TDK-Lambda TPS4000 Series User manual

TPS4000 SERIES
POWER SUPPLY
OPERATION MANUAL
1
14 October 2019
GENERAL SAFETY INSTRUCTIONS .............................................................................................................................. 2
High Voltage Warning ....................................................................................................................................................... 2
Critical Components ......................................................................................................................................................... 2
Servicing ........................................................................................................................................................................... 2
Safety Class of Protection ................................................................................................................................................. 2
Installation ........................................................................................................................................................................ 2
Ratings, Specifications and Features .................................................................................................................................... 4
Emissions .......................................................................................................................................................................... 4
Immunity .......................................................................................................................................................................... 4
Maximum Ratings ............................................................................................................................................................ 5
Input Specifications .......................................................................................................................................................... 5
Output Performance Specifications .................................................................................................................................. 6
Protective Functions ......................................................................................................................................................... 6
Operating Modes .............................................................................................................................................................. 6
DC Output Controls and Indicators .................................................................................................................................. 7
Remote Control Features .................................................................................................................................................. 7
PMBus Features ................................................................................................................................................................ 7
Input, Output and Signal Connections .............................................................................................................................. 8
Signal Connector .............................................................................................................................................................. 9
Local Sense Setup ........................................................................................................................................................... 11
Remote Sense Setup ....................................................................................................................................................... 11
Parallel Operation Setup ................................................................................................................................................. 12
Series Operation Setup ................................................................................................................................................... 14
Ripple and Noise Notes ...................................................................................................................................................... 16
Mechanical Drawing ........................................................................................................................................................... 17
PMBus Interface ................................................................................................................................................................. 18

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POWER SUPPLY
OPERATION MANUAL
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GENERAL SAFETY INSTRUCTIONS
High Voltage Warning
Dangerous voltages are present within the power supply.
Critical Components
This product is not authorized for use as a critical component in nuclear control systems, life support systems or equipment
for use in hazardous environments without the express written approval of the Engineering Director of TDK-Lambda
Americas.
Servicing
This product is not customer serviceable.
Unit repairs shall only be carried out by TDK- Lambda Americas or their Authorized agents.
Contact: TDK-Lambda Americas
401 Mile of Cars Way, Suite 325
National City, CA 91950
Tel [phone]
Fax [phone]
Safety Class of Protection
The unit is designed for the following parameters: Material Group IIIb, Pollution Degree 2, Overvoltage Category II, Class
1 (earthed), Indoor use. The unit is considered as fixed and rated IPX0. The TPS400024 and TPS400048 are classed as
having SELV outputs. All outputs are capable of providing hazardous energy (>240VA). The final equipment should
provide protection to service personnel against inadvertent contact with the PSU output terminals.
Installation
This product is designed for use within other equipment which restricts access to Authorized competent personnel only.
The unit covers/chassis must not be made user accessible.
The appliance may be mounted in any orientation.
The mains input connector is not acceptable for use as field wiring terminals.
The appliance must be securely mounted and the baseplate properly bonded to the main protective earth contact before
any connection to AC mains supply is made.
The ventilation openings must not be impeded – ensure a space at least 5cm between any obstruction and the ventilation
openings.
BEFORE USING THE POWER SUPPLY UNIT
Be sure to read this instruction manual thoroughly before using this product. Pay attention to all cautions and warnings
before using this product. Incorrect usage could lead to an electrical shock, damage to the unit or a fire hazard.
DANGER
 Never use this product in locations where flammable gas or ignitable substances are present.
WARNING
 Do not make unauthorized changes to power supply unit, otherwise you might have electric shock and void your
warranty.
 Do not touch this unit and the internal components in operation or shortly after shut down. They might have high
voltage or high temperature and as the unit dissipates its heat so the surface of the unit is hot. You might receive electric
shock or burn.
 When the unit is operating, keep your hands and face away from it; you might be injured by an accident.
 Do not use unit under unusual conditions such as emission of smoke or abnormal smell and sound etc. It might cause
fire and electric shock. In such case, please contact us; do not repair by yourself, as it is dangerous for the user.
 Do not drop or insert anything into unit. It might cause failure and fire.
 Do not operate these units under condensation condition. It might cause fire and electric shock.

