IAI America PS-24 - Manual (Page 24)

20
10. Parallel Operation
Parallel operation is available under the following conditions.
Ÿ Parallel operation is allowed up to 5 units. Do not connect a different type power supply
unit from PS-24 Power Supply in parallel.
Ÿ 2 terminals for each of positive side and negative side as the output terminals are
provided. Use one terminal for the parallel connection, and the other for the connection to
the load.
Ÿ When performing a parallel operation, turn ON the power for all the connected PS-24
Power Supply units at the same time. If the duty on one unit is too high, the over current
detection circuit starts to work and may cause a failure in operation.
Ÿ Consider the connection of the power supplies to distribute the duty evenly to all the units
so that a high duty is not applied on a single unit. Output voltage may drop with the in-
rush current when the power is turned ON.
Ÿ Select a cable which has AWG18 (0.75sq) or more thickness for the load and transfer
cables and the same thickness for all the cables considering the current. And, layout as
short as possible.
Ÿ When connecting multiple units of power supply in parallel, the derating of output current
is approximately 90%. Perform a parallel connection with confirming the current capacity.
1 unit............. Rated 8.5A
2 units........... Rated 15.3A (8.5A
Ч 2 Ч 0.9)
3 units........... Rated 22.95A (8.5A
Ч 3 Ч 0.9)
Note : 1. When turning ON the power with no load, there is a case that a power supply
does not turn ON the RDY display and RDY output signal. The power supply will
operate in normal by connecting the load.
2. Series connection is not available.
Ÿ Make sure to separate the cables for the parallel connection of the power supply units
from those connected to the load. Also, twisting the cables will improve the noise
durability.
24V
24V
0V
0V
FG
AC(N)
AC100(L)
AC200(L)
24V
24V
0V
0V
FG
AC(N)
AC100(L)
AC200(L)
24V
N
Load
24V
N
Load
Parallel Connection