Taylor-Dunn MX-026-00, Operation, Maintenance, And Replacement Parts Manual

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Battery Charger
Page 20
Testing the Charging Cycle
In typical installations, the charger will remain on for up to 12 hours depending on the state of charge of the batteries when the
charge cycle was started.
NOTE: Charging time is limited to 18 hours (max). An error occurs if charging time exceeds 18 hours. See table on previous
page.
A charger could remain on for longer than 12 hours if:
• The vehicle is equipped with batteries larger than 220 Amp hour capacity.
• The charging cycle is interrupted at any time during the charging cycle.
• Defective batteries causing a fluctuating DC voltage that confuses the charger.
• One or more defective cells in the battery pack.
• A brownout (drop in AC line voltage) during the charging cycle.
• An electrically noisy charging environment.
A charger could turn off in less than 12 hours, but still show symptoms of overcharging if:
• The electrolyte in the batteries is too high (boil over).
• The electrolyte in the batteries is too low (excessive gassing or sulphur smell).
To test the charger to see if it is turning off correctly, monitor the battery voltage and charging current during the charging cycle
as indicated below.
Using a digit digital voltmeter and clamp on DC ammeter, monitor the battery voltage and current during the charging cycle. The
charging current should remain within 10% of the DC output current (see previous page) until the battery voltage reaches 2.55
VPC. When the voltage reaches 2.55 VPC, the charging current will drop significantly and slowly taper off (voltage will remain
constant). The charger should turn off within 2 to 4 hours after entering the second stage.
HB/PT and GEL Indicator Lamps
NOTE: Your charger may not be equipped with these lamps.
HB/PT Lamp
If the HB/PT lamp is “ON”, then the charger has overheated and has
entered a proportionally reduced output. The charging cycle will terminate
if the temperature continues to rise. If the charging cycle is terminated, the
charger will automatically restart once it has cooled.
The charging cycle is limited to 18-hours. If the HB/PT lamp is flashing, then
the charging time has exceeded 18-hours (time is limited to 18-hours). If
any of the status lamps are flashing, then the charge cycle did not complete.
GEL Lamp
This LED will only be “ON” if the charger is configured for GEL batteries.
Using a GEL charger with non-GEL batteries may result in an incomplete
charge or long charge times.