LMX SERIES® OPERATION MANUAL
SECTION 4: Technical Specifications
Entire Contents Copyright
2018 by Pacific Power Source, Inc. (PPS) • All Rights Reserved • No reproduction without written authorization from PPS.
LMX Series Power Source Operation Manual
Page 41 of 463
± Limits
0 - Max Limits
± Limits
0 - Max Limits
Models
Phase Mode
Real Time R
+/- Ohms
Real Time L +
µ
H
RMS R +/-
Ohms
RMS L +
µ
H
Single Phase
20.000
10.000
20.000
10.000
Table 4-1: Programmable Impedance Ranges by Phase mode
4.5
Low Frequency Operating in Transformer Coupled Mode
LMX-Series output transformers are designed to operate from 45 to 5,000 Hz. In the case of
steady-state sine wave output, operation at frequencies as low as 30 Hz (125 Vac primary
voltage) is possible.
Operation at lower frequencies - below 30Hz - may cause saturation of the output
transformers, but at reduced output voltages, lower frequency operation is possible. The
Volt*Second Product of the output
MUST NOT
exceed the maximum Volt*Second rating of
the transformer to prevent saturation of the transformers when operating at lower
frequencies.
For example, to determine the value of reduced voltage at 20Hz operation of the
transformer described above:
1. Calculate the Volt
Second Product maximum value of the transformer at 30Hz and 125
Vac
Calculate the reduced output voltage value at 20Hz with maximum Volt
Second Product
value
Therefore, to prevent output transformer saturation at 20Hz operation, the maximum
primary voltage of the transformer should be 82.5Vac.
Systems with transformers connected to the output require special attention when
designing transient profiles (applicable to systems w/UPC). It is possible to design transients
in which the DC Component of the periodic waveform is not zero. Attempting to push DC
voltage through the transformer will cause saturation of the transformer. However, the
output transformers are designed to support a single event, half-cycle dropout at 125 Vac
primary voltage at 50 Hz without saturating. Continuous operation with an asymmetrical
waveform (DC component
≠
0 Vdc) will cause saturation however.
sec
033
.
0
30
1
1
30
=
=
=
Hz
Freq
T
Hz
sec
125
.
4
125
033
.
0
30
max
•
=
×
=
×
=
•
volt
V
T
Sec
Volt
rms
Hz
sec
050
.
0
20
1
1
20
=
=
=
Hz
Freq
T
Hz
volts
volt
T
Sec
Volt
Volts
Hz
5
.
82
sec
050
.
0
sec
125
.
4
20
max
=
•
=
•
=
