THOMSON TSC 7320 - AC Control Power Input Requirements; Auxiliary DC Control Power Input; Programmable Inputs Overview; Programmable Outputs Overview

TSC 7320 Transfer Switch Controller
PM180 REV 0 23/02/10 Thomson Power Systems
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2.6. AC CONTROL POWER INPUT
The TSC 7320 requires 24VDC control power input voltage. Independent AC control power is
required from both utility and generator supplies via potential transformers. The potential
transformers then supply voltage to 24VDC power supplies. The TSC 7320 typically requires
approximately 12VA AC power for internal control circuits but may draw up to 30VA dependent
upon external loads connected. The maximum external load is limited by output contact ratings
(i.e. 10A resistive, 120/250VAC). Total AC control power requirements for each supply must be
determined by adding both internal and external load requirements.
2.7. AUXILIARY DC CONTROL POWER INPUT
The TSC 7320 can be additionally supplied with 24VDC auxiliary control power input voltage for
applications requiring continuously energized control and display features. The maximum input
power draw is 25W. The 24VDC power must be from a regulated/filtered DC supply with
maximum +-10% voltage range.
2.8. PROGRAMMABLE INPUTS
The TSC 7320 provides Qty 16 Programmable Inputs. Each input is activated by external contact
closure to common (i.e. DC Negative ground). Each programmable input can be independently
programmed to different functions. Refer to SECTION 3.2 for more information.
2.9. PROGRAMMABLE OUTPUTS
The TSC 7320 is provided from the factory with 8 programmable digital outputs (24VDC) and 2
programmable dry contact outputs. See SECTION 3.3 for more information
Interposing relays are required between the TSC 7320 outputs and the end device if loads
exceed the output current rating.
2.10. EXTERNAL ATS CONTROL WIRING
As a minimum, all external control wiring to/from the ATS must conform to the local regulatory
authority having jurisdiction on electrical installations. Specific wire sizes listed below are for
typical circuits of distances up to 500ft (150m)
1
, are as follows:
Utility or Generator Voltage Sensing #14 AWG (2.5mm
2
)
Transfer output signals #14 AWG (2.5mm
2
)
Remote Start Contact for Engine Controls #14 AWG (2.5mm
2
)
NOTE: For long control wire runs or noisy electrical environments the control wires
should be twisted & shielded with a suitable drain wire. The shielded cable drain wire
must be grounded at one end only. The drain wire grounding location may vary as micro-
processor controllers generally exist at both ends (engine generator set & transfer