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DOC-MN-008-03, VCCS300 User Manual
Power Ratings
VCCS300 series products must always be operated within stated operating limits. Equipment manufacturers and other users must take the appropriate derating into
account when specifying a unit for the intended application. If in doubt, contact your sales representative or Vox Power for assistance.
The relevant deratings for the VCCS300 series power supplies are detailed below,
Mains Voltage Derating
(4)
Mains Voltage Derating Table
Mains Voltage (V
RMS
)
Output Power
(%)
120
300
100%
110
275
91.7%
100
250
83.3%
90
225
75.0%
85
212.5
70.8%
The output power must be de-rated by 2.5% for every 3 volts below 120V
RMS
, down to a
minimum of 85V
RMS
.
Thermal Derating - Conduction & Forced Air Cooled
(3,4)
Thermal Derating Table – Conduction & Forced Air
T
AMBIENT
(°C)
Conduction (%)
Forced Air (%)
-40
100%
100%
40
100%
100%
50
83.3%
100%
70
50.0%
50%
1.
The conduction cooled rating for all models applies under the following conditions.
Baseplate temperature
(2)
≤ T
AMBIENT
+ 15°C
2.
The forced air rating for all models applies for 1MS
-1
(200LFM). See
Mechanical
Dimensions and Mounting
section for Airflow direction.
3.
Mounted with baseplate at the bottom, 40mm above surface.
Thermal Derating - Convection Cooled
(3,4)
Thermal Derating Table – Convection
Ambient Temperature
85V
RMS
(2)
(%)
120V
RMS
(%)
220V
RMS
(%)
-40
100%
100%
100%
-5
100%
100%
100%
5
100%
92%
100%
10
100%
88%
94%
20
90%
80%
85%
30
80%
70%
75%
40
67%
59%
65%
50
50%
47%
53%
60
25%
33%
40%
70
18%
18%
25%
•
The convection cooled rating applies under the following conditions,
No forced airflow or conduction cooling. The VCCS300 is mounted horizontally.
•
Mains voltage deratings apply at 85V
RMS
.
Notes:
1.
Ambient air temperature is the air temperature immediately surrounding the PSU. If the PSU is mounted within an enclosure, the internal enclosure ambient
temperature should be used.
2.
Baseplate temperature is measured at baseplate temperature sensing location TP1. See
Mechanical Dimensions and Mounting
section for Airflow direction.
3.
Thermal deratings are derived from maximum component temperatures under controlled conditions. Component temperatures must be verified in the end
application as described in the “Component Temperatures” section of the user manual.
4.
Mains Voltage deratings are cumulative with thermal deratings.
60
65
70
75
80
85
90
95
100
105
110
80
100
120
140
160
180
200
220
240
260
280
Out
put
P
owe
r r
at
ing (
%
)
Input Voltage (RMS)
Mains Voltage Derating
0
10
20
30
40
50
60
70
80
90
100
110
-40
-30
-20
-10
0
10
20
30
40
50
60
70
Out
put
powe
r r
at
ing
(%
)
Ambient Temperature (Celcius)
Thermal Derating - Conduction & Forced Air
FORCED AIR
CONDUCTION
0
10
20
30
40
50
60
70
80
90
100
110
-40
-30
-20
-10
0
10
20
30
40
50
60
70
Out
put
powe
r r
at
ing
(%
)
Ambient Temperature (Celcius)
Thermal Derating - Convection
85V
120V
220V
