A533-23-880 Issue C
Page 10
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INTRODUCTION
1.10
Controls and indicators
Refer to Figure 6. The controls and indicators on the dashboard of the iF system are as follows:
Emergency stop switch (1): Press this to immediately shut down the iF system in an emergency: refer to Section 5.11.
Pump Display Terminal (2): Use this to control the iF system: refer to Section 1.11.
Shaft-seal purge pressure warning LED (3): This yellow LED is on when the shaft-seals purge nitrogen pressure is too
high or too low.
Nitrogen supply pressure regulator (4): Use this to adjust the nitrogen supply pressure.
Shaft-seal purge pressure high and low LEDs (5, 6): These green LEDs are both on when the shaft-seals purge nitrogen
pressure is acceptable. The pressure high LED (5) is off when the pressure is too low, and the pressure low LED (6) is
off when the pressure is too high.
Power OK LED (7): This green LED is on when the 24 V electrical supply to the Control Module is on.
Running LED (8): This green LED is on when the iF pumps are operating.
Alarm LED (9): This red LED is on when an alarm condition exists: refer to Section 1.11.2
Warning LED (10): This yellow LED is on when a warning condition exists: refer to Section 1.11.2
1.11
Control functions
1.11.1
Priority of control
The iF system can be controlled by a number of modules: the Pump Display Terminal, an iF Interface Module (refer
to Section 8.5.2); or the iF Single Pumpset Monitor (refer to Section 8.5.3). Only one module can have control of the
iF system at any one time. That is, once a module has control of the iF system, control requests from another Module
are denied.
To allow another Module to control the iF system:
The Module which currently has control must 'release' control (that is, you must send the appropriate
message on the network or press the appropriate button to release control).
Any Module which requires control must then 'take' control (that is, you must send the appropriate message
to the iF system or press the appropriate button to take control).
Note that when you first switch-on the electrical supply, no Module will initially have control of the iF system. The
Module which you want to control the iF system must take control as described above.
