Vinten Radamec SP-2000 Pedestal - Manual (Page 97)

SP-2000/X-Y Maintenance And Repair
User Manual 4-31
Battery Pack and Power Management
The Battery Pack board manages the power to the pedestal. When the Standby/
Charge button is pressed, the enable signal to the rack mounted AC power sup-
ply is pulled low. This trickle charges the batteries at the rate of approximately
0.5 amps. The maximum charge voltage is set at the factory by pots on the Bat-
tery Pack board. These pots should not normally be readjusted. However, cali-
bration information is provided on the schematic should you need to make an
adjustment. Overvoltage should be avoided as it offers no advantage and greatly
shortens battery life. Battery life under normal operation should exceed five
years.
The battery voltage is displayed on the LED voltmeter on the pedestal control
panel. Depending on usage and how well the head and pedestal are balanced,
the batteries should have enough capacity to run the dolly for several hours.
Complete recharging takes overnight. Charging also takes place during normal
AC powered operation in either the Standby/Charge or Run modes.
When the Run button is pressed, a chassis mounted relay connects power to the
rest of the pedestal. If the AC power supply is connected via the cable to the
pedestal, it will be turned on (if it was not already on), and supply voltages are
passed through the Battery Pack board to the rest of the pedestal. If the voltage
from the power supply drops out, the batteries will catch the load and maintain
pedestal power. When the batteries are drained to the 10% point and only deliver
21 volts, the Battery Pack board will power down the dolly.
When operating without the AC power supply, the Run button starts delivery of
battery power to the pedestal, under the control of the Battery Pack board. The
battery pack also sources momentary high current demands made by the pedes-
tal, even when the system is AC powered. This permits the use of cables that are
lighter and longer than on previous systems.