User Manual Manual

Functions 3-40
Publication 825-UM001B-EN-P January 2001
Connection of the Main Relay (MR)
The main output relay can be operated as electrically held or non-fail-safe.
Electrically Held Mode
Non-Fail-Safe Mode
Note: Terminal markings should be changed from those used in electrically held mode when
switching to this mode.
Applications of the Non-Fail-Safe Connection
The non-fail-safe connection is suitable for use in situations where the failure of the control
voltage must not interrupt the process:
• Chemical processes
• Kneaders and mixers in which the mass would solidify
• Fresh air fans
• Cooling pumps, etc.
Connection of the Alarm Relay (AL)
In firmware versions before 2.18 the alarm relay was connected in the non-fail-safe mode.
Since V2.18 (and later) it can also be connected in the electrically held mode.
95
96
97
98
Supply Off
S
upply
O
n
S
upply
O
n and Trip
97
98
95
96
Supply Off
Supply On Supply On and Trip