BEHLMAN PF1352 Series User manual

PF1352 USER MANUAL REV A 12/21/15
USER'S GUIDE AND
TECHNICAL REFERENCE
BEHLMAN MODEL
PF1352 SERIES AC POWER SUPPLY
PART NO. 108-017-006
FOR SERVICE ASSISTANCE
CONTACT BEHLMAN
CUSTOMER SERVICE DEPARTMENT
PHONE TOLL FREE 1-800-874-6727
OR WRITE
BEHLMAN
CUSTOMER ELECTRONICS DEPARTMENT
80 CABOT COURT
HAUPPAUGE, NY 11788
PHONE: [phone]
FAX : [phone]
FOR SALES INFORMATION:
PHONE: [phone]
USA : [phone]
FAX : [phone]

PF1352 USER MANUAL REV A 12/21/15
LIMITED WARRANTY
Behlman Electronics, Inc. warrants, to the original purchaser, for a period of one (1) year from the
date of shipment from Behlman, each item to be free from defects in material and workmanship.
Bellman’s obligation and the Purchaser's sole remedy for any breach or violation of this agreement is
limited to adjustments, repair or replacement for parts which have been promptly reported by the
Purchaser as having been, in its opinion, defective and so found by Behlman upon inspection. All
replacement parts will become the property of Behlman on an exchange basis. This warranty will not
apply if such adjustments, repair or parts replacement is required because of accident, neglect,
misuse, failure of environmental controls, transportation damage or causes other than normal use.
If during the warranty period a defect should impair the performance of the unit, Behlman agrees, at
its option, to repair or replace the unit or its defective components F.O.B. Behlman at 80 Cabot
Court, Hauppauge New York 11788 or at another Behlman service facility at Bellman’s option. To
obtain service under this warranty, the original Purchaser shall notify Behlman at the above address
or by Telephone at 631-435-0410 and provide information about the defect or impairment of
performance. Behlman will then supply the Purchaser a Return Material Authorization (RMA)
number. This number must be attached to the equipment sent back for warranty repair. Equipment
must be shipped back to Behlman prepaid. No collect shipments will be accepted.
Behlman shall be excused from supplying warranty service if the equipment covers have been
removed or if the unit has been subject to unauthorized repair. All service outside the scope of this
Warranty shall be paid for by the Purchaser at Bellman’s rates in effect at the time of repair. Behlman
will not perform any repairs outside of the Warranty without written authorization by the Purchaser.
If the repair is a warranty repair, Behlman will ship the unit back to the Purchaser, by a method
determined solely by Behlman, prepaid. If the Purchaser requests any other means of transportation
it shall be at the Purchaser's expense.
The use of the equipment shall be under the Purchaser's exclusive management and control. The
Purchaser will be responsible for assuring the proper installation, use, management and supervision
of the equipment. Behlman will not be liable for personal injury or property damage.
The foregoing warranties are in lieu of all other warranties, expressed or implied including without
limitation warranties of merchantability and fitness for purpose.
In no event shall Behlman be liable for loss of profits, loss of use, or any other indirect, consequential
or incidental damages. Purchaser agrees that Behlman will not be liable for any damages caused
by the Purchaser's failure to fulfill any of the Purchaser's responsibilities set forth herein.

PF1352 USER MANUAL REV A 12/21/15
CLAIM FOR DAMAGE IN SHIPMENT
Under the FOB factory terms of sale, ownership and responsibility are transferred to the customer when the
equipment leaves the factory. Each Behlman instrument is shipped from the factory in proper operating condition.
Immediately upon receiving equipment, unpack and inspect it for evidence of damage incurred in shipment. IF
equipment is damaged, file a claim with the freight carrier. Forward a copy of the damage claim report to
Behlman. Include the model number, serial number and date the shipment was received. Behlman will advise
the disposition of the equipment and will arrange for necessary repair or replacement.
RETURNING EQUIPMENT TO FACTORY
Do not return equipment to the factory without prior authorization from Behlman.
This equipment, like all precision electronic equipment, is susceptible to shipping damage. It contains heavy
magnetic components as well as delicate electronics components. If equipment is returned without prior
authorization, the shipment will be refused and the customer will be liable for all shipping, handling and repair
costs. When packing for reshipment, use the original shock absorbent material and shipping container to prevent
additional damage to the equipment.
Ensure that the return authorization numbers (RMA) is available on the container.
PACKING INSTRUCTIONS
RACK MOUNTED UNITS
I) Box(es) must be double wall with minimum 350 lbs bursting test.
2) Box(es) must provide for a minimum of 2 to 3 inches of clearance around sides, top and bottom of
unit.
3) When packing unit, utilize either a foam-in-place system or high density foam. Clearance provided
for above must be completely filled with foam.
FAILURE TO COMPLETELY SECURE UNIT IN BOX WILL ALLOW MOVEMENT
DURING SHIPPING, RESULTING IN DAMAGE.
DO NOT USE PEANUTS OR BUBBLE WRAP
4) Secure box(es) to pallet(s). This is necessary to insure proper handling and protection during
shipping.
5) Place the following warning label on box(es)
DO NOT STACK
6) Ship unit using a freight cargo carrier; air or ground.