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OPERATION MANUAL
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CAUTION
 As a component part, compliance with the standard will be based upon installation in the final application. This product
must be installed in a restricted access location, accessible to authorized competent personnel only. These AC to DC
converters have reinforced insulation between the input and the output. The outputs of these products are energy hazards.
The equipment has been evaluated for use in a Pollution Degree 2 environment.
 This product is designed for use within other equipment or enclosures which restrict access to authorized competent
personnel only and must not be user accessible. Confirm connections to input/output terminals and signal terminals are
correct as indicated in the instruction manual.
 Input voltage, Output current, Output power, ambient temperature and ambient humidity should be used within
specifications, otherwise the unit will be damaged.
 For application equipment, which requires very high reliability (Nuclear related equipment, traffic control equipment,
medical equipment, etc.), please provide fail safety function in the equipment.
 Do not use the product in environment with strong electromagnetic field, corrosive gas and conductive substance.
 Do not operate and store this unit at an environment where condensation occurs. In such case, waterproof treatment is
necessary
 Never operate the unit under over current or shorted conditions for 30 seconds or more and out of Input Voltage Range
as specification. Insulation failure, smoking, burning or other damage might occur to the unit.
 The output voltage of this power supply unit is considered to be a hazardous energy level (The voltage is 2V or more
and the electric power is 240VA or more). Prevention from direct contact with output terminal is highly necessary. While
installing or servicing this power supply unit, avoid dropping tools by mistake or direct contact with output terminal. This
might cause an electrical shock. While repairing this power supply unit, the AC input power must be switched off and the
input and output voltage should be level.
 To maintain the SELV output, under fault conditions, the output must be connected to earth in the final application.
 The application circuits and their parameter are for reference only. Be sure to verify effectiveness of application
circuits and their parameters before finalizing circuit design.
 Do not inject abnormal voltage to output terminal and signal terminal from the outside. The injection of reverse voltage
or over voltage exceeding nominal output voltage to output terminals might cause damage to internal components.
 This information in this document is subject to change without prior notice. For actual design-in, please refer to the
latest publications of data sheet, etc., for the most up-to date specifications of the unit.
Note: CE MARKING
CE Marking when applied to a product covered by this handbook indicates compliance with the low voltage directive (2014/35/EU) in that it
complies with EN/IEC 60950-1.

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OPERATION MANUAL
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Ratings, Specifications and Features
Emissions
AC Line Conducted Emissions EN 55032:2015 (0.15-30 MHz) Class A
Radiated RF Emissions EN 55032:2015 0-1000 MHz Class A *
Immunity
Electrostatic Discharge IEC61000-4-2: 2008 +/-8 kV Air
+/-4 kV Contact
RF Radiated Fields EN 61000-4-3: 2006
+A1:2008 +A2:2010
3 V/m from 80-1000 MHz;
(80% AM at 1kHz)
Electrical Fast Transients EN61000-4-4: 2004+A1:2010 Power line pulses of ± 1 kV;
I/O line pulses of ± 0.5 kV
Lightning Surge IEC61000-4-5: 2005 ±4kV common mode
±2kV differential mode
Conducted RF Common Mode EN61000-4-6: 2009 150 kHz - 80 MHz at 3 Vrms
1 kHz 80% amplitude modulated
Power Frequency Magnetic Field IEC61000-4-8:2009 30A/m (Continuous), 300A/m (Short)
Voltage Dips/Short Variations IEC61000-4-11:2004 5% of nom. line for .5 cycles - Criteria B
70% for 25 cycles - Criteria B
95% Dip for 5 seconds - Criteria C
Voltage Dips/Short Variations SEMI F47-0706 50% of nom. line for 10 cycles - Criteria B
70% for 25 cycles - Criteria B
80% for 50 cycles - Criteria B
Table 1
*With appropriate installation

