Generac Power Systems PowerManager 004975-2, Руководство пользователя

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The remote start signal may also be wired to one of the PM-PCs in
addition to the PM-SC. This can be done so that at least one gen-
erator will start and connect to the Bus to provide critical power in
the event that the PM-SC is unable to control the MPS.
If the remote start signal from the ATS(s) fails, placing the PM-SC
key switch in the MANUAL position will start the MPS as though a
remote start command was received. All the units will parallel, per-
missives be issued, etc. This is a new feature. Previously, placing
the PM-SC key switch in the MANUAL position had no function.
3.11.6 MANUAL BACKUP OPERATION
This mode of operation requires a trained operator to intervene in
the event of a system failure. The manual backup operation is avail-
able with PM-PC and PM-SC firmware version 2.2H or later. The
PM-PC touch screens must have screen firmware version 1.02 or
later. The manual backup operation consists of the normal MPS
operation with the added ability to manually request a generator to
synchronize and connect to the Bus. If any of the generators are
operating in a backup mode, the entire system changes to backup
mode. When the MPS is in a backup mode, the communications
are no longer adequate to provide dynamic power sharing between
the connected generators while maintaining target frequency and
voltage. All the generators attempt to take their share of the load.
This results in the frequency varying by up to 3% and the volt-
age varying by up to 10% depending on the system load. Since
the PM-SC does not have complete knowledge of the system in
backup mode, it will not control the load shed signals and will only
partially control the permissive signals. Therefore, the permissive
signals must be manually operated and the load shed manually
operated as needed.
In addition to having the correct versions of firmware, the version
of GenLink must be 2.8.0 or later to allow enabling of the manual
backup feature.
Procedure for Enabling Manual Backup Operation:
Using GenLink, connect to the PM-SC.
Open the “Configuration” pull down menu and select “Regulator
Settings” (Figure 3.10).
Figure 3.10 — Regular Settings
In the lower left corner of the “Regulator Settings Page” is a
section called “Backup Paralleling Options”. Enable the “Manual
Mode” setting (Figure 3.11).
Figure 3.11 — Enable Manual Mode
Close this window and drill down to each generator PM-PC and
repeat this operation on each PM-PC. If the PM-PC(s) and the
PM-SC are not set up the same, power will not be shared correctly
while operating in backup mode.
Procedure for Entering Manual Backup Mode:
The following procedure refers to generator numbers. The genera-
tor number is the ModBus address of that generator. Backup mode
priorities and delays are based on the generator numbers. Also,
the wiring is specified based on the generator number. Therefore,
the generators should be numbered sequentially via GenLink start-
ing at #1.
The MPS will normally have all PM-SC and PM-PC key switches in
the AUTO position. If the PM-SC or any PM-PC is no longer com-
municating with the MPS, an alarm will indicate on the PM-SC,
PM-PC, or both. This alerts the operator to the need for interven-
tion. If the utility power is lost at this time, the following procedure
will allow the operator to put the MPS online manually.
When the utility fails, generator #1 should start if the remote start
has been run to it and connect to the Bus when the generator is
ready for load. If it does not, then start this procedure with genera-
tor #1.
Go to each generator in the MPS that is not running and turn the
key switch to the OFF position.
After all the appropriate key switches are in the OFF position, each
of these generators needs to have their key switch placed in the
MANUAL position and the following touch screen procedure used
to connect them to the Bus. This can be done by switching all
these generators to MANUAL first then going back to connect each
generator to the Bus or go to each generator, switch it to MANUAL
and connect it to the Bus.
Using the generator touch screen main menu, select the Diagnostics
page (Figure 3.12).
Operation