BK Precision 1657 User Manual

Model: 1657

AC Power Source

USER MANUAL

Safety Summary

The following safety precautions apply to both operating and maintenance personnel and must be
observed during all phases of operation, service, and repair of this instrument. Before applying power,
follow the installation instructions and b e c ome familiar with the operating instructions for this
instrument.

If this device is damaged or something is missing, contact the place of purchase immediately.

This manual contains information and warnings that must be followed to ensure safe operation as well
as maintain the meter in a safe condition.

GROUND THE INSTRUMENT

To minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical
ground. This instrument i s grounded through the ground conductor of the supplied, three-conductor ac
power cable. The power cable must be plugged into an approved three-conductor electrical outlet. Do
not alter the ground connection. Without the protective ground connection, all a cce ssible conductive
parts (including control knobs) can re nder an electri c shock. The power jack and mating plug of the
power cable meet IEC safety standards.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the instrument 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

Instrument covers must not be removed by operating personnel. Component replacement and internal
adjustments must be made by qualified maintenance personnel. Disconnect the power cord before
removing the instrument covers and replacing components. Under certain condit ions, even with the
power cable removed, dangerous voltages may exist. To avoid injuries, always disconnect power and
discharge circuits before touching them.

DO NOT SERVICE OR ADJUST ALONE

Do not attempt any internal service or adjustment unless another person, capable of rendering first aid
and resuscitation, is present.

DO NOT SUBSTITUTE PARTS OR MODIFY THE INSTRUMENT

Do not install substitute parts or perform any unauthorized modifications to this instrument. Return the
instrument to B&K Precision for service and repair to ensure that safety features are maintained.

WARNINGS AND CAUTIONS

WARNING and CAUTION statements, such as the following examples, denote a hazard and appear

throughout this manual. Follow all instructions contained in these statements.
A WARNING statement calls attention to an operating procedure, practic e , or condition, which, if not

followed correctly, could result in injury or death to personnel.
A CAUTION statement calls attention to an operating procedure, practice, or condition, which, if not

followed correctly, could result in damage to or destruction of part or all of the product.

WARNING:

Do not alter the ground connection. Without the protective ground connection,

all

accessible conductive parts (including control knobs) can render an electric shock. The

power jack and mating plug of the power cable meet IEC safety standards.

WARNING:

To avoid electrical shock hazard, disconnect power cord before removing covers. Refer

servicing to qualified personnel.

2

CAUTION:

Before connecting the line cord to the AC mains, check the rear panel AC line voltage

indicator

. Applying a line voltage other than the indicated voltage can destroy the AC line

fuses. For continued fire protection, replace fuses only with those of the specified voltage

and current ratings.

CAUTION:

This product uses components which can be damaged by electro-

static discharge (ESD).

To avoid damage, be sure to follow proper procedures for handling, storing and

transporting parts and subassemblies which contain ESD-sensitive components.

WARNING

HAZARDOUS VOLTAGES IN EXCESS OF 230 Vrms, 400 V peak MAY BE PRESENT WHEN
COVERS ARE REMOVED.QUALIFIED PERSONNEL MUST USE EXTREME CAUTION WHEN
SERVICING THIS EQUIPMENT. CIRCUIT BOARDS, TEST POINTS, AND OUTPUT VOLTAGES
MAY ALSO BE FLOATING ABOVE (BELOW) CHASSIS GROUND.

CAUTION:

Before applying power verify that the product is set to match with the line voltage. Ensure that the AC
power line ground is properly connected to the AC Source input connector. Similarly, other power
ground lines including those to application and maintenance equipment MUST be properly grounded for
both personnel and equipment safety.

Always ensure that AC input power is de-energized prior to connecting or disconnecting the power
cable. Similarly, the AC Source mains switch must be switched OFF prior to connecting or
disconnecting LOADS.

