Saturn South SS9005, Руководство пользователя

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6 Switching
Switching variants of the SS9005 Mini Three Phase Meter can be used to switch loads of arbitrary
size indirectly using an inbuilt 5A 240VAC latching relay. If your device is marked with an R on its
variant label (e.g. “120A/
R ”), the two terminals marked 'SWITCH' are connected internally to an
isolated relay.
The internal relay would typically be used to control a third party external contactor or to signal a
control system. Because the relay contacts are isolated, the SS9005 Mini Three Phase Meter can be
connected directly to a digital IO on a control device such as a PLC.
The example below shows a SS9005 Mini Three Phase Meter being used to control an external
contactor with a 240V coil by switching the active input to the contactor’s control coil.
Figure 3: Mini Three Phase Meter connected to an external single-phase contactor
The internal relay in the SS9005 Mini Three Phase Meter is rated for over 10000 switching
operations of a 5A load at unity power factor. The relay is limited to one switch state transition per
second (e.g. the device cannot be switched on and off at a rate faster than 0.5Hz).
A value of 1 in the ‘Switch State’ attribute of the On/Off Cluster indicates that the relay is closed
(connected), and a value of 0 indicates that the relay is open (disconnected).