SBS AT10.1 SERIES, Инструкция по эксплуатации и обслуживанию

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APPENDIX F
93
OPERATING THE AT10.1 WITH FORCED LOAD SHARING
Restore external power connections to both AT10.1s, and restart according to the normal
procedure in the AT10.1 Operating and Service Instructions. After the AT10.1s restart, the Primary
charger attempts to establish communication with the Secondary. If communication is successful,
the AT10.1s behave as follows:
•
The Primary charger displays the message
LS-P
(Load Share, Primary) on the front panel meter,
alternating with the normal display of output voltage and current.
•
The Secondary charger displays the message
LS-S
(Load Share, Secondary) on the front panel
meter, alternating with the normal display of output voltage and current.
•
The Primary charger transfers all its set points (float, equalize, alarms, etc.) to the Secondary
charger. The Primary charger also controls all set points for both AT10s. While in Forced Load
Sharing mode, you may adjust any set points (of the charger pair) at the front panel of the
Primary. The front panel of the Secondary charger won’t allow any settings to be changed.
•
If one charger loses ac power (or is turned off), the remaining charger returns to independent
operation, whether it was originally the Primary or Secondary.
•
If an alarm occurs, both AT10s revert to independent operation for the duration of the alarm.
•
In the event of a fault in the interconnection, or any other problem with communication, the
AT10.1s return to independent operation, and the front panel on each charger displays the
message
E 14 , indicating the fault.
•
There is a delay (up to 4 seconds) for the two (2) AT10.1s to establish forced load sharing
communication. If communication is broken (or power is lost for one charger), there is a 2-4
second delay for the other charger to resume independent operation.
•
If you need to interchange the Primary and Secondary chargers, simply reverse the
interconnection cable.
•
The presence of the interconnection cable (with proper orientation) forces the two AT10.1s into
load sharing. Controlling load sharing from the front panel is neither necessary nor possible.
•
..
!
WARNING ..
Never separate the AT10.1 from the dc bus while in forced load sharing mode.
WHEN TEMPERATURE COMPENSATION IS INSTALLED
The AT Series forced load sharing feature is compatible with the AT Series external
temperature compensation accessory. Both AT10.1s must have a temperature probe installed, and
the probes should be located as close as possible to each other. When AT10.1s are load sharing, the
primary charger will determine the temperature-compensated voltage, and adjust the output
accordingly. The voltage displayed by the master and secondary may be different, if either
temperature probe is defective or not installed. A slight difference in the displayed voltages may
also occur if the two (2) probes are not located in close proximity of each other. See user
Application Note (
JD5003-00
) for further details regarding temperature compensation.
TROUBLE SHOOTING
If the AT Series Forced Load Sharing option is installed, but the output currents of the
AT10.1s are unequal, refer to the following table.
PROBABLE
CAUSE
RECOMMENDED ACTION
1. Connection cable
missing or installed
incorrectly.
2. Incorrect connections
to ac power sources.
3. Defective or improper
Main Control Board (A1)
1. Ensure that the interconnection signal cable assembly is properly
installed, and that the connector for the
Secondary charger has the
jumper as described at the top of page 3.
2. Ensure that both AT10.1s are connected to the same ac supply and
that source phase rotation is the same for both chargers.
3. Replace the Main Control PC Board (A1) in one charger at a time,
noting system requirements, to restore correct load sharing operation.