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3.7
Output over current protection (OCP)
When the output current exceeds 125% (typical) of the max-
imum output current, the Main DC Output is switched off.
The characteristic of the OCP function is a hiccup mode.
The Main DC Output automatically recovers when the
overload condition disappears.
Output current
0%
125%
Load
Hiccup interval I = 3.5 s (typical)
Fig. 10: Hiccup mode
The settings for the OCP function cannot be changed by the
user.
If you need to adjust the settings for the OCP function,
please contact Delta.
3.8
Short circuit protection (SCP)
The Short Circuit Protection (SCP) function will shut down
the Power Supply Unit when a short circuit is applied to
the Main DC Output or to the standby power.
The characteristic of the SCP function is a hiccup mode.
After removing the short circuit, the Power Supply Unit
returns to normal operation.
IMA-x1000-xx-Series_Application_Note_V4.0_XX_EN_2019-08-19
Load > 125%
(Output hiccup)
I
t (sec)
Load
3.9
Over temperature protection (OTP)
The Over Temperature Protection (OTP) function shuts
down Main DC Output and Auxiliary DC Output when the
temperature of components inside the Power Supply Unit
is too high.
The OTP function will also occur, and the Main DC Output
be shutdown, when a fan fails or the air flow of the fans is
blocked.
Restarting after OTP shutdown
In case of an output power reduction by the OTP function,
perform the following steps:
1.
Turn off the input voltage.
2.
Eliminate all conditions causing overheating.
3.
Let the Power Supply Unit cool down.
4.
Turn on the input voltage.
3.10
Output power derating versus ambient
temperature
The maximum output power rate depends on on the ambient
temperature. For derating curves see "6. Appendix", p.
Standard mounting orientation
The Power Supply Unit can be operated at full load at
ambient temperatures of up to 50 °C (122 °F).
At ambient temperatures above 50 °C (122 °F), the output
power at the Main DC Output is linearly derated from 100%
at 50 °C (122 °F) to 50% at 70 °C (158 °F).
At ambient temperatures above 70 °C (158 °F), the Power
Supply Unit will be switched off by the OTP function when
components temperature is too high.
Other mounting orientations
The Power Supply Unit can be operated at full load at
ambient temperatures of up to 45 °C (113 °F).
At ambient temperatures above 45 °C (113 °F), the output
power at the Main DC Output is linearly derated from 100%
at 45 °C (113 °F)) to 50% at 65 °C (149 °F).
At ambient temperatures above 65 °C (149 °F), the Power
Supply Unit will be switched off by the OTP function when
components temperature is too high.
Electrical functions
18.
7
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