5-2
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2308-900-01 Rev. A / July 2008
Section 5: Relay Control
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Overview
Model 2308 can be used to control up to four external relays. The control circuit is made up of four
peripheral drivers: A +5VDC source (250 mADC maximum), a coil diode suppression connection,
and a chassis ground return. The drive for the relay may be provided by the su5VDC
source or an external DC voltage source.
Figure 5-1
shows the simplified power supply control circuit and a typical configuration to control
an external relay driven by an external power source. As shown in the illustration, voltage applied
to the power supply must not exceed 24VDC and current for the relay circuit must not exceed
100mADC per channel.
Figure 5-2
shows the simplified power supply control circuit and a typical configuration to control
an external relay driven by the internal power source. If the su5VDC source is used to
drive the external relay, the relay circuit must not exceed 250mADC total (100 mADC per channel).
Note that the coil protection diodes are built in to the power supply driver (the user is not required
to add external protection diodes to protect the relay coils).
CAUTION
To prevent damage to the power supply that is not covered by the warranty,
always make sure to:
Connect suppression diodes (pin 7) to the appropriate voltage source (the
appropriate voltage source will either be an external power source or pin 8 if
using the internal source).
Never exceed the voltage and current limits of the power supply’s relay control
port:
External Source: 24VDC, 100 mA per channel
Internal source:
1. 5 VDC, 250 mA maximum total current from all channels combined.
2. 100 mA per channel maximum (not to exceed the 250 mA maximum total
current).
Connect and disconnect relay drive circuits with the power supply power OFF.
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