Delta 23-730 User Manual Page 2

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Operation With Switchmode Power Supplies
If an MCR is used as a source for a switchmode power
supply, a slight amount of ringing may be noticed on the
sine wave output of the MCR at half cycle intervals for a
short duration. This ringing occurs at the point when the
switchmode power supply current demand drops to zero.
The ringing need not be a cause for concern since it is of
relatively low magnitude and frequency. Both series have
been tested with a variety of switchmode power supplies
and it has been determined that the ringing never affected
the DC outputs, nor has it been found to degrade the
components of any switchmode power supply.
Effect of Frequency
Changes in the frequency of the supply voltage will be
directly reflected in the output voltage. A change of about
1.8% in output voltage will occur for every 1% change in
input frequency, and in the same direction as the
frequency change.
Sola/Hevi-Duty – The Power Quality Experts
Toll-Free (800) 377-4384
FAX: (800) 367-4384
www.solaheviduty.com
P/N 272-37066-1
Rev. 2 (February 15, 2006)
50 Hz Mini/Micro Computer Regulator (MCR)
Installation and Operation Manual
Field Replacement of Capacitors
Capacitors used in all regulators are the highest commercial
grade. Each one is given a rigid acceptance test upon
receipt. Nevertheless, as with all capacitors, there is a
certain small percentage of failure. The Sola guarantee
includes free replacement at the factory of any capacitor
unit which fails within one year of sale. Older units can be
replaced at moderate charge.
Where competent technical help is available, it may be
possible to test and identify defective capacitors in the field,
and to make replacement with new capacitors shipped from
the factory. In all such cases, factory advice and cooperation
must be requested in advance.
Warranties
Sola/Hevi-Duty warrants its standard catalog products to
be free from defects in materials and workmanship and
agrees to correct by repair or replacement, at the option of
Sola/Hevi-Duty, products that may fail in service provided
the product has been installed, operated and maintained in
accordance with accepted industry practice.
Warranty begins at the date of manufacture and is according
to the following schedule:
1. Standard catalog transformer and single phase, power
conditioning products – 10 years plus an additional
2 years if the registration card enclosed with the
transformer is completed and returned to Sola/Hevi-Duty
within 14 days after installation.
2. Products manufactured to a purchaser’s
specifications – 1 year.
Return Policy
Most instances of initial failure to operate properly can
be remedied through a telephone conversation between
the user and Technical Service. If it is determined that a
product must be returned, contact your local Sola/Hevi-Duty
distributor for a Return Authorization. If the distributor is
unknown, contact Customer Service at (800) 377-4384
for instructions.
All returns to the Sola/Hevi-Duty factory must have a Return
Authorization (R.A.#).Information required for a Return
Authorization (R.A.#):
1. Sola catalog number and/or model number
2. Serial number
3. Company name, address, phone number and
contact person
4. Proof of purchase from Distributor
5. Description of problem
For proper handling upon receipt at Sola/Hevi-Duty, the
R.A.# must be clearly placed in several locations on the
outside of the package. Sola/Hevi-Duty is not responsible
for damage on returned goods not packaged properly or
customer-abused units.
Operating Notes and Data
Safety Notice
High voltages are present inside the MCR. Do not reach
inside the unit while it is energized. To measure voltage,
de-energize the unit, connect the meter, and then
re-energize the unit. These units contain no
user-serviceable parts.
Checking with Voltmeters
All input and output voltage measurements should be made
with a true RMS-responding voltmeter. A certain amount of
harmonics in the output may cause other types – particularly
rectifier types – to give inaccurate indications.
Rating and Characteristics
The MCR series are built for several VA ranges. See the
silkscreen of each regulator for appropriate data.
Load Regulation
Changes in output voltage resulting from changes in
resistive loads from no load to full load (100% P.F.) are
approximately four percent.
Effect of Load Power Factor
“Median” value of output of voltage will vary from silkscreen
rating if the load has a power factor other than that for which
the transformer was designed. Load regulation will also be
greater as the inductive load power factor is decreased.
However, the resulting median values of output voltage will
be regulated against supply line changes at any reasonable
load or load power factor.