In normal operation, the operator does not have access to hazardous voltages within the chassis.
However, depending on the application configuration, HIGH VOLTAGES HAZARDOUS TO HUMAN
SAFETY may be normally available on the output terminals if it is connected to a load. The User must
ensure that the Source Output lines are properly labeled as to the SAFETY HAZARDS and any that
inadvertent contact with hazardous voltages is eliminated.

For authorized service technicians only: Guard against risks of electrical shock during open cover
checks by NOT TOUCHING any portion of the electrical circuits. Even when power is OFF, capacitors are
well known to retain an electrical charge. Please allow sufficient time for discharge of storage elements
before opening the cover. Use SAFETY GLASSES during open cover checks to avoid personal injury by
any sudden component failure.

Always replace the fuse with the appropriate rating only. Do not operate the instrument in the presence
of flammable gases or fumes.

TABLE OF CONTENTS

Safety Summary ..................................................................................................................................................... 1

C H A P T E R 1 ................................................................................................................................................ 4

1.1 INTRODUCTION ................................................................................................................................ 5

1.2 FEATURES .......................................................................................................................................... 5

1.3 SPECIFICATIONS ............................................................................................................................... 5

C H A P T E R 2 ................................................................................................................................................ 7

2.1 INTRODUCTION ................................................................................................................................ 8

2.2 UNPACKING ....................................................................................................................................... 8

2.3 INPUT POWER REQUIREMENTS .................................................................................................... 8

2.4 INSTALLATION .................................................................................................................................. 9

2.5 TEST EQUIPMENT REQUIREMENTS ........................................................................................... 10

2.6 PACKAGE CONTENTS .................................................................................................................... 10

C H A P T E R 3 .............................................................................................................................................. 11

3.1 FRONT PANEL DESCRIPTION ....................................................................................................... 12

3.2 REAR PANEL DES CRIPTION ......................................................................................................... 12

3.3 INITIAL CHECK ............................................................................................................................... 13

3.3.1 Default Settings .............................................................................................................................. 13

3.3.2 Initial Display ................................................................................................................................. 13

3.4 OPERATING INSTRUCTIONS IN LOCAL MODE ........................................................................ 14

3.4.1 Setting Voltage and Frequency ....................................................................................................... 14

3.4.2 Local Mode setting. ........................................................................................................................ 16

3.4.3 Range Selection .............................................................................................................................. 16

3.4.4 Alarm .............................................................................................................................................. 16

C H A P T E R 4 .............................................................................................................................................. 17

4.1 RS232C INTERFACE ........................................................................................................................ 18

4.2 CONNECTION DETAILS ................................................................................................................. 18

4.3 REMOTE PROTO COLS .................................................................................................................... 19

C H A P T E R 5 .............................................................................................................................................. 28

5.1 MAINTENANCE ............................................................................................................................... 29

5.2 TROUBLESHOOT GUIDE ................................................................................................................ 29

SERVICE INFORMATION ................................................................................................................................. 31

LIMITED ONE-YEAR WARRANTY ................................................................................................................ 31

C H A P T E R 1

General Information

1.1 INTRODUCTION

1.2 FEATURES

1.3 SPECIFICATIONS

5

1.1 INTRODUCTION

The 1657 is an AC power source that provides high conversion efficiency and
low distortion output. It has a universal line output terminal and has a built in
PFC to provide an input power facto r of 0.99 at full load. The output A C provides
up to 1500 VA and can be set to two voltage ranges, 135 V and 270 V. Front
panel buttons and control knob is available for quick voltage and frequency set.
A RS232 interface port is provided in the rear panel for remote programmability.

1.2 FEATURES

• Low distortion sine-wave output with programmable frequency and
voltage.

• Selectable two output voltage ranges: 135VAC or 270VAC

• Settable frequency from 45Hz to 450 Hz.

• Built-in torroidal isolation transformer.

• Automatic protection against overload, short circuit and over

temperature.

• Bright VFD display

• Remote Programming through RS 232 serial interface.

