Trouble Shooting - HindlePower AT30 SERIES Operating And Service Instructions

OPERATING THE AT30 WITH FORCED LOAD SHARING
Restore external power connections to both AT30s, and restart according to the normal
procedure in the AT30 Operating and Service Instructions. After the AT30s restart, the Primary
charger attempts to establish communication with the Secondary. If communication is successful,
the AT30s 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 controls all voltage settings for both AT30s. You may adjust any voltage
(float, equalize, alarm settings, etc.) at the front panel of the Primary charger. The front panel of
the Secondary charger will not allow any settings to be changed.
•
If one AT30 loses ac power (or is turned off), the remaining charger returns to independent
operation, whether it was originally the Primary or Secondary. For this reason, it is important to
set up both AT30s initially for the same operating voltages. If an alarm condition occurs, both
AT30s 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
AT30s return to independent operation, and the front panel on each charger displays the message
E 14, indicating the fault.
•
There is a delay of up to four (4) seconds for the two (2) AT30s to establish forced load sharing
communication. If communication is broken (or power is lost for one charger), there is up to a
four (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 (and a proper interconnection) forces the two (2)
AT30s into load sharing. Controlling load sharing from the front panel is neither necessary nor
possible.
•
..! WARNING..
WHEN TEMPERATURE COMPENSATION IS INSTALLED
The AT Series forced load sharing feature is compatible with the AT Series external
temperature compensation accessory. Both AT30s must have a temperature probe installed, and the
probes should be located as close as possible to each other. When AT30s 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 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
AT30s are unequal, refer to the following table.
PROBABLE
CAUSE
1. Connection cable
missing or installed
incorrectly.
2. Incorrect connections
to ac power sources.
3. Defective or improper
Main Control Board (A1)
Never separate the AT30 from the dc bus while in forced load sharing mode.
RECOMMENDED ACTION
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 AT30s 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.
APPENDIX F
93