Operation With Motor Loads
Because of the current-limiting effect described above,
special attention should be given to motor applications. In
general, the regulator must have a load rating nearly equal
to the maximum power drawn during the starting cycle. This
may run from two to eight times the normal (running) rating
of the motor. In doubtful cases, it is advisable to measure the
actual starting current.
Operating Temperature
Standard units are designed to operate in ambient
temperatures of minus 20°C to plus 50°C. In operation, a
temperature rise will occur whether or not the transformer
is serving load. Normally, this rise may fall anywhere in the
range of 45°C to 110°C, depending on the regulator type and
rating. In any case, the maximum operating temperature at
an ambient of 50° is always within safe operating limits for
the class of insulating material used.
Effect of Temperature
The output voltage will show a small change as the unit
warms up to stable operating temperatures at a constant
ambient temperature. This change may be about on or
two percent, depending on the unit’s VA rating. At a stable
operating temperature, the output voltage will change slightly
with varying ambient temperature. This shift is approximately
one percent for each 40°C of temperature change.
Servicing
Because the Sola MCR is a simple, rugged device without
moving parts or manual adjustments, no routine servicing
or maintenance is needed. In case of apparent poor
performance, the user is urged to check the following
points immediately:
Troubleshooting
A. Nominal Voltage Too High
1. The load may be considerably less than full rating.
(See “Load Regulation”, Page 10).
2. The load may have a leading power factor.
B. Nominal Voltage Too Low
1. Load power factor may be lagging.
2. Unit may be slightly overloaded.
(See “Current Limitation”, Page 12).
C. Does Not Regulate Closely
1. Unit may be slightly overloaded.
(See “Current Limitation”, Page 12).
2. Actual line voltage swings may be outside the rated range
of unit, particularly on low side.
3. On varying loads, a certain amount of load regulation
may be mixed with the line voltage regulating action.
(See “Load Regulation”, Page 10).
D. Output Voltage Very Low (20-60V)
1. Unsuspected or unplanned overloads of substantial size
may occur intermittently (motor-starting currents, solenoid
inrush currents, etc.). See “Current Limitation, Page 12.
2. One or more capacitor units in the regulator may
be defective.
E. No Output Voltage
1. Check power source breakers or fuses.
2. Check input switch.
3. Check continuity between input terminals, and also
between output terminals.
4. For units with output circuit breaker, reduce load and
reset circuit breaker.
F. Transformer Operating Temperature
1. The transformer used in the regulators is designed to
operate at high flux density, and hence, relatively high
temperatures. After connection to line for a half-hour or
so, the transformer core structure may be too hot to touch
with bare hand. This is normal and need give no concern.
Note
In case regulator is operating but does not appear to have
correct output, it is very helpful to apply the
following test:
1. Disconnect the working load.
2. Connect a dummy load of lamps, heaters, or other
resistive load substantially equal to the full-load rating of
regulator, directly across its output terminals.
3. Measure the output voltage of the regulator using a true
RMS type voltmeter directly across its output terminals.
This test will usually establish whether the apparent poor
performance is due to a fault in the regulator or
to some peculiarity of the working load.
Response Time
An important advantage of the Sola principle of static
magnetic regulation is its exceedingly fast response time
compared with other types of AC regulators. Transient
changes in supply voltage are usually corrected with 1-1/2
cycles or less; the output voltage will not fluctuate more than
a few percent.
Input Characteristics
The MCR regulator transformer includes a resonant
circuit, which is energized whether it is serving load or not.
Therefore, the input current at no load is approximately 35%
of the full-load level, even at light or no load. Input power
factor will average 90-100% at full load, but may drop to
about 75% at half load and 25% at no load. In any case, it is
always leading.
Current Limitation
When the load is increased beyond the MCR rated value,
a point is reached where the output voltage suddenly
collapses and will not regain its normal value until the load
is partially released. Under short circuit conditions, the load
current is limited to approximately twice of the rated full-load
value, and the input power to less than 10% of normal. The
MCR will protect both itself and its load against damage from
excessive fault currents. Fusing of load circuits is
not necessary.
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