PF1352 USER MANUAL REV A 12/21/15
SAFETY SUMMARY
The following safety precautions must be observed during all phases of operation,
service, and maintenance of this equipment. Failure to comply with these precautions
or with specific warnings elsewhere in the manual violates safety standards associated
with the design and intended use of this equipment. This manual forms an integral part
of the equipment and must be available to operating personnel.
GROUND THE EQUIPMENT
This equipment may have high leakage current to chassis due to EMI filtering requirements.
To minimize shock hazard, the equipment chassis(s) must be connected to an electrical safety
ground. This equipment is supplied with a three conductor line connection for single phase
applications and/or a five wire connection for three phase applications. Both types include an
earth terminal intended for safety ground connections. In addition, isolated installation sites
may require neutral to earth connections as per NEC section 250 (National Electrical Code).
Refer installation to licensed electrician or other qualified personnel.
DO NOT OPERATE IN EXPLOSIVE ATMOSPHERE
Do not operate the equipment in the presence of flammable gases or fumes. Operation of any
electrical instrument in such an environment constitutes a definite safety hazard.
KEEP AWAY FROM LIVE CIRCUITS
Operating personnel must not remove equipment covers. Component replacement and internal
adjustments must be made by qualified maintenance personnel. Do not replace components
with power applied. Under certain conditions, dangerous voltage may exist even with the
power removed. To avoid injuries, always disconnect power and discharge circuits before
touching them. During normal operation the operator does not have access to internal
hazardous voltages. However, depending on the user’s application configuration, HIGH
VOLTAGES HAZARDOUS TO HUMAN SAFETY may be normally generated at the output
terminals. The customer/user must insure that the output power lines are labeled properly as
to the safety hazard and that any inadvertent contact is eliminated.
DO NOT SERVICE OR ADJUST ALONE
Do not attempt internal service or adjustment unless another person, capable of rendering first
aid and resuscitation is present.
DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.
Because of the danger of introducing additional hazards, do not install substitute parts or
perform any unauthorized modification to this equipment. Contact Behlman Electronics for
proper replacement parts and specific service information.

PF1352 USER MANUAL REV A 12/21/15
DANGEROUS PROCEDURE WARNINGS !
Warnings will precede potentially dangerous procedures in this manual. Instructions contained
in the warning must be followed. Warnings will be preceded by the caution symbol (above).
RISK OF ELECTRIC SHOCK
This symbol warns personnel of hazardous conditions due to the exposure of hazardous
voltage that can be lethal if contacted.
Neither Behlman Electronics, Hauppauge, NY, USA, nor any of the subsidiary sales
organizations can accept any responsibility for personnel, material or inconsequential injury,
loss or damage that may result from improper use of the equipment and/or accessories
provided.
For additional safety related technical information, contact the Behlman Electronics sales
department or local sales representative.
[email protected]
or call 631-435-0410

PF1352 USER MANUAL REV A 12/21/15
TECHNICAL MANUAL PF1352 AC POWER SUPPLY
TABLE OF CONTENTS
Section Title
1 Introduction
1.1 Specifications
1.2 Unpacking & Inspection
2 Installation and Wiring
2.1 Power Requirements
2.2 Wiring
2.3 AC Output Load Connections
3 Operation
3.1 Features and Indicators
3.2 Operational Considerations
3.3 Power Display Mode
3.4 Operating Considerations
3.5 Current Limit and Constant Current Mode
3.6 Operation Under Fault Conditions
3.7 Limiting Load In-rush Currents
3.8 Operation Into Linear Loads
3.9 Driving Reactive Loads
3.10 Driving Lamps
3.11 Driving Motors
3.12 Operation With Remote Control
4 Maintenance and Trouble Shooting
4.1 Maintenance
4.2 Troubleshooting
4.3 Performance Verification
5 Mechanical Outline
6 Remote Interface
6.1 Introduction
6.2 Installation
6.3 Behlman Remote Interface
6.4 Webpage

