Output Voltage
This power supply is able to be used in a parallel operation, and the output voltage
fluctuates within the range of 24V±10% even in a normal operation.
The voltage is set to around 25.5V at no duty. This voltage fluctuation does not
influence the operation of IAI 24V controller at all.
Output Current
It should be available to have the peak current output only when it satisfies the
following conditions.
●
The duty cycle of the peak current should be 30%.
D
≤
0.3
●
The communication time of the peak current should be 10 seconds or less.
ｔ
≤
10 [sec]
●
The average current should be
Ｉ
0
or less which is the continuous rated current
determined by the output derating.
Ｉ
p
= Peak Current
Ｉ
m
= Minimum Current
D
= Duty Cycle, t/T
T
= Peak Current Pulse Band
T
=
Frequency
Ｉ
0
= Rated Current Determined in Output
Derating Graph
Protective Functions
(1) Over Current Protection Circuit
The voltage suddenly drops when the current more than the peak maximum current output
is output (includes short circuit). Power output automatically recovers when the over
current condition is cancelled.
There is a case that the over current protection circuit works due to the in-rush current
caused by turning on multiple controllers at the same time.
Described above is concerned as the cause of the phenomenon of sudden voltage drop
occurring when turning on each actuator controller, emergency stop being cancelled, and
so on.
(What happens as the influence of the voltage drop is that it takes comparatively long time
at the start-up of the controllers or canceling the emergency stop.)
In the case this is occurred, it is necessary to boost the controllers one by one, or add
another power supply.
(2) Over Voltage Protection Circuit
The over voltage protection circuit works when the output voltage rises abnormally high.
If the voltage continues to rise, it shuts down the output. To recover, shut down the input
power first, leave it for approximately 2 minutes, and then input the power again.
When the over voltage protection works, internal devices may break. If output does not
work properly even though trying to turn on the power several times, it may require a
repair.
(3) Over Temperature Protection Circuit
The over temperature protection circuit detects an abnormal rise of the ambient
temperature and internal temperature, and shuts down the output.
To recover, shut down the input power first, leave it for a while till it cools down, and then
input the power again. If the over temperature protection works often, lower the ambient
temperature and the duty ratio.
(4) Over Load Detection
The threshold for the current approximately 8.7A should be as shown below with and
without fan.
For PSA-24 : Approx. 9.8A
For PSA-24L : Approx. 14.2A
(5) Input Low Voltage Protective Function
The input low voltage protection circuit starts working when the input voltage gets lower
than the specified range.
The output voltage should be shut off when the input voltage gets lower than 82V AC. The
operation comes back normal if the input voltage gets more than 82V AC.
(6) Fan Rotation Drop Function
A warning and error should be notified when the rotation of the fan gets low in PSA-24L.
Warning : Notification by warning bit with LED lamp flashing and communication when
70% or lower continues for 15 seconds or more
Error
: Notification by error bit with LED lamp flashing and communication when 50%
or lower continues for 15 seconds or more
also, when an error is detected due to drop of the fan rotation, as there is a concern of
remarkable drop of the production life because of abnormal overheat, the threshold for
overload detection inside should be compulsorily switched to the setting for PSA-24
(natural cooling), and continuous operation at 330W should become unavailable. It should
be recovered after shutting down the power, replace the fan and reboot the AC power.
Caution: Use of the product in a way that is not stated in the first step guide or the
instruction manual should lose the protection performance which the product
possesses.
Simple Troubleshooting
Contents Treatment
Voltage does not output
• Is the connected input voltage within the specification?
• Any short circuit or grounding fault on the output circuit?
• Time delay too short after over voltage or over temp
protection activated.
• Did you turn on the power supply units at the same time for
parallel operation?
• Did you check that the ambient temperature is not high?
• Is the load too big?
Output voltage is low.
• Is the load too big?
Manual No.: ME0380-2A
