Electrical Installation; General Requirements; Power Supply - PowerTec 2000C Instruction Manual

4.1 GENERAL REQUIREMENTS

After manufacturing and testing, the most
important time in the useful life of a motor or motor
control is the installation process. Decisions are
made, or not made, on all of the considerations which
are to be involved in the environment in which the
motor and control will spend their operational life.
Issues ignored during installation are sure to crop up
at a later time, and the time and manner in which they
crop up may be very inconvenient and/or very pain-
ful, not to mention very costly.
POWERTEC motors and controls require no more
care and concern in the installation than any other precise
motor and control, although they do require more consid-
eration of the environment than run-of-the-mill motors and
controls which do no more than run a motor, period. If
superior performance is expected, then it is normal to
expect superior care in installation.
One of the most frequent problems encountered with
digital type equipment is electrical noise. Noise is an
insidious problem which is capable of causing not only
destructive problems, but also intermittent, annoying prob-
lems. The methods used in the installation of the equipment
plays a large part in prevention of electrical noise interfer-
ence in the operation. Any digital type control requires that
extra care be taken in the grounding of the equipment, the
shielding of wires and cables and placement of wires in the
conduit runs. Pay attention to the sections which address
the precautions against noise, whether in the control, in the
motor, in the wiring, or in any auxiliary equipment. Follow
the directions of other manufacturers for other equipment
that come with the other equipment to be used in the
system.

4.2 POWER SUPPLY

The POWERTEC Models 2000C and 3000C Brush-
less DC motor controls require a source of three phase
input power with a KVA rating at least equal to its horse-
power rating. The branch service rating (in KVA) supply-
ing the control should not be more than 10 times the rating
of the control, or special disconnecting means ratings or
sizes may be required. The standard Model 2000C and
3000C will not operate on single phase power.
TION TRANSFORMER is not necessary for the operation
of the POWERTEC Brushless DC motor control, but, if it
is desired to use one, or if one is required by local code
requirements, it should be sized (in KVA) at least as large
as the horsepower rating of the motor control.
© copyright 1992, 1996 by Powertec Industrial
Motors

4.0 ELECTRICAL INSTALLATION

The fuses which are supplied on the input of the
Brushless DC motor control are designed to protect the
semiconductor elements of the unit. THEY MAY OR
MAY NOT MEET THE REQUIREMENTS OF NA-
TIONAL, STATE AND/OR LOCAL CODES.
The responsibility for meeting the branch service
protection and other code requirements of national, state
and local codes belongs to the user.
Since POWERTEC controls are supplied without
input disconnects, the user must supply a disconnecting
means which meets applicable code requirements. The
maximum interrupting capacity (AIC) of the fuses on the
input of the Models 2000C and 3000C is 200,000 amperes.
If the maximum short circuit current available on the
service is greater than this, a disconnect with an AIC rating
greater than 200,000 amperes will be required.
Wire sizes for the input of the control may be
determined by the fuse sizes on the control. The output
current of a Brushless DC motor control is always greater
than the input current. Check the nameplate of the control
for input current requirements and output current limita-
tions.
NOTICE:
BRUSHLESS DC MOTOR CONTROL IS NOT REP-
RESENTATIVE OF THE LOAD CURRENT ON THE
MOTOR! The input current is representative of the
POWER output of the motor. The only point at which
the input AC line current reaches full value is when
the motor is operating at full speed with full load.
DO NOT ATTEMPT TO MEASURE MOTOR LOAD
BY MEASURING THE AC INPUT LINE CURRENT
TO THE BRUSHLESS DC MOTOR CONTROL.
The tolerance of the input voltage to the Brushless
DC motor control Models 2000C and 3000C is plus ten
percent (+10%) to minus five percent (-5%) of the nominal
voltage listed on the nameplate of the control. Measuring
the voltage at the input to the control when the control is off
neglects the effects of load on the power source. The actual
input voltage to the control should be measured while the
control is operating the motor in a loaded condition.
Transient power line disturbances of a minor nature
An ISOLA- will not normally disturb the motor controls. Nor do they
generate significant noise back onto its power service.
Any effects which tend to distort the AC waveform
may, however, be detected as an under-voltage or phase
loss condition. Some types of motor controls with diode
front ends may tend to flatten the peak of the AC sine wave,
THE INPUT CURRENT OF THE
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