4.5 Overvoltage protection
¡
When the overvoltage protection activates, outputs on all output
modules will shut down.
When either one of the following actions is taken, the output will
recover.
1
Turn the input voltage off and solve all of overvoltage cause.
Then, turn the input on after ten seconds.
2
Turn all outputs off by GI terminal and solve all of overvoltage
cause.
Then, turn all outputs on by GI terminal after ten seconds.
*
The recovery time varies depending on such factors as input
voltage.
¡
If the external voltage was applied to the output of the power sup-
ply, the internal components might be damaged.
4.6 Output ripple and ripple noise
¡
The measurement environment would affect the output noise.
Fig.4.1 is the recommended measurement method.
+Vout
-Vout
Load
150mm
C
1
Osiloscope/
Ripple noise meter
Bw:20MHz
Differential probe
+
C
1 :
Aluminum electrolytic capacitor 22μF
Fig.4.1 Measuring method of Ripple and Ripple Noise
Remarks :
The output ripple and noise might not be measured correctly by
the flux of magnetic force from the power supply which crosses
the ground wire of the probe.
Bad example
Good example
Fig.4.2 Example of measuring output ripple and noise
4.7 Output voltage adjustment
¡
To increase the output voltage, turn the built-in potentiometer
clockwise.
To decrease the output voltage, turn it counterclockwise.
4.8 Remote ON/OFF(RC)
¡
Each output module have remote ON/OFF functions. The output
voltage can be turned on/off by the signal to RC terminal in CN3
on each modules.
¡
The remote ON/OFF circuit (RC, RCG) is isolated from the input,
the output, FG and other function terminals.
¡
Auxiliary power (AUX) for remote ON/OFF.
The power supply has the auxiliary power (AUX) for the remote
ON/OFF.
The auxiliary power (AUX) is isolated from input, output, and FG.
Fig. 4.3 is the example of the remote ON/OFF with AUX.
¡
Please note the followings for the remote ON/OFF function.
1
The output stops when 4.5V to 12.5V of the voltage is applied
to RC.
2
The built-in fan does not stop even if the output is turned OFF
by the remote ON/OFF.
3
When the output is turned off by the remote on/off, the LV alarm
will be delivered.
4
This function individually operates on each output module.
¡
The Remote ON/OFF circuit on each output module can operate
individually.
The detail of the “Global inhibit function” to turn all output modules
off at the same time is shown in the item 4.9.
CN3
CN1
RC
AUX
AUXG
RCG
SW
Output module
Output
on
Output
off
Ri=
1.8KΩ
Fig.4.3 Example of remote ON/OFF
Table 4.1 Remote ON/OFF specification
Connection method
Fig4.3 Remote SW
SW
Logic
Output on
SW open
(0-0.5V between RC and RCG)
Output off
SW short
(4.5-12V between RC and RCG)
Bases pin
CN3 RCG
4.9 Global inhibit (GI)
¡
The unit has the Global inhibit function.
Global inhibit is the control signal input which turns all outputs off
by supplying the current into GI2.
Table 4.2 is specifications and Fig.4.4 is use examples for Global
inhibit.
¡
The Global inhibit circuit (GI2, GIG) is isolated from input, output,
FG, AUX and other function terminals.
¡
Please note the followings when using the Global inhibit function.
1
The output can be turned off by supplying the current into GI2
pin.
2
The current into GI2 pin is 3mA typ (12mA max).
3
The PR signal will get “High” when all output modules are
turned off by the Global inhibit function.
AC-DC Power Supplies Configurable Type
Instruction Manual
AME-12
