Advertisement
Output Ripple:
It is possible that a small ripple and a small output noise is
noticed and may even audio noise characteristic occur, do not
represent a malfunction to the supply.
Protection Against Short-Circuit:
The protection circuit is the oscillating type of automatic
recovery, ie, when the protection operates the output
de-energizes itself, and the supply back to operate
automatically once the overload is removed.
The short protection circuit acts as a power limiter, where the
output voltage is reduced due to the overload current, as
shown in the chart below:
V
24
21
20
16
12
8
4
A
Pic. 19
0
2
4
6
8
10
11
10,5
Restoring After Overload:
If the supply is not supplying energy without , overload, must
proceed:
Remove the overload or decrease font loads.
Disconnect and reconnect the AC power supply.
• If power not restored withdraw all charges deenergizing the
24 Vdc output and reconnect the AC input.
Output Voltage Adjustment:
If the supply is far from its loading center , the output voltage
can be raised slightly by correcting the excessive voltage drop
that may exist at the end of the line. To do so you must check
the maximum allowable voltage for all devices connected to
the line.
The tension adjustment is made via a one pot back on the front
of the fountain below the LED status. The potentiometer allows
you to adjust the output voltage of 22V to 28V. Turn the trimpot
counter-clockwise to decrease tension and counterclockwise
to increase it.
Fig. 18
Minimum Load:
So that the supply function properly, it is needed a minimum
load of 1A, otherwise there will be a little instability in the supply
due to narrowing of the PWM pulse, which DOES NOT cause
problems, so it is possible that the supply function without
charge, without risk to the user, but its output voltage
regulation and can not be within the values established by
having the supply indicates a nonexistent failure.
Minimum Load Resistor:
In the figure below minimum load resistor is installed in parallel
with the load so that the total supply current is not less than 1A.
Pic. 21
Resistor Calculation:
The load resistor should be calculated with the addition of
current drawn by the load current for minimum, as:
24
24
24
R
80
1
Ic
arg
a
1 0 7
,
0 3
,
P
24 1
. (
Ic
arg )
a
24 1 0 7
. (
, )
24 0 3
For I load < 1A.
:
Redundance
The supply is redundant type. Two or more supplies may be
connected in parallel. Thus, even if a defect in one supply, the
power supply will not be interrupted.
Vca
Fonte 1
F 1
Fonte 2
F 2
Fig. 20
Alarm:
• The supply has an alarm relay, which is especially suitable
for applications where dual power supplies, to indicate that
one supply is not operating. The contact used to indicate
remotely that one supply stops working.
Conditions that make the alarm contact open:
Lack of AC current at the input.
• defect in the internal circuitry of the energy transformation.
Note: when the supply is in stand-by contact remains closed.
Load Division:
In applications with redundant power supplies, we recommend
that supplies divide the load current, so that if one fails the
other only increase the current supplied without prejudice to
the load.
The division need not be equally distributed by supplies
recommend only adjust the output voltage so that the green
LED output lights up, indicating that the supply is supplying
current.
For the current division is accurate, it is necessary to very
precisely adjust the output voltage to the same voltage supply,
but still can occur due to differences in wiring impedance.
Adjustment Procedure for Redundance:
• Taking as an example the design 22, disconnect the
positive output of each source.
Place a voltmeter accurate to 2 decimal places in the output of
the power and turn the potentiometer clockwise to increase
pressure or counterclockwise to decrease.
• Look adjust the two supplies with the same output voltage.
Adjustment Procedure for Isolated Supplies:
In the case of single supplies acting on the pot by raising or
lowering the output voltage by monitoring the voltage that
x
,
7 2
,
W
effectively reaches the load, compensating for voltage losses
in the cabling.
Incorrect Installation:
Attention!
The improper installation or use can influence the
supply functioning, or even permanently damage the unit.
Safety Warnings:
Before working with the supply carefully read the instructions:
Before placing the supply in operation must be ensured:
• The connection of supply and output are consistent with the
connection diagram.
+
• Wires are securely attached to the terminals.
Vcc
• That the cables are connected to the output load with
CARGA
correct polarity.
-
• That the load does not exceed 10A.
• You have enough for the perfect functioning of the cooling
supply.
• Note that the wires have proper gauge for the current
transmitted.
+
Attention!
Never open the power while in operation, because the unit
contains components that store energy. Improper handling of
-
these can cause serious injury to the operator.
Caution!
Pic. 22
Even after de-energized, the supply accumulates electricity.
Therefore we do not recommend open supply because very
strong electric shocks to risk death can occur in the handling.
KFT-2410R Care:
Be careful when connecting the terminals as contact wires with
metal housing may cause electric shock-threatening.
Mechanical Dimensions:
Fig. 23
Pic. 24
EA3000830- Rev. Bi - 09/15
Advertisement
