refer to their troubleshooting action.

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Controller: Check
Active Exciter This alarm occurs when a non system inhibiting fault has occurred within the active exciter. The transmitter will likely resume operation.
Examples of such faults are IBOC data loss, fan failure, high
temperature, or an exciter low voltage power supply rail voltage is out-
of-tolerance. Check for associated Exciter prefixed alarm(s) that may
have caused the failure and refer to their troubleshooting action.
Controller: Combiner
Matching Shutdown This alarm occurs if two or more RF power modules are reporting a Module #: Output Network Shutdown alarm. The transmitter will be
inhibited until a reset occurs. The alarm is indicative of a transmitter
combiner fault. Contact Nautel.
Controller: CPLD
Compatibility Fault This alarm occurs when there is an incompatible software release in the control/interface PWB’s CPLD. Update the software to clear the
fault or contact Nautel.
Controller: Cutback This alarm occurs whenever the transmitter experiences a cutback. A
cutback (reduction in power) occurs when repeated shutback alarms
occur within a prescribed time period. Shutbacks occur when the
transmitter’s peak reflected power exceeds 2:1 (600 W for all modes)
due to a transient SWR condition (arc or lightning) within the output
transmission line or antenna system. The transmitter shuts back and
recovers to a series of cutback levels (depending on the severity of
the alarm), with each level representing a 1/8th reduction in power
from the preset value. Attempt to reset the latched condition by
pressing Reset. Inspect the output transmission line for punctures or
damage. If no damage can be found, suspect a fault with the control/
interface PWB (A1).
Controller: Disable
Module # (1 -16) This alarm occurs if one or more of the RF power modules has been disabled by the microcontroller on the control/interface PWB. This
may be caused when one or more IPA power supply failures occur,
resulting in the requirement to shut down IPAs to maintain the total
IPA current within the capabilities of the remaining IPA power
supplies. With one IPA power supply operational, this alarm should
not occur. Check for associated alarm(s) that may have caused the
failure and refer to their troubleshooting action.
Controller: EEP Fail
Configuration This alarm occurs if there is no valid EEPROM configuration data to load. Various parameters will revert back to their failsafe default
values. See “Controller: EEP Fail alarms” on page 1-24.
Alarm (with Prefix) Description and Troubleshooting Action

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Controller: EEP Fail
Meter Scales This alarm occurs if there is no valid EEPROM meter scale data to load. All calibrated meter scales will revert back to their failsafe
default values. See “Controller: EEP Fail alarms” on page 1-24.
Controller: EEP Fail
Module Thresholds This alarm occurs if there is no valid EEPROM module threshold data to load. All module threshold values will revert back to their failsafe
default values. See “Controller: EEP Fail alarms” on page 1-24.
Controller: EEP Fail
Remotes This alarm occurs if there is no valid EEPROM remote data to load. All configurable remote input/output settings will revert back to their
failsafe default settings. See “Controller: EEP Fail alarms” on page 1-
24.
Controller: EEP Fail
Thresholds This alarm occurs if there is no valid EEPROM threshold data to load. All controller threshold values will revert back to their failsafe default
values. See “Controller: EEP Fail alarms” on page 1-24.
Controller: Exciter
Changeover This event is caused by a fault in the active exciter while the automatic changeover function is enabled. No further exciter
changeovers can occur until the fault is cleared and the automatic
changeover function is re-armed (using the Changeovers page; refer
to the Operations and Maintenance Manual). Check for associated
alarm(s) that may have caused the changeover and refer to their
troubleshooting action.
Controller: Exciter
Compatibility Fault This alarm occurs when there is an incompatible software release in the exciter. Update the exciter software to clear the fault.
Controller: Fan PS A
(or B) AC Fail This alarm occurs if fan power supply module A (U7) or B (U8) is reporting an ac failure, indicating its ac input voltage is less than
175 V ac. Check the ac voltage applied to the suspect fan power
supply module. If the ac voltage is acceptable, replace the fan supply
module (see “Fan, IPA and Module Power Supply Replacement” on
page 1-43).
Controller: Fan PS A
(or B) Fail This alarm occurs if fan power supply module A (U7) or B (U8) is reporting a PS failure, indicating its output voltage is outside its
acceptable range. Check the dc voltage output of the suspect fan
power supply module. If the dc voltage is out of tolerance, replace the
fan supply module (see “Fan, IPA and Module Power Supply
Replacement” on page 1-43). If the voltage is acceptable, suspect the
control/interface PWB (A1) or interconnect cabling.
Alarm (with Prefix) Description and Troubleshooting Action

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Controller: Fan PS A
(or B) High Temp This alarm occurs if fan power supply module A (U7) or B (U8) is reporting a high temperature alarm, indicating its operating
temperature has exceeded its internal threshold. This alarm is most
likely caused by a module fan failure or blockage. Allow the module to
cool and attempt to Reset the alarm. Verify the module turns on and
its fan is operational. If the fan is not operational, inspect it for
possible blockage. If necessary, replace the fan supply module (see
“Fan, IPA and Module Power Supply Replacement” on page 1-43). If
the alarm persist after replacing the module, suspect the control/
interface PWB (A1) or interconnect cabling.
Controller: Fan PS A
(or B) Module Not
Present
This alarm occurs if fan power supply module A (U7) or B (U8) is not
being detected or has been removed.
Controller: Forward
Power Limiting When the High Forward Power alarm is active, this alarm occurs if the high forward power limiting threshold is exceeded [1.063 times the
maximum power setting for all modes; e.g., 5,846 W (NV5) or 4,384
W (NV3.5) for FM mode]. The transmitter will fold back the forward
power each time the threshold is exceeded. This alarm occurs only if
the exciter ALC cannot respond fast enough to transmitter load
changes. Suspect the control/interface PWB (A1).
Controller: Forward
Power Shutdown This alarm occurs if the transmitter tries to reduce the forward power below minimum due to repeated Forward Power Limiting alarms. The
transmitter latches off. See Controller: Forward Power Limiting for
troubleshooting tips.
Controller: High
Ambient Temperature This alarm occurs if the ambient temperature sensed by the control/ interface PWB (A1) exceeds 60°C (140°F). Check the intake air
system.
Controller: High
Forward Power This alarm occurs if the transmitter’s average forward power exceeds the high forward power threshold [1.036 times the maximum power
setting for all modes; e.g., 5,698 W (NV5) or 4,274 W (NV3.5) for FM
mode]. This alarm occurs only if the exciter ALC cannot respond fast
enough to transmitter load changes. Suspect the control/interface
PWB (A1).
Controller: High PA
Dissipation This alarm occurs when the calculated average power amplifier dissipation exceeds 200 W.
Alarm (with Prefix) Description and Troubleshooting Action