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Maximum Ratings
Units TPS400024 TPS400048
Output Voltage Range V 19.2-28.5 38.4-58
Maximum Output Current (Power) @ 50°C
1
,2
A(W)
170(4080) 85 (4080)
Maximum Output Current (Power) @ 50°C
2
A(W)
166(4000) 83.3(4000)
Maximum Output Current (Power) @ 60°C
2
A(W)
133.33(3200) 66.6(3200)
Maximum Output Current (Power) @ 70°C
2
A(W)
91.7(2200) 45.833(2400)
Maximum Output Power with Dropped Phase
3
A(W)
1600W 1600W
Minimum Current A Not needed
Operating Temperature
4
°C -10°C to 50°C.
Derating 50°C-60°C - 2%/C, 60°C-70°C 2.5%/C
Start-up Temperature
4
°C -40°C to +70°C
Table 2
1 Output adjustment at 24V set point for TPS400024 and at 48V set point for TPS400048.
2 Output current and power, as measured at output terminals, must be less than or equal to quoted maximum values for a given ambient
temperature.
3 Dropped phase condition operation is considered an abnormal operation condition. It is not recommended to operate the unit in this
mode permanently. Unit is able to handle the specified output power during dropped phase temporarily.
4 Operation at -40°C may require 10min warm up at 80% load to meet regulation and output ripple. Not all parameters are guaranteed
at -40°C operation.
Input Specifications
Units TPS400024 TPS400048
Input Voltage VAC 400/480 (50/60Hz) Three Phase Delta
Input Current (RMS) Per Phase
400-480VAC input
A 8.0 8.0
Inrush Current (Peak, at cold start)
Per Phase, 400-480VAC input *
A <25 <25
Power Factor (at rated output power) - 0.92 typical @ 400/480VAC line
Input EMI Conducted Emissions - FCC Class A, CISPR 22 Class A
Efficiency (at rated output power) % 92 typical @ 400/480VAC line
Table 3
*excluding initial spike charging EMI capacitors lasting <2mS

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Output Performance Specifications
Units TPS400024 TPS400048
Max Voltage Line Regulation % Less than 0.25%
Max Voltage Load Regulation % Less than 0.5%
Total Regulation
5
% Less than 1.75%
Warm up Drift % Less than 0.2%
Temperature Stability - 0.05% of rated Vout for 8hrs after 30min warm-
up. Constant line, load & temp.
Temperature Coefficient ppm/°C 200ppm/C
Ripple/Noise P-P(20MHz), JEITA RC-9131C
5
mVp-p 240 480
Output Ripple, JEITA RC-9131C
6
mVrms <0.5% of Vout
Remote Sense Compensation (Total) V 1.0V 1.0V
Table 4
5 Total Regulation at -40°C may require 10min warm up at 80% load to meet regulation and output ripple.
6See Ripple and Noise Notes for Details on Jeita RC-9131C method; All Three Phases present
Protective Functions
Units TPS400024 TPS400048
OCP TYPE - CONSTANT CURRENT / CONSTANT RESISTANCE
OCP KNEE POINT - Adjustable (70% - 105% of max rated current)
KNEE POINT PROTECTION - NONE. NO DAMAGE AT KNEE POINT
S/C PROTECTION - CONSTANT CURRENT w/ time-delayed shutdown.
SHORTED OUTPUT ON - NO DAMAGE
OVP TYPE - Tracking, Inverter shut-down (automatic reset)
OVP RANGE - Vout*1.15
OVP RESET TIME s Auto Resets 3 times at ~3s interval, then latches off for 1min. Reset
cycle is repeated until OVP condition clears.
FAN FAIL - Blocked fan and fan failure detection. Manual reset by input cycling
or remote control via the PMBus Interface.
OTP - Yes. Standard: Non-Latch type (automatic reset)
Table 5
Operating Modes
Series Operation Yes
Parallel Operation Current share single wire (Terminal 1 on Signal Connector), 10%
accuracy of max Iout up to 8 units. Power derated 10% of rated. No Oring
diodes are required for redundant operation as the power supplies contain
internal Oring MOSFETS.
Table 6

