Product Manual
78 | SAMLEX AMERICA INC. SAMLEX AMERICA INC. | 79
4.9 COOLING AND OVER TEMPERATURE PROTECTION
4.9.1 Cooling Fans
The unit is cooled by convection and by forced air cooling using 2 variable speed cooling fans.
Temperature is sensed at the Power Transformer and H-Bridge Power Mosfets / Heat Sink. The
fans will be switched ON at specied temperatures measured at the above sense points. The
speed of the fans is increased as the temperature rises.
4.9.2 Over Temperature Protection
Refer to Fault Messages and Troubleshooting Guide at Table 7.1 of the Owner's Manual for
Remote Control EVO-RC-PLUS. The unit goes to Fault Mode and shuts down due to over tem-
perature sensed at the Main Power Transformer and the Heat Sink for the Power Mosfets: Fault
messages and temperature thresholds for shut down and auto-reset are as follows:
• “Transformer over heat!” : Shut down at 150°C and auto-reset at 80°C
•
“Heat sink over heat!” :
Shut down at 70°C and auto-reset at 40°C
4.9.3 Automatic Reduction Of Charging Current In Higher Ambient Temperatures
In order to protect against over temperature shut down when operating in higher ambient
temperatures of 50°C to 60°C, the BULK CURRENT setting is automatically reduced as follows based
on temperature sensed at the Power Transformer and at the Heat Sink for the Power Mosfets:
• Power Transformer: In case the temperature is >130°C, the BULK CURRENT setting is
reduced by 0.2% every 20 sec.
•
Heat Sink:
In case the temperature is >90°C, the charging current is reduced by 0.2%
every 20 sec.
4.10 OPTIONAL REMOTE CONTROL EVO-RC-PLUS FOR PROGRAMMING
OF MODES OF OPERATION AND PARAMETERS
Optional Remote Control Model EVO-RC-PLUS [Fig 2.4(a)] will be required for more advanced
control and monitoring. Please see separate Owner’s Manual for EVO-RC-PLUS. The Remote
Control comes with 10M / 33 ft., RJ-45 Data Cable. The Remote plugs into RJ-45 Jack on the
front panel of the unit (7, Fig 2.1). It has provision for Data Logging using SD Card of up to 16 GB
(FAT16 / FAT32). It also has its own Real Time Clock and Super Capacitor Type of Internal Battery.
The Remote Control will be required for Firmware upgrade through the SD Card.
Detailed messaging is available through its LCD display and LEDs. This remote will also be required
for programming of various parameters to suit specic requirements. Each programmable
parameter has a Default Value. This unit has been shipped with the various parameters set
at the Default Values. Programmable and Default values are shown in Tables 6.2 to 6.6.
i
INFO
For background information on batteries and charging process, please read
Section 1.4, “General Information - Lead Acid Batteries”. All battery charging
voltages are specied at battery temperature of 25˚C / 77˚F.
SECTION 4 | General Description & Principles of Operations