Alarm Interface - GE Hydran 201i Instruction Manual

Hydran* 201i Instruction Manual
1.1.1.2 Latch Mode
In this mode, the relay status changes if an alarm condition is detected during a
period of time exceeding the corresponding alarm delay; the relay returns to its former
status when the alarm condition disappears during a period of time exceeding the same
alarm delay and when the alarm is acknowledged by the user (using the Hydran 201Ti's
keypad or the Hydran Host software).
Note: Only pushing the Hydran 201Ci-1's push-buttons is not enough to acknowledge an
alarm.
Read also the points in the Normal mode (Section 1.1.1.1 above).
1.1.1.3 Force OFF
In this mode, the relay does not respond to changes in alarm conditions; the relay's
power always remains off. This mode is used mainly to test the alarm relays or disable
an alarm circuit.
1.1.1.4 Force ON
In this mode, the relay does not respond to changes in alarm conditions; the relay's
power always remains on. This mode is used mainly to test the alarm relays or disable
an alarm circuit.

11.3 Alarm Interface

The alarm interface between the Hydran 201i System and the user can take different
forms. When an alarm is triggered, the following actions are generated:
1. An alarm message flashes on the Hydran 201Ti's display. For example: Gas
H;250ppm (the gas level exceeds the gas High alarm set point, which is currently
set to 250ppm). For the complete list of alarm messages, see Section 13.1; for
details on the display of alarm messages, see Section 5.2.1.
2. The status of the corresponding alarm relay changes. The classic interface
method consists in linking the relays' alarm contacts of the Hydran 201Ci
Controller (or H201Ti) to an alarm panel (or any other SCADA system) located in
such a way that an alarm being triggered would immediately warn the operator.
For details, see Section 12.1.2.
3. An alarm signal is transmitted (through the supervisory link) to the H201Ci and
from the latter to the host computer. The Hydran Host software (if running)
displays an alarm window. This way, the state of the alarms can be continuously
monitored (locally or remotely) or verified periodically.
4. A call can be made to a host computer via modem (see the CommMode
parameter in the H201Ti's Communication submenu; Section 5.5.6.2).
5. The two illuminated push-buttons (alarm indicators) mounted on the door of the
Hydran 201Ci-1 (the Hydran 201Ci-C is not equipped with push-buttons) indicate
the status of the gas alarms. Each push-button turns on when the corresponding
MA-033 Rev. 14.0, 12-Nov-18
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