PF1352 USER MANUAL REV A 12/21/15
SECTION ONE
INTRODUCTION
1.0 The Behlman PF series of AC power supplies are designed to provide regulated AC
power at frequencies and /or voltages not available from local utilities. All models are
completely solid state, PWM switching types that provide high efficiency and overall
reliability. These devices require very little maintenance and will provide years of trouble
free service when used within their ratings. The models in this series include an active
power factor correction circuit to reduce input harmonics associated with the conversion
process used. These models are housed in an all steel, EIA rack mountable enclosure.
The block diagram below illustrates the conversion process performed by this
equipment. AC power is applied and converted to DC by an active power factor
corrected boost converter. This DC is then used to provide raw power for a class D
amplifier. The amplifier is driven from a reference signal at the desired output frequency.
The resulting amplified signal is applied to a step-up transformer to provide both
isolation and the desired output voltage. Short circuit protection and current limit are
performed by the control electronics.

PF1352 USER MANUAL REV A 12/21/15
SECTION ONE
1.2 SPECIFICATIONS FOR AC POWER SUPPLY PF 1352 SERIES
INPUT POWER REQUIREMENTS: 95* to 270 VAC, 47 - 63 Hz @ 16A Max.
(Full power from 108V – 267V)
(*) input current limited to 16A.
AC OUTPUT POWER: 1200W (with 120 – 270 VAC Input)
OUTPUT FREQUENCY: Variable from 45 – 500Hz (45 -1000 E opt.)
AC OUTPUT T.H.D. 1.5% TYPICAL @ 120V / 50Hz, resistive load.
AC OUTPUT CURRENT: 10A @ 135V RANGE, 5A @ 270V RANGE.
AC OUTPUT REGULATION: 0.7 % No load to Full load, (resistive).
LINE REGULATION: 0.7% for 10% line change.
METERING:
VOLTAGE: +/- (0.5% of reading +/- 2 LSD), 0.1V res.
CURRENT: +/- (1% of reading + /- 5 LSD), 0.1A res.
FREQUENCY: +/- 1Hz 0.1Hz res.
POWER: +/- 2.5%, of F.S. (150–1200W) 1W res.
POWER FACTOR: +/- 2.5% of F.S. (150-1200W) 0 - .99
PHYSICAL: 19”(482mm) W x 17”(431mm) D x 3.5”(88mm) H
EIA standard rack mount cabinets (with RM kit).
WEIGHT: 39 lbs. (17.6 kgs)
OPERATING TEMPERATURE: 0 to +40 degrees Celsius.
STORAGE TEMPERATURE: -10 to +60 Degrees Celsius.
SAFETY: Evaluated to IEC-61010, general safety, protection
Class1, pollution level 2.
OPTIONAL Remote interface safety and
Isolation conform to IEC- 60950-1.

PF1352 USER MANUAL REV A 12/21/15
SECTION ONE
1. UNPACKING AND INSPECTION
Remove the equipment from its packaging and inspect it for shipping damage. If the
shipping container shows signs of damage, retain it for inspection and file a claim with
the shipping carrier. If the equipment shows signs of damage, DO NOT attempt to
operate it. Contact Behlman immediately and file a damage claim with the shipper. Prior
authorization is required before sending any equipment back to Behlman. This is in the
form of a Returned Material Authorization number that must be obtained from Behlman.
Any shipment sent without an RMA # will be refused and the customer will be liable for
all shipping costs.
This equipment ships with a line cord and a copy of the user/technical manual provided.
It is recommended that the serial number be verified and retained in case of any
warranty claims. The warranty for this unit is one year for parts and labor. See the
Warranty statement at the beginning of this document for specific information. All
warranty repairs must be performed by Behlman or one of its authorized
representatives. Contact [email protected] for information regarding warranty repair
or manufacturers representatives..

