GE Hydran 201i, Instruction Manual, Page: 194 / 300

Chapter 10 • Alarms
10-4 Rev. 6, March 2011 Part 17997
10.2 ALARM RELAYS
The Hydran 201T i and the Hydran 201C i -1 both have three alarm relays, in other words
one relay per alarm level:
• One gas High alarm relay
• One gas High-High alarm relay
• One fail alarm relay, referred to as
System in the H201T i ’s menus
Note: The Hydran 201Ci-C does not have alarm relays. The H201Ci-1 alarm relays are
more accessible than the H201Ti’s relays. Generally, the H201Ci-1 alarm relays are the
ones connected to an alarm panel or SCADA system.
10.2.1 Alarm Contacts
Each relay has:
• A normally open (NO) contact
• A normally closed (NC) contact
• A common contact (Type C)
The physical form of these contacts is as follows:
• Hydran 201T i : See the Alarm Contacts 9-Terminal Block (item 12 in Figure 2-5 on
page 2-9).
• Hydran 201C i -1: See the terminals 7 to 15 of the Main Terminal Block (item 6 in
Figure 3-6 on page 3-11).
• Hydran 201C i -C: Does not have alarm relays and thus no alarm contacts.
10.2.2 Status of Alarm Relays
The gas High and High-High alarm relays can only be in two states:
• On (coil energized, alarm state LED’s turned on)
• Off (coil de-energized, alarm state LED’s off)
Note: The relays of the Hydran 201Ci Controller always adopt the state of the
Hydran 201Ti’s corresponding relay (except if the supervisory link is broken, in which case