• Built in PFC provides 0.99 input power factor.

• Conforms to EN 55022, class A, safety standard EN 60950.

1.3 SPECIFICATIONS

The operation specifications are listed below. All specifications are tested at the
output terminal, with temperature at 25 °C ± 5°C, nominal input of 120V

AC/230V AC and output of 250VAC /125VAC, and at 50Hz/60Hz with a resistive

load.

Model

1657

INPUT

Voltage

90 – 264 VAC single phase
100 – 264 VAC for continuous full load operation

Frequency

47 – 63 Hz

Current

20A Max.

Power factor

0.99 typical. @115 VAC 60 Hz, Full Load

Efficiency

> 85% at full load & nominal line input

OUTPUT

Output Power

Maximum Power

1500 VA

Accuracy

+/- 2% of F.S.

Resolution

1 W

Output Voltage

6

Low Range

0 - 135 Vrms

High Range

0 - 270 Vrms

Accuracy

+/- 1% of F.S.

Resolution

0.1 V

Distortion

< 2% @ 220 VAC, 50 Hz Full Load
Worse case: < 5% @ 270VAC, 450 Hz, Full Load

Line Regulation

+/- 0.1% of F.S.

Load Regulation

+/- 1% of F.S.

Temp Coefficient

0.05% per °C from 25 °C

Output Current

Low Range (135 V)

12 Arms (Limited to 1500 VA)

High Range (270 V)

6 Arms (Limited to 1500 VA)

Accuracy

+/- 1% of F.S.

Resolution 0.01 A

Crest Factor

3

Power Factor

0.8 Lag to 0.8 Lead

Output Frequency

Range

45 – 450 Hz

Accuracy

0.2% of F.S.

Resolution

0.01 Hz

Supplemental Characteristics

Protections Output

Trip

with

Alarm

indication for

OL, SC,

OTP

Output Connection

Universal socket

Cooling Internal force cooling

Note: Provide sufficient space around air inlets
and outlets for proper cooling

Weight Approx.

Approx. 24 kg (53 lbs)

Dimensions

88.0 mm (H) x 482.6 mm (W) x 500.0 mm (D)

3.46” (H) x 19” (W) x 19.7” (D)

Safety & EMC

EN 60950 & EN55022 Class A

Environment al Condit ions

Operating
Temperature

0 – 45 ° C

Storage

Temperature

-20 to +60° C

Humidity

< 90% non-condensing

7

C H A P T E R 2

Installation

2.1 INTRODUCTION

2.2 UNPACKING

2.3 INPUT POWER REQUIREMENTS

2.4 INSTALLATION

2.5 TEST EQUIPMENT REQUIREMENTS

2.6 PACKAGE CONTENTS

8

2.1 INTRODUCTION

The 1657 is configured, calibrated and tested prior to shipment. This
instrument is therefore ready for immediate use upon receipt. The initial
physical inspections should be made to ensure that no damage has been
sustained during shipment.

2.2 UNPACKING

Inspect the shipping container before accepting it from the carrier. If damage
to the container is evident, remove the instrument from the container and
visually inspect it for damage to the instrument case and parts.

If damage to the instrument is evident, a description of the damage should be
noted on the carrier's receipt and signed by the driver or carrier agent. Save all
shipping containers and material for inspection. Forward a report of any
damage to the factory or the agent through which the unit is procured.

Retain the original packing container if subsequent repackaging for return to
the factory were required. Repackaging is straightforward and is essentially
the reverse of the unpacking. Should only a sub-assembly need to be
repackaged for re-shipment, use the original containers.

Remove the Source module from its shipping container and inspect for any
damage to the front panel switches and display module. Check the rear of the
instrument for damage to Sockets, Fuse Holders and Terminals etc. Also check
for any optional parts, which have been ordered by you. If any of the part is
damaged or broken then DO NOT switch-ON the instrument.
Next, you MUST become familiar with the unit configuration.

