Epilson STSTM
Front Display Panel | Comprised of a 4.7” x 3.6” LCD with associated “soft” keys for monitoring status, |
| alarms, changing certain settings and performing certain operations; an LED “mimic” |
| diagram display for indicating switch status and power flow; and manual control |
| pushbuttons for manual transfer functions. |
| Hard Keys | Manual, dedicated keys (pushbuttons) that have a single function. |
| Input Power | The Epsilon STS™ is normally connected to two separate, independent sources, |
| Source S1 and Source S2. Power from each source can be provided by the |
| electrical utility company, a generator or a UPS. |
| SCR Switch | A set of three pairs of SCR's that function as a |
| source. |
| Soft Keys | Programmable keys (pushbuttons) associated with the LCD, that can be used for |
| several different functions depending on the displayed screen |
Static Transfer Switch (STS) All components within the Epsilon STS™ cabinet that function as a system to transfer the critical load between two independent sources of power using solid- state SCR switches or bypass to either source using manual bypass switches
| PMM2 | Plus | A configuration with the Epsilon STS™ and PMM2 cabinet. The input of the PMM2 |
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| cabinet is supplied by the output of the STS. Refer to the PMM2 manual |
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| 00 for more details. |
PMM2 | Ultra | A configuration with the Epsilon STS™ and PMM2 cabinet. PMM2 isolation trans- |
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| formers feed each STS input source upstream of the STS. The transformer |
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| secondary output of the |
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| the STS connects to the output busbars of the |
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| feeding panelboards or main frame circuit beakers. Refer to the PMM2 manual 86- |
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Figure
LCD GRAPHIC 
DISPLAY
LED STATUS &
MIMIC DIAGRAM
NORMAL OPERATION
A 2A B 1A C 3A
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| 0 KW | 1 KVA | ! | ||||||||||||||
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| Preferred |
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UPS 1 |
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| UPS 2 | ||||||||
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| Synchro |
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60.0 HZ |
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| 60.0 HZ | |||||||||
= 0º |
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RETURN TO PREFERRED SOURCE
LIMITS
HELP KEY
"SOFT" FUNCTION KEYS
MAIN MENU KEY
ALARM SILENCE KEY
LAMP TEST KEY
MANUAL OPERATIONS KEY
MANUAL CONTROL KEYED SWITCH
1 — 6 | Introduction |