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3-10. Peak Output Current
For ZWD225PAF series, the peak output current should satisfy
the conditions below:
1)Should not exceed the rated peak current in the specification.
(eg. 14/18A respectively for 100VAC/200VAC)
2)The relation between peak output current with average output
current is defined as below.
Ip = Peak output current
Im = Minimum output current
t
D = Duty cycle,
/T
t
= Peak output current operating time
T = Period
Io = Maximum allowable average output current of specifica-
tions (Io should be average load after derating at various
mounting and ambient temperature)
3)For peak output current (Ip ≤ 14A) at 100VAC & 200VAC,
the duty cycle of the peak output current is ≤ 35% and oper-
ating time of the peak output current is less than 10 seconds.
For peak output current (Ip ≤ 18A) at 200VAC only, the duty
cycle of the peak output current is ≤ 20% and operating time
of the peak output current is less than 5 seconds. Maximum
ambient has to be reduced by 10°C if 35% duty operation is
required.
Vin (VAC)
Ip (max)
85 ~ 132
14A
170 ~ 265
14A
170 ~ 265
18A
(ave)
t(sec)
Duty(max)
35%
10sec
35%
10sec
20%
5sec
4) Formula:
ZWD225PAF: Io(ave) = Ip x D + Im x (1-D) ≤ Io spec.
Example : For ZWD225PAF-0524 at Ta =60°C,Mounting A,
Max Io(ave) =4.5A (after 50% Derating)
Io(ave) = Ip x D + Im x (1-D) ≤ Io spec.
(A)100VAC : In case of Im =0, Ip =14A,
D<32%
(B)200VAC : In case of Im =2A, Ip =18A,
D<15%
3-11. Remote ON/OFF Control
Remote ON/OFF control (CN3) function is available. Using
this function allows the user to turn the 24V output on and off
without having to turn the AC input on and off.
It is controlled by short or open between +R & -R of CN3. CN3
is provided in the secondary circuit for ON/OFF control by
means of a switch or other device.
[CN3] The control mode is shown below.
+R & -R Terminal condition Output condition of V2
Short < 0.5V
Open > 4.5V
3-12. Isolation Test
Isolation resistance between output and PE (Chassis) shall be
more than 100MW at 500VDC. For safety operation, voltage
setting of DC isolation tester must be done before the test.
Ensure that it is fully discharged after the test.
Output – PE ( Chassis )
500VDC 100MW or more
AC(L)
AC(N)
Isolation
Tester
PE
FG
- 7 -
TDK-Lambda
ZWD225PAF Series
INSTRUCTION MANUAL
(refer to derating curve)
ON
OFF
+V2
G2
+V1
G1
+R
-R
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