PF1352 USER MANUAL REV A 12/21/15
SECTION TWO
INSTALLATION AND WIRING
2.1 INSTALLATION
This device is designed primarily for desktop or bench top operation. This model may
also be mounted in an EIA standard equipment rack using the RM adaptor kit available
from Behlman. If the unit is to be rack mounted, it must be placed so as not to block the
cooling vents on the sides, top, and rear panels. Rear support must also be provided.
This may be in the form of internal support “rails” or chassis slides. Many equipment
rack manufacturers can supply generic support brackets or shelves to be used with their
racks. Racks that are completely sealed will require ventilation to remove heat
generated by the AC power supply’s exhaust.
The installation site must protect the power supply from moisture and any conductive
particulate matter. IN NO CASE should this unit be operated in the presence of dripping
or misting fluids. For continuous full power output, the ambient operating temperature
should not exceed 40 degrees Celsius.
WARNING !
INSTALLATION AND OPERATION
MAY EXPOSE PERSONNEL TO HAZARDOUS
VOLTAGE AND CURRENT LEVELS
2.2 INPUT POWER CONNECTION
This unit operates from any AC voltage from 95 -270V with a frequency between 47 and
63 Hertz. A detachable line cord is provided that mates with the IEC-19 type receptacle
(J1) on the rear panel. The other end of the supplied line cord is left un-terminated so
that the end user can affix the proper plug to mate with power receptacles available at
the installation site. Conformance to IEC safety standards limits the input to 250VAC.
WARNING
THIS DEVICE IS SUPPLIED WITH A 3 WIRE LINE CONNECTION THAT INCLUDES A PROTECTIVE
EARTH CONDUCTOR (YEL/GREEN WIRE). THIS CONNECTION IS CRITICAL TO OPERATOR
SAFETY AND MUST BE TIED TO THE INSTALLATION SITE PROTECTIVE EARTH. DUE TO
COMPONENTS USED FOR EMI REDUCTION, THIS DEVICE MAY PRODUCE LEAKAGE CURRENTS
THAT ARE HAZARDOUS. THE EARTH CONNECTION PROVIDES A RETURN PATH FOR THESE
CURRENTS.

PF1352 USER MANUAL REV A 12/21/15
2.3 AC OUTPUT LOAD CONNECTIONS
Connect the load to the rear panel AC output at TB1. TB1 is marked “H” and, “L”, and
“G” (chassis). Note that this device produces output voltages that are hazardous under
normal conditions. The end user must make sure that all output wiring is installed in a
way that prevents inadvertent contact with operating personnel. The use of warning
labels is highly recommended.
The output circuit of this device is transformer coupled and floating with respect to the
input line. Either side of the AC output may be tied to earth or other potential. The
maximum continuous floating voltage that can be applied between either output terminal
and ground is 500VDC. Dielectric strength is 1500Vrms for 60 seconds. Refer to figure
2-1 for an illustration of a typical PF series power supply output circuit configuration.
FIGURE 2-1 PF1352 OUTPUT CIRCUIT

PF1352 USER MANUAL REV A 12/21/15
SECTION THREE
OPERATION
3.1 CONTROLS AND INDICATORS
Table 3-1 below lists the controls, indicators, and other features associated with the
model PF1352 AC power supply. Refer to figure 3-1 for locations.
TABLE 3-1
ITEM DESIGNATION COMMENT/DESCRIPTION
1 AC line POWER switch Power on/off switch.
2 Alpha Numeric Display Displays output parameters and settings
3 OUTPUT Switch Push button switch controls application of AC
voltage to output terminals. Push to turn on.
4 RANGE Switch Push button switch controls range of AC
output voltage. Selects between 0-135V (low)
or 0 -270V (high). Push in for HIGH range.
5 LOCAL REMOTE switch On older models, this switch selected between
local and remote operation. A version units do
not use this switch .
6 SHIFT “key” Used in conjunction with control “keys” to set
output parameters. Set s the adjustment
resolution to x0.1, x1,x10, or x100
7 Control “Keys” Used in conjunction with SHIFT key to set
display and output parameters. MODE selects
the parameter to be adjusted. UP/DOWN
provides adjustment with the currently
selected resolution.
8 LED indicators Indicate status of : Output, Range, and com.
function ( BUSY)
9 Output Terminal Block Enclosed type 3 position wire terminals.
10 AC input receptacle IEC- 19 type AC receptacle.
11 Input Line fuse (F1) 6.3 x 32mm, 16A, 300Vac fuse. CAUTION,
replace with same type and rating only.
12 REMOTE INTERFACE Provides remote control via RS-232, USB, or
Ethernet type hardware interface and boot
switch.
13 RESET Recessed push button , reset controller and
interface to power on condition.