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POWER SUPPLY
OPERATION MANUAL
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DC Output Controls and Indicators
Output Voltage Adjust Screwdriver adjustment over entire range. Output voltage range is specified in
Table 2. (Multi-turn potentiometer accessible from terminal end of chassis.)
Overcurrent Protection Adjust Screwdriver adjustable (70% - 105% of max rated current)
DC OK LED: Green when output >90% of set voltage, Red when fault.
LED will turn off when unit enters OTW range.
AC ON LED: Green when AC is present
Blinking RED/GRN when phase dropped (Applicable for 400/480 with 30%
Load or greater).
Table 7
Remote Control Features
Remote Voltage Sensing Provides precise regulation directly at load. Maximum total DC voltage drop
between output terminals and load must be limited to <1.0 V. In addition, the
voltage at the output terminals must be limited to the maximum voltage range
specified in Table 2.
Remote On/Off Control On/Off control: Selectable Enable or Inhibit via front panel switch.
Switch in the ON position: Unit powers up if PSON left open; Unit in standby
mode if PSON shorted to -SNS
Switch in the OFF position: Unit in standby mode if PSON left open; Unit
powers up if PSON shorted to -SNS
PSON High / Low thresholds: 3.0V / 0.6V
12V Maximum allowable.
-5V Minimum allowable
Signal applied between terminals 14 (PSON) and 18 (-SNS) on Signal
Connector.
Remote Voltage Programming Provides remote adjustment of the output voltage via a DC voltage applied
between terminals 3 (VADJ) and 18 (-SNS) on Signal Connector.
0V = Vout max, 5V = Vout min
Adjustments of greater than 1V/Sec can cause Fault conditions
Adjustment range changes with adjustment of Vout Adj trim pot.
Remote Overcurrent Limit
Programming
Provides remote adjustment of the Overcurrent limit via a DC voltage applied
between terminals 10 (IADJ) and 18 (-SNS) on Signal Connector.
0V = Iout max, 5V = Iout min
Adjustment range changes with adjustment of ILIMIT Adj trim pot.
Table 8
PMBus Features
Output Voltage Monitoring Output voltage monitoring via the PMBus.
Accuracy of the voltage reading is +/-2% of full scale
Output Current Monitoring Output current monitoring via the PMBus.
Accuracy of the current reading is +/-10% of full scale
Remote On/Off Control Supply ON/OFF control via the PMBus
Remote Voltage Programming Provides remote adjustment of the output voltage via the PMBus interface.
Adjustments of greater than 1V/Sec can cause Fault conditions
Remote Overcurrent Limit
Programming
Provides remote adjustment of the Overcurrent limit via the PMBus interface.

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Table 9
Input, Output and Signal Connections
Input Heavy Duty terminal block with M4 screws. Grounding terminal included on
terminal block.
DC Output Heavy-duty bus bars with 9mm clearance hole for load connections.
Signal Connector 20 pin signal connector. See Table 11 for pin configuration
Recommended mating connector: JST P/N: PHDR-20VS
Recommended receptacle contacts: JST P/N: SPHD-001T-P0.5
Address Pin / PMBus Voltage
Selector Pin
10 pin connector.
Rows 1-4 used for PMBus address selection.
Row 5 used to select PMBus Voltage Selection. Open = 5V; Short = 3.3V
Recommended shunt jumper: Samtec P/N: 2SN-BK-G
I2C Connector 4 Pin connector: See Table 12 for pin configuration
Recommended mating connector: MOLEX P/N: 51110-0460
Recommended receptacle contacts: MOLEX P/N: 50394-8051
Table 10

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Signal Connector
Name Terminal
Location
Description
ISHARE 1 Current share single wire.
IOUT 2 Current monitor signal.
0V = Iout min, 5V = Iout max.
Terminal 18 used for Return.
VADJ 3 Remote Voltage Programming Terminal.
Terminal 18 used for Return.
ISHARE 4 Current share single wire.
OTW 5 Over Temperature Warning
Open collector. Non Polarized, 60V peak,
Max. sink current: 5mADC. 2Ω ON resistance, Isolated
Terminal 7 used for Return.
+SNS 6 Positive Sense. Used for remote sense connection.
RTN (OTW) 7 Return for Terminal 5
-SNS 8 Negative Sense. Used for remote sense connection. Analog Signals return
PHASE OK 9 Open collector. Max. sink current: 5mA.
Off (open) when OK, ON (closed) when input phase missing
(Applicable for 400/480 with 30% Load or greater).
Open collector. Non Polarized, 60V peak,
Max. sink current: 5mADC. 2Ω ON resistance, Isolated
IADJ 10 Provides remote adjustment of the overcurrent limit via an applied DC voltage.
0V = Iout max, 5V = Iout min
Terminal 18 used for Return.
RTN (PHASE
OK)
11 Return for Terminal 9
PSON 12 Remote On/Off control. See Remote Control Features section for additional
details. Terminal 18 used for Return.
RTN (AC OK) 13 Return for Terminal 15
PSON 14 Remote On/Off control. See Remote Control Features section for additional
details.
Terminal 18 used for Return.
AC OK 15 On when Vin>340Vac AND unit enabled. Turns off 5mS before DC FAIL at
nominal Vout, 80% of rated load.
Open collector. Non Polarized, 60V peak,
Max. sink current: 5mADC. 2Ω ON resistance, Isolated
Isolated
+SNS 16 Positive Sense. Used for remote sense connection.
DC OK 17 Conducts when Vout is greater than 90% of the set output voltage (Tracking)
Open collector. Non Polarized, 60V peak,
Max. sink current: 5mADC. 2Ω ON resistance, Isolated
-SNS 18 Negative Sense. Used for remote sense connection. Analog Signals return
RTN (DC OK) 19 Return for Terminal 17
+12V 20 Auxiliary Power Supply: 11.2-12.5V, 0-0.3A. Less than 200mVp-p ripple and
noise.
Table 11

