Nor-Cal IQ+ Adaptive Pressure Controller - Manual (Page 32)

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IQ+ OP-LIT 9/08
9.0 - battery back-Up
Some APC models, including the IQ+ controller, are available with a power safe battery back-up option. When installed, this feature will drive the valve closed
in the event of a power interruption to the APC controller. This is more commonly of interest when throttling gate- or pendulum valves are used, because these
valves typically also serve as the vacuum line isolation valve. The following describes the general functionality and specifications of the battery back-up feature.
Battery Back-up Activation and Operation
The controller software continuously monitors the operating voltage delivered
to it by the internal Power Supply. If that voltage drops below a certain thresh-
old level for more than 50 msec, then the IQ+ disconnects all external power
outputs (such as ±15 VDC), exits its present operational state and drives the
valve closed using battery power. Once the valve is closed, the
IQ+ disconnects itself altogether and shuts down.
Valve Close Speed
The speed at which the valve closes under battery
power is the same as during normal operation.
Resuming Normal Operation
Once normal power is back on, the IQ+ controller will reinitialize the butterfly
valve and be ready for operation after about 30 seconds. However, if the IQ+
controller is configured with the valve initialization safety lock function, then
the
J4 serial command needs to be issued before valve initialization can occur.
Battery Pack Information
Specially packaged 15-cell, 18V 500 mA·H Ni-Cd battery assembly.
Battery Life
Depends on various factors including temperature, number of discharge
cycles, battery age, starting charge and valve type. Generally, however, a
new freshly charged battery should close a typical gate- or pendulum valve
ten times, or more, without being depleted to the point where full
actuation is no longer possible.
Recharge Time
Depends on various factors including battery age, state of discharge and to a
lesser degree temperature. Under normal conditions, a fully depleted battery
should charge completely in approximately 5 hours. Recharging occurs auto-
matically provided that the battery is still capable of being charged.
Battery Status
The battery voltage can be read by issuing the RS232 serial command Gv . The
controller will respond with the internal Power Supply voltage and the battery
voltage as measured on the main PCB.
NOTE: The battery voltage reported may not be a true
indication of the battery’s condition, because the voltage is read
while the battery is in an unloaded state. Nor-Cal recommends
replacing the battery approximately every 24 months, irrespective
of apparent condition or usage history. Please refer to
Appendix I for ordering information. Always obtain
replacement battery packs from Nor-Cal Products.
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IQ+ OP-LIT 9/08
NOTE: If a Slave valve has a problem of any kind, the Master
will indicate this by flashing the fault LED. For all other
conditions, the Master LEDs operate the same as a standard
IQ+ controller.
8.13 - master/Slave Object
(continued)
led StatuS
Flashing Green Network OK device online
Green Network OK connection
established
Flashing Red Connection timed out
TAbLE – 8.13.5 SLAvE NETWORk LED STATUS