SENS MicroGenius S2/S4 Technical Manual
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J1939 INACTIVE relay contacts change to Fail state after delay when alarm is assigned to relay
contacts.
8.4.13.
Modbus Inactive
Indicates the charger cannot access the Modbus network and is not receiving messages when
configured to use Modbus communications. Alarm/communications circuit board MODBUS
INACTIVE relay contacts change to Fail state after delay when alarm is assigned to relay contacts.
8.4.14.
SENSbus Inactive
Indicates the charger cannot communicate using SENSbus when load sharing and/or remote
accessories are connected. Alarm/communications circuit board SENSBUS INACTIVE relay contacts
change to Fail state after delay when alarm is assigned to relay contacts.
8.4.15.
Thermal Fold Back
Indicates charger output is reduced to protect the charger from over-heating damage. The
charger will not be able to produce full output until the ambient temperature is lowered.
Alarm/communications circuit board THERMAL FOLD BACK relay contacts change to Fail state
after delay when alarm is assigned to relay contacts.
8.4.16.
No Battery Temperature Sensor
Indicates disabled or failed remote temperature sensor. Alarm/communications circuit board NO
BATT TEMP SENSOR relay contacts change to Fail state after delay when alarm is assigned to relay
contacts.
8.4.17.
Current Limiting
Indicates the charger is operating at maximum allowable output, either the maximum current
setting or maximum power output (whichever occurs first). Alarm/communications circuit board
CURRENT LIMIT relay contacts change to Fail state after delay when alarm is assigned to relay
contacts.
8.4.18.
Ground Fault
Indicates a short circuit or high impedance leakage current (greater than 500uA) exists from the
charger positive or negative output to ground. Chargers intended for genset applications are
shipped with the ground fault alarm disabled. Chargers intended for Marine and stationary power
applications are shipped with ground fault enabled. Disable the alarm using the front panel
keypad. Alarm/communications circuit board GROUND FAULT relay contacts change to Fail state
after delay when alarm is assigned to relay contacts.
The RJ-45 port used for communications is not isolated from the charger output. Non-isolated
communications equipment/adapters connected to the RJ-45 port may cause a ground fault
alarm.
When multiple chargers are operated in parallel and the ground fault alarm is desired, physically
remove the ground fault jumper on all but one charger. The ground fault jumper is located on the
leftmost internal charger module (see Figures 13-14). Access to the jumper requires removing the
top cover on the S4 charger. Remove the lower cover first and then remove 6 screws on the
upper front of the charger to remove the top cover.
For chargers with multiple outputs, ground fault detection is always indicated on output A.
Chargers with multiple outputs have a common output return line and there is a single ground
fault alarm for all outputs.
