Force Off; Force On; Alarm Interface - GE Hydran 201 i Instruction Manual

10.2.3.3

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.
10.2.3.4

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.
10.3

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;250 ppm (the gas level exceeds the gas High alarm set point, which is
currently set to 250 ppm). For the complete list of alarm messages, see Section 12.1
on page 12-1; for details on the display of alarm messages, see Section 4.2.1 on
page 4-3.
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 11.1.2 on page 11-2.
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 4.5.6.2 on page 4-22).
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
Part 17997 Rev. 6, March 2011
Alarm Interface
10-7