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SLC4075 TouchScreen Gateway Installation & Operating Manual
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10. Field Wiring
Shielding
Shielded twisted pair wire is recommended for wire runs which are in close proximity to power wiring or other sources of
electromagnetic interference (EMI).
When using shielded wiring, the shield should only be terminated at one end to prevent ground loop currents. Preferably
terminate the shield at the source end's signal common. 2nd choice is to terminate the source end to earth ground. 3rd
choice is to leave both ends of the shield un-terminated. EMI may originate from conducted, induced, or capacitive
sources.
Grounding
The low voltage circuit common on the Selectronix Superstep SLC4000 controller is TB3, and TB6. It is isolated from the
line control voltage and relay connections.
Connecting the low voltage circuit common to earth ground is optional, however extreme care must be taken not to
introduce ground loops. Verify that all field wiring is in accordance with local electrical codes
Limit Control Wiring
The recommended wiring for a limit event is:
1.
Provide continuous power to the master SLC4000, as it coordinates communication between the TSGW and the PGW
(SLC4060).
2.
On all SLC4000 units, disconnect power to the RLYCOM terminal, TB109. This de-energizes all contactor control
power.
3.
On a limit condition which has been configured as a PGW fault, the TSGW automatically switches the
AUX/DDC switch to the AUX position and sets the DDC command to 0.
a.
On the master SLC4000 during a limit event, verify that the auxiliary command input is set to zero.
This ensures a re-start with no load when the limit is resolved.
i. This may be accomplished by disconnecting the control power to an electronic controller.
ii. An alternate method of providing for a zero command is to use an external relay to connect SLC4000
TB4, load limit excitation to TB5, load limit input, during the limit event.
b.
If there is no connections to the SLC4000 command inputs, verify that the input configuration switches are set
to anything other than ohmic.
c.
If the PGW Voltage Driver has been connected to the SLC4000 command input, the output is held at 0 during
the limit event, provided the limit has been configured as a PGW fault.
Selectronix, Inc.
26
(425) 788-2979
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