PF1352 USER MANUAL REV A 12/21/15
FIGURE 3-1 PF1352 CONTROLS AND INDICATORS
21
3
45
10
6 7
12
9 8
11
H L G

PF1352 USER MANUAL REV A 12/21/15
3.2 OPERATING INSTRUCTIONS
1. Connect the unit to a source of AC power between 95 & 267 VRMS and 47-63Hz.
NOTE: for full power operation, input must be at least 108V. Conformance with
IEC safety standards limits the input to 250VAC. See section 2 of this manual for
specific wiring information.
2. Connect the load to the rear panel output terminal block. The load is connected
between H and L. A third terminal tied to the chassis is provided to allow attachment
of a safety earth connection.
3. With loads connected and switched off (recommended), turn on the front panel
power switch and allow a few seconds for the power supply to stabilize. The sound
of the cooling fans should be evident and the front panel display should appear as in
figure 3-2 below.
4. Note that the default multiplier is “Vx1.0”. This indicates the output voltage may now
be set in 1 volt increments using the UP or DOWN keys. To change the step size,
hold in the SHIFT key. At the same time press the MODE key. Each time the MODE
key is pressed the multiplier step size will increase by a factor of ten. The available
step resolutions are: x0.1, x1.0, x10, x100. Note that the unit will automatically limit
the maximum output voltage depending on the setting of the RANGE switch.
5. To set the output frequency, press the MODE key once. The display should now
appear as in figure 3-3 below.
OUTPUT
CURRENT
V 0.0 I 0.0 F400.0
IL 10.0 Vx1.0
OUTPUT
VOLTAGE
DEFAULT
CURRENT
LIMIT
DEFAULT
FREQUENCY
DEFAULT
MULTIPLIER
V 0.0 I 0.0 F400.0 FREQUENCY
Fx1.0
IL 10.0
OUTPUT
VOLTAGE
CURRENT
LIMIT FREQUENCY
MULTIPLIER
OUTPUT
CURRENT

PF1352 USER MANUAL REV A 12/21/15
6. The “F” in front of the multiplier indicates that frequency is the parameter now
controlled by the UP/DOWN keys. Use the UP/DOWN keys to set the frequency to
the desired value. Remember that the “step size” or resolution can be changed by
holding the SHIFT key and pressing the MODE key to select the desired multiplier
value.
7. Use the SHIFT and MODE keys along with the UP/DOWN keys to set the output
voltage to the desired value. Make sure the unit is set to the required output voltage
range using the front panel RANGE switch. Remember holding the SHIFT key and
pressing the MODE key sets the resolution multiplier.
8. After the voltage and frequency (and current limit if required) are set, the load may
be energized by pressing the OUTPUT switch button. (Note that is also permissible
to energize the load gradually by setting the voltage to zero, turning on the output,
and stepping the voltage up.)
The voltage, frequency, and current limit may be set at any time during the operation
of the power supply. Press the MODE key to change which parameter is to be
adjusted. Use the SHIFT and MODE keys to select the step size as previously
described. Then the output parameter may be adjusted with the UP/DOWN keys.
3.3 POWER DISPLAY MODE
A useful feature of the PF1352 is the power display mode. In this mode, the output
power in watts and the load power factor are continuously displayed along with
frequency, voltage, and current. When in this mode the UP/DOWN keys are disabled
and will not change output parameters when pressed. Use the MODE key to set the
unit in this mode. A typical power display is illustrated in figure 3-4 below.
V 100
W500
I 5.0
PF1.0
F 400.0 FREQUENCY
POWER
FACTOR
FREQUENCY
POWER IN WATTS
CURRENT

