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M90B
Adds pre-wiring for Enervista Viewpoint
Monitoring of M90. Accessory and ATS Status
using Ethernet TCP/IP Communications
M91
EPM 6000 Digital Power Monitor with Modbus port
M91A
Adds pre-wiring for Enervista Viewpoint
Monitoring of M91. Accessory and ATS Status
using Modbus RS485 Serial Communications
M91B
Adds pre-wiring for Enervista Viewpoint Monitoring of M91.
Accessory & ATS Status using Ethernet TCP/IP Communications
P1
Time Delay Source 2 Start. Adjustable 0-10 seconds. Standard
P2
Time Delay S2 Start. Adjustable 1 to 300 seconds.
Q2
Remote Peak Shave or Area Protection Circuit. Energize Q2 to
simulate Source 1 Line failure causing the Generator to start
and transfer the load to Source 2. Should Emergency fail during
this operation, Transfer Switch will retransfer back to Source 1.
Q3
Remote inhibit transfer to Source 2 circuit.
Energize Q3 input to allow transfer to Source 2.
To enable Q3 option, engage Q3 jumper.
Q7
Inhibit transfer to Source 1 circuit. Energize Q7
input to prevent transfer to Source 1.
R1-3
Source 1 Over Voltage sensing for three phase systems. Source
1 Over Voltage "Fail" Factory Default: 110% This adjustment
determines the maximum acceptable over voltage. Adjust via
the SET menu. Range is 105% to 110% in 1% increments (see
the Generator to start. Source 1 Over Voltage "Restore" Factory
Default: 105% This adjustment determines the minimum
acceptable over Voltage threshold at which the Transfer Switch
is allowed to automatically transfer to Source 1. Adjust via SET
menu. Range is 103% to 108% in 1% increments. "Restore"
J2E/J2N
Under/Over Frequency sensing on S1 and S2
R8
3-phase OVer voltage sensing on S2
R15
Load Shed
Should Source 2 become overloaded, a signal
can be given to switch to the dead Source 1 or
Mid position, on Delayed Transition ATS
Zenith Automatic Transfer Switch |
new.abb.com/low-voltage
R16
Phase Rotation Sensing
Factory Default is on. This feature prevents Line Source to
Line Source transfers from occurring between dissimilar
phase sequences. This condition is primarily caused by an
installation error. Connections from Source 1 and Source
inconsistent phase rotation between the sources. WARNING:
R26
Interruptable Power Rate Provisions. Allow transfer
out of Source 1 position to Source 2 or dead Source
2. Alarm and Pre-Signal circuit included.
R50 (Not available on delayed transition ATS)
In Phase Monitor this feature restricts Live to Live Source
Transfers to occur unless both Sources are within 7
electrical degrees or less of each other. (live Source to
live Source transfers usually occur during transfer back
to Source 1 or during Testing). R50 does not change the
operation of the Automatic Transfer Switch in a power
failure mode. After all timer functions have elapsed, the
CHECKING FOR SOURCE SYNCHRONISM will be displayed
as well as the direction of transfer (S1-S2 for example
denotes transfer from Source 1 to Source2). When
synchronism is accomplished, transfer will take place.
Notes:
- If S2 Frequency is less than S1 Frequency, display
will show a series of (- - - - -.....) symbols.
- If S2 Frequency is greater than S1 Frequency, display
will show a series of (+++++.....) symbols.
- Each (-) or (+) symbol represents 10 electrical degrees out of phase.
A maximum of 18 symbols (180 electrical degrees) can be monitored.
- The number of (-) or (+) symbols decrease as the two sources approach
synchronism and increase as the two sources drift out of synchronism.
- If S1 and S2 Frequencies are identical, the display will show a series of alternating
symbols (+- +- +- +- ...) which also indicate the approximate out of phase degrees
In the event that the Sources do not come within 7
electrical degrees of each other within 60 seconds, the
unit will display the message: SYNCH CHECKING and
will allow the user to BYPASS. If the BYPASS button
is pressed, the unit will display the message:
WARNING MAY CAUSE DAMAGE TO THE LOAD. Pressing
XFR will actually bypass the R50. Since R50 is a passive
device, the length of time it takes to reach Synchronism is
Sources. Source 1 is usually a Utility and the frequency
is not within the control of the consumer. Source 2
in order for the transfer to happen a timely fashion.
Note: For optimum performance, Source 2 Generator should be
adjusted a Maximum of 2 Hertz above or below the Utility frequency,
minimum of 0.1 Hertz. (58 to 59.9) or (60.1 to 62) Hertz. Adjustment
of Generator to 60Hertz could cause lengthy transfer delay.
R50 Feature can be turned ON or OFF via CFG
33
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