Definitions And Operation Notes - Zenith ZBTSH Series Instruction Manual

DEFINITIONS:
BP - Bypass/Isolation Switch
)
It is a manually operated device used in conjunction with an Automatic Transfer Switch (ATS) to
provide a means of directly connecting load conductors to a power source, and of disconnecting
the Automatic Transfer Switch.
The BP can also be used as a Manual Transfer Switch in the event of a power failure while the
ATS is in the TEST, ISOLATE, or RELEASE positions.
ATS - Automatic Transfer Switch
Is a self-acting equipment for transferring one or more load conductor connections from one power
source to another.
DS- Disconnect Switch
Inhibits operation of ATS Main Coil (CNE). In the "AUTO" position, the ATS operates normally.
In the "INHIBIT" position the main coil (CNE) cannot be energized, and automatic transfer in either
direction cannot take place.
MBH - Manual Bypass Handle
Actuates the Bypass Operator.
Center for Bypass Open.
Down for Normal Bypass.
~or
Emergency Bypass.
TS- Test Switch
Simulates Normal line failure when open.
OPERATION NOTES:
1. The ATS will not operate if:
a). Harness plugs are not connected.
b). DS is in the 'INHIBIT' position.
c). ATS is not in 'AUTO' or 'TEST' location.
d). ATS is in 'AUTO' location and BYPASS SWITCH is not open.
2. The MBH will not operate if:
a). ALH is not engaged in one of the following: AUTO- TEST- ISOLATE.
b). If source selected is opposite of the ATS position while in the AUTO location.
c). ATS is in 'TEST' or 'ISOLATE' location and source selected is not available.
3. The ALH (ATS Location Handle) will not operate if:
a). BP and ATS are not positioned to same source.
b). Power is not available.
c). Harness Plugs are not connected.
d). ATS has reached limit of travel to 'AUTO' or 'ISOLATE'.
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