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PMBus Connections
Name Terminal
Location
Description
SMB ALERT 4 Interrupt Line for I2C
SMB GND 3 Return for I2C
SCL 2 Clock Line for I2C
SDA 1 Data Line for I2C
Table 12
Figure 1: Pin assignments

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Local Sense Setup
Figure 2: Typical Local Sense Connection
Remote Sense Setup
Figure 3: Typical Remote Sense Connection
* Suitable Decoupling Capacitor (0.1uF or higher) may be required at load.

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Parallel Operation Setup
Figure 4: Parallel Operation (Local Sensing)
*Suitable Decoupling Capacitor (0.1uF or higher) may be required at load.
For optimal performance, power supplies should have their output voltages set to within 1% of each other

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Figure 5: Parallel Operation (Remote Sensing)
*Suitable Decoupling Capacitor (0.1uF or higher) may be required at load.
For optimal performance, power supplies should have their output voltages set to within 1% of each other

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Series Operation Setup
Figure 6: Series Operation (Local Sensing)
*Suitable Decoupling Capacitor (0.1uF or higher) may be required at load.
Note: It is recommended that diodes rated a minimum of 50V be used for any TPS4000-24 units operated in series and
diodes rated at a minimum of 100V be used for any TPS4000-48 units operated in series.

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Figure 7: Series Operation (Remote Sensing)
*Suitable Decoupling Capacitor (0.1uF or higher) may be required at load.
Note: It is recommended that diodes rated a minimum of 50V be used for any TPS4000-24 units operated in series and
diodes rated at a minimum of 100V be used for any TPS4000-48 units operated in series.
DO NOT CONNECT THE SENSE WIRES IN PARALLEL DURING SERIES OPERATION – THIS MAY RESULT IN
DAMAGE TO THE POWER SUPPLY.

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Ripple and Noise Notes
Ripple and Noise is measured according to the description below in accordance with JEITA RC-9131C (Sections 7.16,
7.17 and 7.18).
The measurement connection is shown in Fig. 3-1.
C1 (0.1µF Ceramic Capacitor), C2 (47uF Aluminum Electrolytic Capacitor) must be connected in parallel at 30cm from
the output terminals, along the load cable. Attach a maximum 1.5m 50Ω coaxial cable from the ceramic capacitor electrodes
to a filter attachment installed on the oscilloscope. The filter attachment consists of C3 (4700pF film capacitor) in series
with R (50Ω resistor). Use 100MHz bandwidth oscilloscope or equivalent.
In general, output ripple voltage and output spike noise voltage can be reduced by increasing external capacitance.
Figure 8: Output Ripple Voltage (including Spike Noise) Measurement Method

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Mechanical Drawing
Overall dimensions for the TPS4000 series are shown below:

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PMBus Interface
The TPS4000 has Power Management Bus (PMBus) hardware.
The PMBUS interface in the TPS4000 includes:
•
Monitoring the Output Voltage (+/- 2% of Full Scale).
•
Monitoring the Output Current (+/- 10% of Full Scale).
•
Monitoring the internal Temperature (works on +40°C to 106° C range. Above 106°C the OTP activates and the
monitor reads >180°C).
• Programming the Output Voltage (+/- 2% of Full Scale).
•
Programming the Current Limit (+/- 2% of Full Scale) .
•
Programming the Supply ON/OFF state.
•
Reading and Clearing Faults.
•
Reading the Manufacturing Related Data (Model Name, Serial No, Manufacturing Date, etc).
ATTENTION:
The PMBus supports:
 100 KHz Operation.
 Block Read Protocol.
 Group Command Protocol.
 Direct Command Format for Monitoring and Programming
 Functions. Ver. 1.1 of PMBus Specifications.

