APG PG7 user manual - Manual (Page 22)

PG7 Rev. A, 12/09
22
Automation Products Group, Inc.
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Trip Points: The optional trip point relay outputs can be configured to perform
one of six different logic functions as described below and on the chart on the
next page.
IMPORTANT NOTE: The trip point outputs are solid state relays rated for a
maximum switched load of 130 mA.
Trip Relay Output Types (T1TYPE or T2TYPE): determines the logic
function of the output relays (see chart on next page).
"Type 0" or Normally Closed setting will close the trip relay whenever the
pressure is less than the Trip Pressure setting.
"Type 1" or Exclusive setting will close the trip relay whenever the pressure is
less than the Trip Pressure or greater than the Trip Pressure + Trip Window.
"Type 2" or Normally Closed with Hysteresis setting will close the trip relay
when the pressure drops below the Trip Pressure. Once closed, the trip relay
will remain closed until the pressure becomes greater than the Trip Pressure +
Trip Window, at which point the trip relay will open. Once open the trip relay
will remain open until the pressure once again drops below the Trip Pressure
setting.
"Type 3" or Normally Open setting will close the relay whenever the pressure
is greater than the Trip Pressure setting.
"Type 4" or Inclusive setting will close the relay whenever the pressure is
within the Trip Window pressure range (greater than the Trip Pressure, less than
the Trip Pressure + Trip Window).
"Type 5" or Normally Open with Hysteresis is used for pump up applications,
or for a low level alarm with hysteresis function. This is the opposite function
of the Type 2.