2.3 INPUT POWER REQUIREMENTS

The Model 1657 is configured at the factory to operate from 90 to 264 VAC, 1 Ф
(phase), 47-63 Hz power line. The AC line input connector is type IEC320-C19.

CAUTION: THE AC SOURCE WILL BE DAMAGED IF IT IS OPERATED

AT AN INPUT VOLTAGE THAT IS OUTSIDE ITS CONFIGURED INPUT
RANGE.

FUSE

The AC power source uses a Type F 20 A fuse that is located in the fuse holder
at the rear panel of the unit. Please check the fuse before powering on the
instrument.

9

2.4 INSTALLATION

1. AC Input Power Connection

Connect the provided power cord into the input socket on the rear panel.
Before connecting to an electrical outlet, ensure the following:

a) The available line supply is compat ible to your unit, meaning the voltage

and frequency must meet within the input specification operating range.

b) The available line supply is capable of supplying the maximum peak

current and power of the power supply.

WARNING: TO PROTECT THE OPERATORS, THE WIRE CONNECTED

TO THE GROUND TERMINAL MUST BE CONNECTED TO THE EARTH
GROUND. UNDER NO CIRCUMSTANCES SHOULD THIS AC SOURCE BE
OPERATED WITHO UT A N A DEQUATE GROUND CO NNECTION.

2. Load Connections

A universal socket is provided on the rear panel for the output load
connections. Selection of Input Power and Load connection cabling should
follow good practice specific to the appl ication. An output cable sho uld be able
to handle the full load current and maximum voltage and po wer under worst­case conditions of temperature, humidity, mechanical abuse, and effects of
long-term aging.

3. Turn-On

WARNING: BEFORE TURNING ON THE INSTRUMENT, ALL

PROTECTIVE EARTH TERMINALS, EXTENSION CORDS AND DEVICES
CONNECTED TO THE INSTRUMENT MUST BE CONNECTED TO A
PROTECTIVE EARTH GROUND. ANY INTERRUPTION OF THE
PROTECTIVE EARTH GROUNDING WILL CAUSE A POTENTIAL SHOCK
HAZARD.

a) Monitor the output voltage with a true RMS multimeter. Keep the

output ON/OFF switch to OFF positi on .

b) Turn the input power on through the input rocker switch. This will light

the front panel display. The display will show the model No. software
version No. , last set values of parameters, and the actual output
parameters.

c) There is a small delay between the time the last set values are

displayed until they are available on the output (Approx. 3 to 5
Seconds). After the output voltage has stabilized, set the voltage & the
frequency to the desired value & turn the output ON.

d) Load the output with a res istive load. If the output current exceeds the

maximum specified current limit, the alarm LED will turn on and output
will turn off (Overload trip) after some delay. This can be reset by
pressing the RESET button on the front panel.

10

NOTE: Allow sufficient OFF time once the output is TRIP’ed by abnormal
condition (Over temperature and/or Over load) before operating again.

e) Select the 135V range by using the front panel range button. Repeat

the above procedure, and check that all output paramete rs are co rrect.
If all the above parameters are correct, the unit is ready for operation.

2.5 TEST EQUIPME NT REQUI REM E NTS

The following instruments will be required to test the complete installation of
the unit.

1) A 4.5 digit or bette r true RMS digital multimeter for verifyin g the input
and the output voltage and frequency of the unit.

2) Current meter for measurement up to at least 15 A or a standard current
transformer with the suitable burden with a four and half digit or better
digital multi-meter with true RMS measurement.

3) Power meter with suitable rating for input & output parameter testing.

4) A load to test and verify the operation on full load.

2.6 PACKAGE CONTENTS

The AC source is shipped with the following contents:

• 1657 AC Power Source

• User Manual

• AC Power Cord (type IEC320-C19)

Please locate each item from the original packaging and contact B&K Precision
immediately if something is missing.