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Emerson 7ATB - page 1
381333–132 F 50 Hanover R oad, Florha m P ark, New J ersey 07932–1591 USA For sales or service call 1 800 800–2726 (A SCO) www.ascopower .com AS CO POWE R TE CHN OLOGI ES CA NA DA PO Box 1238, 17 A irport Road, Bra ntford, O ntario, Canad a N3T 5T3 Operator’s Manual 7000 Seri es 7A T B Automatic T ransfer & Bypass–Isolation S witches ...
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Emerson 7ATB - page 2
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Emerson 7ATB - page 3
Ca talo g Number I dentif icatio n T y pical 7000 Ser ies A TB catal og no. for ove rla pping neutra l, 3 pol e, 4000 am p., 480 V , in T y pe 1 encl osure: G7A T B C 3 4000 N 5 C Phase Poles Neutral A –s o l i d Amperes Vo l t a g e Co ntrolle r Enclos ure B – swi tching 5X –i f accessor ies order ed 5 –s t a n d a r d G –t y p e4 C –t ...
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Emerson 7ATB - page 4
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Emerson 7ATB - page 5
1 --- 1 SECT ION 1 INST ALLA TION The ASCO 7000 Series A uto matic T ra nsfer & Bypass–Isolati on Switch (A T B) consists of an upper bypass–isolati on switch, a lower transfer switch, a monitoring and transfer control ler, and door–mounted controls. The A T B is fa ctory wired and te sted. Installation requi res removal of the shi pping ...
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Emerson 7ATB - page 6
INST ALLA TION (continued) 1 --- 2 De–energ ize the conductors bef ore ma king any line or a uxiliary circuitry connections. Be sure that Normal a nd E mergency l ine connections are in prop er phase rota tion. Place eng ine gen - erator sta rti ng co ntrol in the OFF po siti on. M ake sure engine genera tor is not i n opera ti on. T esting Po we ...
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Emerson 7ATB - page 7
INST ALLATION ( continued) 1 --- 3 obse rve these li ghts Tr a n s f e r S w i t c h Connected To Normal Tr a n s f e r S w i t c h Conne cted To Emergency Normal Source Accepte d Emergency Source Accepte d Tr a n s f e r Control Retrans f er Dela y Bypas s Tr a n s f e r Te s t HOLD FOR 15 SECO NDS RED RED GREEN GREEN ( ) Figure 1 - 2. Standard co ...
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Emerson 7ATB - page 8
INST ALLA TION (continued) 1 --- 4 obse rve these li ghts Tr a n s f e r S w i t c h Connected To Normal Tr a n s f e r S w i t c h Conne cted To Emergency Normal Source Accepte d Emergency Source Accepte d Tr a n s f e r Control Retrans f er Dela y Bypas s Tr a n s f e r Te s t HOLD FOR 15 SECO NDS RED RED GREEN GREEN ( ) oper ate this s wit ch Fi ...
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Emerson 7ATB - page 9
SECT ION 2 TEST ING & SERVICE 2 --- 1 TRA NSF ER TES T T est the A utomati c T ransfer Swit ch portion of the 7000 Series A T B at least once a month. This procedure chec ks the elec trical operation of the T ransfer S witc h and C ontroll er. Put the engine–generat or starti ng con- trol (at the eng i ne–g enerator set) in autom atic mode. ...
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Emerson 7ATB - page 10
TEST ING & SERVICE (continued) 2 --- 2 TROUBL E-SHOOTING Note any opti onal acc essories tha t may be furnished on the A TB and rev iew their oper ation. R efer to any separat e drawings and/or instructions t hat may be pack ed with the A TB. Haz ardou s voltage capable of c ausi ng shock, burns, or death is u sed in th is swit ch. Do not tou c ...
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Emerson 7ATB - page 11
SECTION 3 B YP AS SING & ISOLAT ING 3 --- 1 BY PA S S I N G T H E AT S * This pr oc edur e expl ains how to Bypas s the clo sed autom atic transfer sw i tc h contac ts. Bypassing is requir ed before the A TS can b e tested or isol ated. The Bypass Handle must be in the OPEN positi on (green indic ator) and the Isolation Handl e mu st be in th e ...
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Emerson 7ATB - page 12
B YP AS SING & ISOLA TING (continued) 3 --- 2 ISOLATING THE A TS Isolating is required before any service work can be perform ed on the automatic tr ansfer sw i tc h (A TS). R efer to Figures 3–4, 3–5, 3–6, and 3–7. 1. Bypass t he closed autom atic transfer switc h contac ts. See BY PA S S I N G on page 3–1. Al ign p os ition ind icat ...
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Emerson 7ATB - page 13
B YP AS SING & ISOLA TING (continued) 3 --- 3 left s up port le g right support l eg lockin g pin with c lev is pi n lockin g pin with c lev is pi n adjust length to touch fl oo r adjust length to touch fl oo r Draw out p roced ure grasp two handles 1. B ypa ss an d Is olate t he ATS, th en ope n both low er door s. 2. Pul l out the rail suppor ...
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Emerson 7ATB - page 14
B YP AS SING & ISOLA TING (continued) 3 --- 4 RETURN TO SERVI CE This proc edure expl ains how to retur n the autom atic tr ansf er s wit ch (A T S) t o ser vice a ft er i nsp ecti on a nd maintena nce. Observe the By pa ss Switch P ositi on indicat or and lights). R efer to Figures 3–7a, 3–7b, 3–8, 3–9, and 3–10. 1. Slide the transf ...
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Emerson 7ATB - page 15
B YP AS SING & ISOLA TING (continued) 3 --- 5 RETURN TO SERVI CE continued* This proc edure expl ains how to retur n the Bypass Sw itch H andle to the OPE N position . The Bypass Han dle must be i n the CL OSED pos it io n (ye llow indic ator on NORMAL or EM ERGENCY )a n d t h e Isol ation Hand le m ust be in the TEST position (window). If the ...
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Emerson 7ATB - page 16
INDEX Printed in U .S.A . E ASCO Power T echn olo gies, L .P . 2009 A auxil iary c irc uits, 1–2 B bus connections, 1–2 bypassing t he A TS, 3–1 C cat alog n umber, ins ide co ver cleaning, 2–1 connections power, 1–2 cont rolle r disconnecting, 2–1 see Controller Us er’s Guide D drawout, transfe r sw i tch, 3–2, 3–3 E elec trical ...
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