PF1352 USER MANUAL REV A 12/21/15
3.4 OPERATING CONSIDERATIONS
The output voltage and frequency may be varied at any time while the unit is loaded.
It is recommended that the load be disconnected (off) while changing the range setting.
This will prevent potentially damaging transients from reaching the load.
3.5 CURRENT LIMIT AND CONSTANT CURRENT MODE
The PF1352 current limit feature allows the user to preset a current limit point. If the
load current exceeds this value (RMS) the output of the unit will drop to zero and the
display will indicate the event by flashing “O/I”. This condition can be cleared by
pressing the MODE button. This will return the unit back to power on status. If the
current limit is not preset the default value of 10 amps for the 135V range and 5 amps
for the 270V range will be used and the unit will go into a “constant current” mode
when the default value is reached. In this mode, the output voltage will drop in
response to an overload. This action will maintain the current at a fixed value. This can
be a useful feature for trouble shooting. When the unit is in this mode the display will
flash “C/C”. The unit will come out of this mode once the load current is reduced below
the default value.
3.6 OPERATION UNDER FAULT CONDITIONS.
The PF1352 AC source incorporates several modes of protection:
CURRENT LIMIT AND
CONSTANT CURRENT See paragraph 3.5 above.
OVER-VOLTAGE (O/V) If the measured output voltage is 20% higher than
the full scale value, the unit will revert to zero output
and the display will flash O/V. This is a very rare and will
most likely indicate that the unit needs service. Pressing
theMODE button will reset this condition.
OVER-TEMPERATURE If the power amplifier temperature exceeds a safe value, the
output voltage will revert to zero and the display will
flashO/T. Pressing the MODE key will reset this fault
(assuming unit has cooled).
SHORT CIRCUIT In the event that the output is short circuited, the unit will
latch-up and the display will flash O/L. Power must be
cycled to off for a period of about 60 seconds to reset this
fault. If the short is removed, the unit should recover when
switched back on. (Note if the unit has a light load or no load
it may take a as much as 3 minutes for the circuit to reset.
This is due to residual charges left on internal capacitors.)

PF1352 USER MANUAL REV A 12/21/15
These AC power supply models are based on electronic circuits that utilize various
power semi-conductors. As such, there is a limit to the amount of current that can be
supplied. Certain loads may draw short duration, very high peak currents that may
activate protection circuits within the AC power supply. The Model PF1352 incorporates
two distinctive over current circuits. The first responds to massive overloads like short
circuits. This circuit can respond in a few tens of microseconds. Once activated, the AC
output of the power supply is disabled and the front panel display will flash “O/L”.
The second current limit circuit responds to long term overloads. Once the current is
increased beyond the current limit setting, the unit will enter a constant current mode. In
this mode, the output voltage will reduce to limit the current if the load resistance is
reduced further. The voltage will recover automatically once the overload is removed.
The front panel display may flash “C/C” under these conditions depending on the nature
of the overload.
The internal temperature of the unit is monitored. If the temperature rises above a safe
value, the output will be disabled and the front panel display will flash “O/T”. Normal
operation can resume once the unit has cooled to a safe level and the MODE key or
reset button is pressed.
3.7 LIMITING LOAD IN RUSH CURRENTS
Loads that present high inrush currents may be started by limiting the current at start-
up. This can be done externally with a simple series resistor and relay. The resistor is
placed in series with the load for the estimated or measured inrush period. Once the
inrush current has stabilized or tapered off, the relay is used to switch the resistor out of
the circuit. NTC (Negative Temperature Coefficient) “thermistors” may also be used.
These devices start off with a nominal resistance value when cold (off). Once power is
applied the current flow causes the temperature of the resistor to increase which in turn
reduces the value of the resistance. The “hot” value may be several times lower than
the cold value. These devices are available for currents exceeding 15 Amps.
3.8 OPERATION INTO LINEAR LOADS
These models will provide the best overall performance into a linear load. A linear load
is characterized by that fact that its current wave shape is sinusoidal. The phase
relationship between the voltage and current may be anything between zero and 90
degrees (leading or lagging). Some examples of linear loads are as follows: Most AC
Motors, Power Transformers, Heating Elements, Resistors, Capacitors, Most Inductors,
Incandescent Lighting ( without dimmers ), and most Solenoids

