Waters Prep Series Installation And Maintenance Manual page 177

Electrical specifications (Continued)
Item
Time or operator
controllable switch
closures
Auxiliary power
supply
Hold output
Chart output
(analog signal)
Press output
(analog signal)
Ground terminals
Specification
Four controllable switch closures to ground. Open
collector terminals pulled up to +5 VAC through 10 K
ohm resistors. Can be pulled up to 12 VAC.
Maximum allowable current = 1.0 A total. Maximum
allowable voltage = 12 VAC. Outputs are controlled
directly from keyboard or events program.
Two modes available from keyboard and events
program:
• ON = Switch closed to ground.
• OFF = Switch open (+5 VAC to ground).
Additional mode available from events program:
• Pulse = Single contact closure to opposite state for
100 ms.
12 VAC to ground fused supply. 1.3-A maximum
current.
One open connector switch closure to ground.
Maximum current sink 40 mA. Low output indicates
pumps stopped due to:
• Exceeding high pressure limit
• Below low pressure limit
• Abort input
• Startup condition
Used to communicate with Hold input on Waters
autoinjectors or other compatible inputs to prevent
further injections.
Two terminals (+, –) for recording pump flow rate
traces or monitoring solvent composition (10-mV
output).
Two terminals (+, –) for recording pump pressure
traces (10-mV output).
Connected to signal ground used as reference for
outputs (Hold, INJect, and switches S1 to S4), inputs
(Inject and Abort), or 12 VAC power supply (not for
use with 10-mV outputs).
B-3