19. Analog Outputs (J22): This connector is factory-wired to the terminal block
between pins 17 and 20.
20. Alarm Contacts Connector, 9 Pins (J18): The Gas High, Gas High-High and System
OK alarm relays are factory-wired from this connector to the terminal block
between pins 7 and 15. A three-wire type-C (Normally Open + Normally Closed +
Common) set of contacts is available for each alarm.
Note: The System OK alarm relay is normally energized. When a system fault occurs,
it de-energizes the relay. Thus, the Normally Open (NO) contact actually opens on
system failure or power loss. See Chapter 11 for a description of the Hydran alarms.
21. AC Supply Fuses (F11): There is one fuse holder for standard 5 x 20 mm fuses (the
rating can be found in Section 14.9).
22. AC Supply Connector, 3 Pins (J2): The AC line is factory-wired from the AC
terminal block to this connector.
23. Heater Connector, 6 Pins (J3): The enclosure heater is factory-wired to the
connector J3. It consists of two 50-W resistors located under the support bracket
of the electronic circuit board.
24. Voltage Selector Switch (SW1): For wiring details, see a: The voltage selector is
factory-selected and configured as per user requirements
25. Table D - 12 in Appendix D. This selector is used to choose between the following:
• 115 V, corresponding to 100–120 VAC 50/60 Hz
• 230 V, corresponding to 200–240 VAC 50/60 Hz
26. Configuration Communication Status Indicator, Yellow (DS7): This LED, only used
for programming purposes at the factory, indicates there is a configuration of the
unit through one of the serial ports. It flickers as data bits pass through the
H201Ci-1, whatever the direction and the port (RS-232, RS-485 LAN, USB or
optional modem).
27. Communication Status Indicator, Yellow (DS6): This LED indicates that serial
communication activity is present. It flickers as data bits pass through the
H201Ci-1, whatever the direction and the port (RS-232, RS-485 LAN, USB or
supervisory link).
28. Alarm 1 High Latch Indicator, Red-Orange (DS5): This LED indicates that the
operator did not acknowledge the alarm 1 (Gas High). It is impossible to
acknowledge the alarm if it is still active.
29. Alarm 2 High-High Latch Indicator, Red-Orange (DS4): This LED indicates that the
operator did not acknowledge the alarm 2 (Gas High-High). It is impossible to
acknowledge the alarm if it is still active.
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