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Controller: High
Reflected Power This alarm occurs if the transmitter’s average reflected power exceeds the high SWR threshold [138 W (NV5 or NV3.5) for FM
mode, 98 W (NV5 or NV3.5) for FM+HD mode, 40 W (NV5 or NV3.5)
for HD mode]. Check for associated alarm(s) that may have caused
the alarm and refer to their troubleshooting action. Inspect the
antenna and transmission line system for damage or de-tuning, else
suspect the control/interface PWB.
Controller: High
Reject Power This alarm occurs if the power in any single reject load exceeds 67% of the reject shutback threshold (default is 1800 W in FM or FM+HD
mode; 900 W in HD mode). The alarm will also occur if the summed
power of both reject loads exceeds 89% of the reject shutback
threshold. Check for associated alarm(s) that may have caused the
alarm and refer to their troubleshooting action. This alarm may be
accompanied by a Reject Power Foldback alarm. Typically, high reject
power is a result of RF power module failure or removal. If no other
alarms are indicated, suspect the control/interface PWB.
Controller: High RF
Drive Power This alarm occurs if the active exciter’s power is greater than the high RF drive threshold [25 W for analog (FM) mode and 17 W for hybrid
(FM+HD) and all-digital (HD) mode). Compare the exciter’s
programmed level to its actual output. If a difference exists, there may
be an exciter regulation problem.
Controller: Interlock
Open The external interlock input wired to the control/interface PWB (A1) is open. Check the interlock connection between TB2-1 and TB2-2 on
the control/interface PWB (verify a ground potential at TB2-1). If the
interlock is intact, check all external interlock switches. Otherwise,
suspect a problem with the interlock circuitry on the control/interface
PWB.
Controller: IPA High
Current Cutback This alarm occurs if there is a failure in one or more IPA power supply module [A (U9), B (U10)] and the remaining IPA power supply module
is unable to provide the current required by the IPAs. This alarm is
typically accompanied by one or more Controller: Disable Module
alarms. Check the troubleshooting action in the associated alarm(s).
Alarm (with Prefix) Description and Troubleshooting Action

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Controller: IPA PS A
(or B) AC Fail This alarm occurs if IPA power supply module A (U9) or B (U10) is reporting an ac failure, indicating its ac input voltage is less than 175
V ac. If a bank of power supply modules are indicating an AC Fail
alarm, it is possible that an ac phase loss has occurred. Check the ac
voltage applied to the suspect IPA power supply module. If the ac
voltage is acceptable, replace the IPA supply module (see “Fan, IPA
and Module Power Supply Replacement” on page 1-43).
Controller: IPA PS A
(or B) Fail This alarm occurs if IPA power supply module A (U9) or B (U10) is reporting a PS failure, indicating its output voltage is outside its
acceptable range. Check the dc voltage output of the suspect IPA
power supply module. If the dc voltage is out of tolerance, replace the
IPA supply module (see “Fan, IPA and Module Power Supply
Replacement” on page 1-43). If the voltage is acceptable, suspect the
control/interface PWB (A1) or interconnect cabling.
Controller: IPA PS A
(or B) High Temp This alarm occurs if IPA power supply module A (U9) or B (U10) is reporting a high temperature alarm, indicating its operating
temperature has exceeded its internal threshold. This alarm is most
likely caused by a module fan failure or blockage. Allow the module to
cool and attempt to Reset the alarm. Verify the module turns on and
its fan is operational. If the fan is not operational, inspect it for
possible blockage. If necessary, replace the IPA supply module (see
“Fan, IPA and Module Power Supply Replacement” on page 1-43). If
the alarm persist after replacing the module, suspect the control/
interface PWB (A1) or interconnect cabling.
Controller: IPA PS A
(or B) Module Not
Present
This alarm occurs if IPA power supply module A (U9) or B (U10) is not
being detected or has been removed.
Controller: Low AC This alarm occurs if the ac input voltage is below the switching power
supplies’ internal threshold or one of the phases of a 3-phase source
has been lost. For 1-phase or 208 V ac 3-phase sources the low ac
threshold voltage is 175 V ac. For 400 V ac sources the low ac
threshold voltage is 303 V ac. Check the three amber LEDs (DS1
through DS3) in the bottom, left-hand of the transmitter. If the LEDs
are off, there is likely a problem with the ac service. Measure the ac
source voltage at the service entrance. Normally this should measure
between 180 and 264 V ac line-line [for 3-phase (nominal 208 V ac)
and 1-phase (nominal 230 V ac)] or between 312 and 457 V ac line-
line [for 3-phase (nominal 400 V ac)].
Alarm (with Prefix) Description and Troubleshooting Action