Ransburg Serial Analog Module A11012 - Manual (Page 8)

LN-9258-07.2
GENERAL DESCRIPTION
Serial Analog Module - Introduction
INTRODUCTION
5
The Serial Analog Module is a plug-in electro-
pneumatic control board designed to fit standard
racks. The module has two independent pressure
control channels. Each channel adjusts the output
pressure proportionally to the voltage input.
When one output is used to pilot a volume booster
(regulator), the volume booster must have a
non-bleed pilot, such as P/N: A11111.00. Use
of a volume booster with a bleed pilot will cause
fluctuating output pressure. When using the Se-
rial Analog Module for a retro-fit application, refer
to the last page of Operation section for details.
Pneumatic connections are made through a plug-
in edge connector which eliminates the need for
pneumatic fittings. Electrical connections are
achieved with a DIN 41612-B connector.
Figure 1: Serial Analog Module
The Serial Analog Module is configured for output
pressure bleed on power down. It has a normally
closed valve on the supply and a normally open
valve on the exhaust; the output will therefore vent
to atmosphere on power failure or power down.
Remote pressure sensing is standard on -01
Modules. This is achieved by connecting the
transducer sense pneumatic line to the input
side of external devices. Pressure inaccuracies
of devices such as pilot regulators are therefore
compensated by means of closed-loop feedback.
On both channels, pressure transducer output
is pinned-out through the electrical connector.
These signals may be used to drive a meter or to
provide computer-control feedback. In addition,
there is a digital output for each channel; the logic
level is low when the pressure controller is in a
stable state.
On the front panel, LED's indicate when each
channel is stable. Front panel potentiometers
provide manual control of pressure output. A
status signal is provided giving a logic low output
when the panel controls are activated. This can
alert the controller when the module is in the local/
manual mode.