PF1352 USER MANUAL REV A 12/21/15
Operation into these types of loads usually causes little interaction with the AC power
supply. The main concern with a linear load is the inrush current associated with it. Most
heating elements and resistors have little or no inrush concerns and usually do not
present any problem for the power source. Inductive and capacitive loads may present
a special problem based on their construction and the way in which they are energized.
Motors and tungsten filament lamps also present some special start-up concerns. The
following is intended to give the end user some insight into applying the AC source to
these types of loads.
3.9 DRIVING REACTIVE LOADS
Capacitors and inductors are reactive in nature. If the load is applied during the peak of
the AC cycle there may be a considerable inrush of current several magnitudes larger
than the steady state current. This current is only limited by any series resistance that
may be present in the load circuit. Under the right conditions, this could trip the overload
protection circuits in the power source. Certain transformers and solenoids (inductance)
present the same problem.
Several methods can be used to prevent tripping the protection circuits in the power
source. One common method is to insert a limiting impedance in series with the load.
This could be a fixed resistor or NTC (negative temperature coefficient) thermistor. Also,
zero crossing switching can be employed. The most obvious way to prevent a high in
rush current is to apply the load with the voltage set to zero (or some low value) and
energize the load slowly by turning up the voltage.
3.10 DRIVING LAMPS
Tungsten filament lamps, when cold, present a very low resistance. Once they are
energized, their resistance quickly climbs to a steady state value. This characteristic
must be accounted for when driving tungsten filament lamps. The same methods for
driving reactive loads can be applied to tungsten.
3.11 DRIVING MOTORS
Driving an AC motor presents a special problem. Most motors require a starting current
that is several times higher than the running current. This current may last for a few
cycles to several seconds depending on the construction and mechanical load on the
motor. This current is sometimes referred to as the motor=s locked rotor current. This
current is not to be confused with the inrush current that usually occurs over the course
of one or two cycles of the AC waveform. The model PF1352's fold back current limiting
can be an advantage when starting motors. During the starting period, the motor will
attempt to draw excessive power from the power source. The fold-back circuit will
reduce the output voltage in order to maintain the maximum current for the range in use.

PF1352 USER MANUAL REV A 12/21/15
3.12 OPERATION WITH REMOTE CONTROL
The PF1352 is available with several remote control options. These are:
1. RS-232 ,USB, or Ethernet computer control (standard)
2. IEEE-488 computer control (I option)
3. 0-10VDC Analog Remote Control (A option)
Each of the options allows control of the following:
1. Output Voltage Setting
2. Output Frequency Setting
3. Output on/off function
4. Output Range function
5. Current limit Setting* (* not available with analog remote).
In addition, the standard versions allow remote monitoring of output voltage, frequency
current, power, and power factor. System status may also be “polled” to check for
operational problems such as overloads or over temperature.
The specific information for each option will be included at the end of this document as
an appendix. Note that only one option may be included. Check the rating label to see if
options have been installed.
ISOLATION AND SAFETY
The provided remote control interface meets the general safety and isolation
requirements of IEC 60950 for class1 equipment. This interface is intended to be
connected to properly grounded “ITE” equipment. Contact Behlman for additional
information.

PF1352 USER MANUAL REV A 12/21/15
SECTION 4
MAINTENANCE AND TROUBLE SHOOTING
4.1 MAINTENANCE
These power supplies are completely self contained solid state devices and do not
require any routine maintenance. When used within their ratings they will provide many
years of trouble free service. The only foreseen maintenance issue would be
maintaining the ventilation “grills”. Any accumulation of dust and debris should be
removed by brushing or vacuuming.
4.2 TROUBLESHOOTING
THESE UNITS DO NOT CONTAIN USER SERVICEABLE PARTS
REFER ALL SERVICING TO QUALIFIED PERSONNEL ONLY. DO NOT REMOVE COVERS
AND DISCONNECT POWER BEFORE REMOVING FOR SERVICE.
Table 4-1 below should be consulted In the event a problem is encountered during the
operation of this power supply.
OBSERVED SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION
No outputs, display indicates V0.0 Voltage not set Set voltage per section 3
Load does not operate, unit
indicates proper output
OUTPUT switch is off, load
not connected between HI
and Lo AC output.
Check load is switched on. Check
load is connected properly, See
section 2 and 3.
AC output low or fluctuates,
constant current C/C flashes
Output overload. Reduce load.
Output voltage does not change Unit in power monitor mode Set to adjust mode, see section 3
Output frequency does not change Unit in power monitor mode Set to adjust mode, see section 3
AC output distorted. Hi harmonic content to load
current. Non-linear load
applied
Check load current waveform.
AC output drops to zero when load
is switched on. Overload “O/L” is
displayed.
Output overloaded or shorted
by large in-rush current.
Check load requirement, see
information in section 3 on starting
difficult loads.
No outputs, no displays, input fuse
blows repeatedly.
Internal fault. Remove unit from use and refer to
qualified service personnel.
Contact factory for service.
WARNING! REPLACE FUSE WITH SAME TYPE AND RATING ONLY.
6.3x32mm cartridge type, 16A / 300VAC min voltage rating