Ampcontrol IPD - Fan Control; Fan Interlocking

Ampcontrol Pty Ltd – ABN 28 000 915 542
IPD USER MANUAL
IPDB014 Version 14 – SEP/2020
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 54 of 96
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12 FAN CONTROL
12.1 Fan Interlocking
A fan interlocking facility can be selected to prevent outlets from being energised until a mine section
ventilation fan is operational. This facility eliminates the need for dedicated outlets. The configuration of
the fan interlocking system is shown on Drawing IPDB003 in Appendix A – Drawings.
Each relay is linked together via the “FIO” (Fan Interlock Input/Output Terminal).
For single fan operation a 100 Ω resistor is connected between this link and earth. This causes all relays
in the system to default to a “Slave” mode waiting to receive an interlocking signal before they can run.
For dual fan operation it is necessary to connect two 100 Ω resistors in parallel to the FIO Terminal,
otherwise all FIR Inputs will read as off and the slave outlets will not run.
When an IPD Relay detects a Remote Termination Unit that has been programmed with the special
machine type identifier “iFan” that particular relay switches to a “Master” configuration. This relay
controls the slave outlets allowing them to run when the fan current is above the selected threshold
setting.
Each relay has the ability to read and drive the FIO link via the Fan Input Read (FIR) processor input and
the Fan Interlock Drive (FID) processor output. The status of the input/output can be viewed on the
Remote Display Module - “Relay and Digital Input Status” Section (Level 6, Position 4).
The outlet control in each IPD Relay has been designed so that an outlet will not run unless either:
a) The FIR input is “ON”, or
b) The Remote Termination Unit connected to that IPD has been programmed with machine type
“iFan”.
The result of these conditions is reflected in an internal Fan Run Status (FRS) bit. The status of this can
be viewed on the Remote Display Module. If the FRS is on, then the fan interlocking system will allow
the associated outlet to run.
Relay 3 can be selected to be either non-functional (off) or can be configured to follow the Fan Interlock
Drive (FID) or Fan Interlock Read (FIR) outputs of the Relay.
For single fan operation select FID or FIR. Relay 3 will energise as soon as current is above the
preselected threshold.
If FID is selected for dual fan operation then Relay 3 will energise as soon as current from either fan is
above the preselected threshold. If FIR is selected Relay 3 will only energise if the current from both fans
are above the preselected threshold.