KD Scientific 200 Series - Manual (Page 17)

13
KDS Model 200 Series
Operating Instructions
(Continued)
CLEARING A STALL CONDITION
Should a stall occur the pump motor is stopped to prevent damage.
To clear the display press select.
To move the stalled mechanism use the fast forward or fast reverse to move the pusher
block. Using the fast forward or fast reverse feature is not only the most simple way to deal
with the stall, it also reduces potential damage to the cam mechanism which releases the
halfnut from the leadscrew.
NV Ram Failure
If the settings in the non-volatile memory become corrupted the display will read "NV Ram
Failure" and the pump will not operate.
To recover from this condition the pump must be powered down and then turned on again
after a few seconds delay. The pump will be re-initialized to the default settings and can now
be programmed as normal.
If the above fails to work the “NV Ram Failure” message can also be cleared by pressing
select and programming a new flow rate. The pump should then be turned off and on to
save the settings.
RS232 Setup
The RS232 connections are made through two modular telephone connectors, labeled IN
and OUT , located on the rear panel.
A single PC can control up to 100 pumps via a "daisy chain" using the IN and OUT
connectors. When using the daisy chain each pump must be assigned an address and set to
the same baud rate. A splitter may be required with greater than 50 pumps.
When controlled via RS232 the pump will still respond to keypad commands but will not
respond to keypad and RS232 commands simultaneously. All RS232 command settings,
similar to keypad settings, are stored in non-volatile memory.
Select RS232 from the main menu.
Baud Rate 300, 1200, 2400, 4800, 9600
The available baud rates will now be displayed and can be selected
using the arrow and select keys.
The display now prompts for assignment of a pump address.
Address
If, no address is assigned then the pump defaults to a 0 setting.
All pumps with the same address respond simultaneously to the same
commands.
Use the key to enter an address, 0 - 99 and press select to return
to the main menu.
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