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3
Connecting the Load
This chapter describes the consideration to be given to the load, explains how to connect the
load wires, and explains how to connect to the output terminals.
Load Considerations
Note that the output will become unstable if the following types of loads are connected.
Load with peaks and pulse-shaped current
The PAT-TM/TMX series indicates only mean values. Even when the indicated value is less than the
preset current value, the peak values may actually exceed the preset current value. If this happens,
the PAT-TM/TMX series is instantaneously put into constant-current operation mode, and the output
voltage drops accordingly.
For these types of loads, you must increase the preset current value or increase the current capacity.
Fig3-1
Load that generates reverse current to the power supply
The PAT-TM/TMX series cannot absorb reverse current from the load. Therefore, if a
regenerative load (such as an inverter, converter, or transformer) is connected, the output
voltage increases and becomes unstable.
For these types of loads, connect a resistor R
current. However, the amount of current to the load decreases by max. reverse current I
Equivalent circuit of
the PAT-TM/TMX series
• Use a resistor with sufficient rated power for resistor R
CAUTION
• If a resistor with insufficient rated power for the circuit is used, resistor R
PAT-TM/TMX
Preset constant current value
Ammeter reading
(average value)
Load current with peaks
I
−
O
+
E
R
O
D
Regenerative
load
Remedy for regenerative load
Fig3-3
Preset constant current value
Ammeter reading
(average value)
Fig3-2
Pulse-shaped load current
as shown in Fig3-3 to bypass the reverse
D
+I
O
R
[Ω] ≤
D
0
I
rp
R
: Reverse current
D
Reverse current
bypass dummy load
-I
O
E
: Output voltage
O
I
: Max. reverse current
rp
.
D
may burn out.
D
.
rp
E
[V]
O
I
[A]
rp
15
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