9
3.6
Fan Speed Control
3.7
Short Circuit Protection & Over Current Protection
3.8
Over Voltage Protection (OVP)
3.9
Over Temperature Protection (OTP) and Alarm
◎
Built-in fan speed control circuit, fan speed changes
epending on internal temperature.
automatically d
◎
The protection activates when the output is short-circuited or the output current exceeds 110%±5% of the rated output current. Re-power on to recover
when the short-circuit/overload condition is removed.
◎
O
DRP 3200
nly for
-
.
◎
Built-in 2 sets of thermal detection circuit, once the internal temperature exceeds a threshold value, the unit will shut down automatically (the fans will
s
still be operating to cool down the unit). Please switch off the AC input, remove all possible causes and then leave the units cooling down to normal
a
working temperature (approximate 10 minutes – 1 hour) before repower on again.
◎
℃
When the internal temperature reaches 60
, trigger point of a thermal alarm, the red LED on the front panel will flash and there will be an alarm signal
sent out through the PMBus/
interface (refer to 3.19). Even so, the units still operate normally.
CANBus
◎
When the internal temperature is within a normal value, there will be a "LOW" signal (-0.1 -0.5V) sent out through T-ALARM on CN1; there will be a "HIGH"
signal (4.5 -5.5V) sent out through T-ALARM on CN1 when internal temperature exceeds a certain value. (referenced to GND-AUX).
◎
Maximum output current: 10mA.
◎
Built-in over voltage protection circuit for every single units.
OVP triggering points vary in different output models. Please refer to the specification sheet for detailed information.
◎
◎
Once OVP is triggered, leave the units off for 10 seconds before recycling AC again.
3.12
Fan-lock Protection & Alarm Signals
3.13 Remote Control
◎
Built-in fan-lock protection circuit, the output will shut off when the DC fans stop operating (fan-lock or broken wires). In the meantime, there will
be a “HIGH” signal sent out through T-ALARM, referenced to GND AUX. Please remove the unit from your system and send back to our local
-
distributor or MEAN WELL for repair.
Maximum output current 10mA.
◎
Whole rack system
ON/OFF
Single unit ON/OFF
Figure 3-3 Connection of Remote Control
Between CN1 ON/OFF
and +5V-AUX
SW Open
SW Short
Output
OFF
ON
3.11
DC OK signal
3.10
AC OK signal
◎
Built-in AC input voltage detection circuit.
When AC input voltage
rms, the output voltage can start working normally and there will be a “
” signal ( . - .5V) sent out
AC-OK n
≧
87V
HIGH
4 5 5
o
◎
through
CN1. (
GND-AUX).
referenced to
When AC input voltage
rms, The output voltage shuts off and the red LED on the fron panel will light up. In the mean time, there will be a ”
”
≦
75V
LOW
◎
signal (- . - .5V) sent out
AC-O
. (
-
).
0 1 0
K on CN1 referenced to GND AUX
through
Maximum output current10mA
.
◎
◎
.
Built-in DC output voltage detection circuit
◎
When DC output voltage is within a normal value, there is a “LOW” (-0. -0.5V) signal sent out
DC-OK
. (
-
).
1
on CN1 referenced to GND AUX
through
◎
-
When DC output voltage is out of normal range, there is a “HIGH” (4.5-5.5V) signal sent out
. (
-
).
DC OK on CN1 referenced to GND AUX
through
◎
Maximum output current 10mA.
◎
Built-in remote
control circuit, refer to Figure 3-3 for control methods of single unit or whole rack system.
ON/OFF
◎
Please be aware that “ON/OFF” and “+ V-AUX” n CN1 should be linked together to allow the units operate normally; If
, there will be no
5
o
kept open
output voltage
.
◎
Maximum input voltage 5.5V.
3.14
Remote Sense
◎
O
DRP 3200
nly for
-
.
◎
.
Built-in remote sense circuit that is able to compensate voltage drop up to 0.5V
When using this function, the sensing wires should either be twisted or shielded to prevent external noise interference (refer to Figure 3-4).
◎
Voltage drop across the output wires must be limited to less than 0.5V. Also wires with adequate current rating should be used between
◎
+V,-V and the
loads. Please firmly connect the output wires to prevent them from loosing, or the power supply may be out of order.
The +S and –S have to be connected to the +V(signal) and –V(signal), respectively, as shown in Figure 3-5, which is Local Sense, in order to get the
◎
correct output voltage if Remote Sense is not used. Otherwise, the output voltage will increase to a extremely high level which may trigger OVP.
+5V-AUX
+5V-AUX
ON/OFF A
CN1
CN1 ON/OFF A
ON/OFF B
ON/OFF B
ON/OFF C
ON/OFF D
ON/OFF D
ON/OFF C
DHP-1U System
DHP-1U System
3
3
7
7
11
15
11
15
21
21
