Ampcontrol Pty Ltd
– ABN 28 000 915 542
PF1 USER MANUAL
MAG-165 Version 6
– March/2020
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 57 of 71
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Filtered Stop
If the Programmable Input (PI) is configured to operate as a Filtered Stop, the PF1 will issue a STOP
command if the PI input is activated for a period of time that exceeds the configured filter time.
This function is useful for interfacing other protection devices with the PF1. In such installations it is
prudent to ensure that the PF1 relay is issued a STOP command when another protection device trips
the outlet.
CAUTION!
The Filtered Stop Input (along with the STOP input) are control inputs
only and should not be used to actuate protection functions. Any
tripping contacts wired into these inputs should also be duplicated in the
outlet’s tripping circuit.
It is recommended that the Filtered Stop input is used to monitor the states of the outlet’s other
protection devices (if present), rather than the STOP input. The reason for this is that, especially at the
application of control power, race conditions may exist between protection relays. To avoid this, the
“Filter Period” should be set to a time period that exceeds the expected initialisation period of these
relays.
NOTE
The Filtered Stop inputs
will not function if neither the Pump Mode
nor the Fan Mode is selected
. If the PF1 is operating as an EL and/or
EC relay only, the function of the K1 output relay will depend solely
upon the health of those protection functions.
The PF1 r
elay’s Programmable Input (PI) can be configured to act as a “Filtered Stop” input using the
Smart Tools software. Adjustable settings are: Function, Default State, and Filter Period.
Table 24: PI Filtered Stop - Configuration - via Smart Tools PC Software
Function
Default State
Filter Period
None
Normally Open
1 seconds
Filtered Stop
Normally Closed
2 seconds
3 seconds
4 seconds
5 seconds
10 seconds
The Default State can be configured as Normally Open or Normally Closed. If configured as Normally
Open, the Filtered Stop function will be activated if the PI input is closed onto the VDC supply. If
configured as Normally Closed, the Filtered Stop function will be activated if the PI input’s connection to
the VDC supply is removed (opened).
The Filter Period is the length of time that the input must be activated before the PF1 will issue a STOP
command. For example, if the Filter Period is set to 5 seconds and the PI input is only active for 4
seconds, the PF1 will not issue a STOP command. In this case, the PF1 will issue a STOP command
only if the PI input exceeds the 5 second filter period.
