Vent Valve Operation - Manual Venting (Serial Command) - Agilent Technologies TwisTorr Medium-TMP Rack User Manual

Technical Information
Vent Valve Operation – Manual Venting (SERIAL COMMAND)
The vent valve is operated manually, either via FRONT panel or via SERIAL
command.
Via SERIAL command, use WIN 122 = 1.
After pump STOP command, the vent valve stays closed waiting for command
given to the vent valve (WIN122 = 1 = open). When the command OPEN VALVE is
given, the controller performs a CONTROLLED VENTING (see dedicated paragraph)
to reduce the rotational speed down to 100 Hz.
After the pump has reached 100Hz, the valve is closed for a time defined by WIN
126 (delay), then it opens as set in WIN 147.
If WIN147 = 0, the valve remains open until next START command. If WIN 147 ≠0,
the valve opens for the time indicated. Then it closes until the next START
command.
Please refer to following graph:
Reference to existing description: ON COMMAND, WIN 125 = 0.
If the pump is STARTING or in NORMAL OPERATION or in AUTOTUNING, the
NOTE
controller rejects the command OPEN VALVE.
Agilent TwisTorr Medium-TMP Rack Controller User Manual 163