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ADDRESSING (A3, A2, A1, A0 inputs)
To communicate with the TPS4000, the master must first address the slave devices via a slave address byte. The
slave address byte consists of seven address bits and a direction bit that indicates the intent to execute a read or write
operation.
The TPS4000 features four variable address lines that allow up to 16 Supplies to be connected on a single bus.
P
MBus uses 7 bit addressing.
There is constant part of address and variable part of address:
Constant part of address consists of 3 Most Significant Bits A6, A5, and A4 and always equals 010.
Variable part of address consists of 4 Least Significant bits: A3, A2, A1, and A0.
Values of these four bits have to be assigned by hardware connections of 4 pins of the TPS4000 address connector.
The Address lines (A3, A2, A1, and A0) are internally pulled up by resistors to +5V.
The Address lines can be left open for ‹1› address or connected for ‹0› address.
There are 16 possible addresses: from 0100000 to 0101111.
In case more than one TPS4000 is connected to PMBus, each unit must be set to its own unique address. Duplicate
addressing is not allowed.
A6 A5 A4 A3 A2 A1 A0
R/W
Byte Hex Address
0 1 0 0 0 0 0 x 40h
0 1 0 0 0 0 1 x 42h
0 1 0 0 0 1 0 x 44h
0 1 0 0 0 1 1 x 46h
0 1 0 0 1 0 0 x 48h
0 1 0 0 1 0 1 x 4Ah
0 1 0 0 1 1 0 x 4Ch
0 1 0 0 1 1 1 x 4Eh
0 1 0 1 0 0 0 x 50h
0 1 0 1 0 0 1 x 52h
0 1 0 1 0 1 0 x 54h
0 1 0 1 0 1 1 x 56h
0 1 0 1 1 0 0 x 58h
0 1 0 1 1 0 1 x 5Ah
0 1 0 1 1 1 0 x 5Ch
0 1 0 1 1 1 1 x 5Eh
Factory default Address is 5Eh.
SERIAL CLOCK
This line is clocked by the Controller which controls the PMBUS. It is connected to +5.0V (referenced to “SMB_GND”)
via a 5.0kΩ pull-up resistor.
SERIAL DATA
This is a Bi-Directional line which is connected to +5.0V (referenced to "SMB_GND") via a 5.0kΩ pull up resistor.
ALERT
ALERT is used to indicate to the HOST about any Faults/Error/Warning Conditions.
This line is connected to +5.0V (referenced to "SMB_GND") via a 2.49kΩ pull up resistor.
This Signal is HIGH to indicate that no fault/error/warning is present. If some fault/error/warning occurs, the signal will
go LOW.
The Host system must poll multiple supplies after receiving ALERT to retrieve fault/error/warning information.
Note: The TPS4000 does not respond to Alert Response Address.

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PMBusTM COMMAND SET
OPERATION (ON/OFF)
If the Power Supply is turned OFF with the “OPERATION OFF” command, the Supply can be turned ON with the
“OPERATION ON” command.
Command code Type Data sent
01h
R/W Byte 00h=OFF
01h
R/W Byte 80h=ON
After applying AC power to the unit the default control mode is the “Local Mode”.
In this Mode the Front Panel Output Enable Switch will control the output state.
To turn ON or OFF the Unit in “Remote Mode” (I2C) you need to do the follow:
Set Operation Mode to “Remote Mode”.
Then issue “Operation ON” to turn ON or “Operation OFF” to turn OFF the unit.
Once you enter “Remote Mode” the Front Panel Output Enable Switch has no longer control of the Output until you change
over to “Local Mode”.
Attention: If the unit is ON and you issue “Operation OFF” followed by “Operation ON” command within 3.0 Sec, the
Unit will remain in the OFF state for 3.0 Sec from the time you issue the “Operation OFF” command.
Also in Local Mode the Front Panel Output Enable Switch will behave in the same way. If the unit was enabled and you
disable it follow by Enable within 3.0 Sec, the Unit will remain in the OFF state for 3.0 Sec from the time you disabled the
unit.
When you switch from “Local Mode” to “Remote Mode” for first time after applying AC power the default Operation State
will be “Operation ON”.
However, if you try to change Operation State before you change Operation Mode to “Remote Mode” the unit will respond
with error and will ignore the command.
If you need the Unit OFF when you enter “Remote Mode” you need to issue “Operation OFF” command right after entering
“Remote Mode”.
OPERATION MODE
This command is used to set the way you Enable/Disable the output of the Unit. Setting the Operation Mode to
“Remote Mode”
allow you to control the output using the “OPERATION ON/OFF” command via the I2C. In the
“Local Mode”
you have the
option to use the
Front Panel Output
Enable Switch or the “PSON” pin on the Signals connector.
Command code Type Data sent
D8h
R/W Byte 00h=Remote
D8h
R/W Byte 80h=Local