250-VA DC-TO-AC INVERTER - Wilmore Electronics Co., Inc.
MODEL 1652
DC-AC INVERTER
ELECTRONICS CO., INC.
P. O. Box 1329, Hillsborough, N. C. 27278, U.S.A.
BULLETIN NO. 4071B
250-VA DC-TO-AC INVERTER
120-VAC, 60-Hz OUTPUT
Model 1652-24-120-60-U
FEATURES
• 12, 24, 48 OR 130 VDC INPUT
• HEIGHT 1.75” (1 RACK SPACE)
• ISOLATED, REGULATED
FREQUENCY-STABLE OUTPUT
• 82%-90% EFFICIENT
• CONVECTION COOLED
• AVAILABLE WITH INTEGRAL
HIGH-SPEED TRANSFER
SWITCH FOR UPS/STANDBYPOWER APPLICATIONS
Designed for space-limited applications within the
telecommunications, data-processing and utility industries,
the 250-VA Model 1652 dc-to-ac inverter occupies only 1.75
inches (1U) of vertical rack space. The inverter provides a
well-regulated 120-Vac, frequency-stable 60-Hz quasi-sinewave output and is available in 12, 24, 48 and 130-Vdc input
versions. Compatible with either 19-inch or 23-inch equipment
racks, the inverter can operate at maximum rated power with
simple convection cooling.
The conservatively rated Model 1652 is well suited for
powering a variety of loads, from sensitive electronic equipment
to small motors and other nonlinear loads. It is available as a
plain inverter or with built-in automatic load switchover features
to permit operation in UPS or standby-power modes.
Table 1
Nominal
Input Voltage
(Vdc)
12
Input
Voltage Range
(Vdc)
10.5 - 16
Input Current
No Load1
(Adc)
0.52
Input Current
Full Load2
(Adc)
28.6
48
42-58
0.13
6.8
24
130
21-29
105-145
0.25
0.05
13.9
2.7
Efficiency2
Model Number3
83%
1652-12-120-60
86%
88%
88%
1652-24-120-60
1652-48-120-60
1652-130-120-60
Typical at no load and nominal input voltage
Typical at full load and minimum input voltage
3
See reverse side for complete model numbering information
1
2
DESIGNERS AND MANUFACTURERS OF SOLID-STATE POWER CONVERSION EQUIPMENT
Top View
SPECIFICATIONS
Input Voltage and Current
The nominal input voltage, the input
voltage range, the no-load input current
and the full-load input current are shown
in Table 1.
Output Voltage
118 Vac nominal1, single phase
Frequency
60 Hz nominal ±0.05 Hz maximum
variation over the full range of load and
input voltage changes. Temperature
coefficient is ±0.02% maximum per°C.
Volt-Ampere Rating
250 VA
Output Voltage Regulation
±0.2% versus dc input line
±2.0% versus load
Output Voltage Wave Shape
Three-level stepped approximation to a
sine wave with peak, average and rms
values approximating those of a sine
wave.
Operating Temperature Range
For 24, 48 and 130-Vdc input versions:
-30°C to +60°C
For 12-Vdc input versions:
-30°C to +40°C (for operation up to
+60°C, derate the output volt-ampere
rating linearly to 175 VA)
Storage Temperature Range
-40° C to +95°C
Protection
Protection against overloads and
accidental short-circuit of the output is
provided electronically, and recovery is
automatic upon removal of the abnormal
load. A front-panel circuit breaker
in series with the dc input provides
protection against accidental reversal of
input polarity during installation.
Front-Panel Controls and Indicators
A combination circuit breaker and ON/
OFF switch is provided for input power.
L and U versions include an ac-line fuse
and three LED status indicators.
Mechanical Description
Figure 1 provides overall dimensions.
Weight is approximately 10 lbs. Brackets
are provided for 19-inch or 23-inch rack
mounting.
As measured with a conventional averageresponding, rms-calibrated voltmeter
1
Rear View
Figure 1. Outline dimensions. Inverter shown is U or L version.
Standard Configurations
P VERSION: Adding the suffix P to the
basic model designates a plain inverter,
i.e. a unit with no internal inverter-toline or line-to-inverter transfer switching
provisions. (“Line” refers to commercial ac
power.) This version does not have the
three front-panel LED status indicators,
ac-line fuse or alarm contacts.
U VERSION: Adding the suffix U to the
basic model number designates the
inverter-preferred UPS configuration.
In this configuration, the load power
is normally provided by the inverter.
However, if the inverter output is
interrupted, an internal transfer switch
automatically transfers the load from the
inverter to commercial ac power. The
transfer time between inverter and line is
short (2 msec. typical) and such transfers
are normally not detected by even highly
sensitive loads. This version includes
auxiliary Form C contacts for remote
indication of alarm conditions, three frontpanel LED status indicators and an acline fuse.
L VERSION: Adding the suffix L to the
basic model number designates a unit
which is identical to the “U” version except
that, in the L configuration, the load power
is normally provided by the commercial
ac line and the inverter operates in
the standby mode. If commercial ac
power is interrupted, an internal transfer
switch automatically transfers the load
to the inverter. Upon restoration of
commercial ac power, there is a delay of
approximately five seconds, the load is
then transferred back to commercial ac
power and the inverter again operates in
the standby mode. Other features such
as transfer speed, alarms, indicators, etc.
are the same as in the U version.
Model Numbering Information
For ordering purposes the Model 1652
should be identified by an expanded
model number consisting of four numbers
followed by a letter suffix. In sequence,
they designate:
• basic 250 VA inverter type (1652)
• nominal input voltage (12, 24, 48 or 130)
• nominal output voltage (120)
• output frequency (60)
• configuration (P, U or L version)
For example, the correct part number for
a 48-volt input, inverter-preferred UPS
configuration is Model 1652-48-120-60-U.
OTHER WILMORE PRODUCTS
For information about other Wilmore dcto-ac inverters or for information about
other power conditioning products such as
switching power supplies, dc-to-dc converters and uninterruptible power systems,
please contact our sales department.
Information provided in this bulletin is subject to
change without notice.
WILMORE ELECTRONICS COMPANY, INC.
P. O. Box 1329, Hillsborough, N. C. 27278 • Telephone (919) 732-9351 • FAX (919) 732-9359
www.wilmoreelectronics.com
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