Murphy EMS-GC10 - Page 51

Section 75 00-02-0878
2013-03-07 - 45 -
AMF MB Opening (Parameters 7060–7066 U Mains Failure)
It is possible to select the functionality of the mains breaker closing function. This is
necessary if the unit operates in Automatic Mains Failure (AMF).
The possibilities are:
Selection Description
Start engine and open
mains breaker
When a mains failure occurs, the mains breaker opens, and the engine starts at
the same time.
Start engine
When a mains failure occurs, the engine starts. When the generator is running
and the frequency and voltage are OK, the MB opens and the GB closes.
AMF Timers
The time charts describe the functionality at a mains failure and at mains return. The
timers used by the AMF function are indicated in the table below:
Timer Description Parameter Number
t
FD Mains failure delay
7070–7074 f mains failure
7060–7066 U mains failure
t
F/U
Frequency / Voltage OK
(
t
V/F, Voltage / Frequency/ OK)
6220 Hz/V OK
t
FOD Mains failure OK delay
7070–7074 f mains failure
7060–7066 U mains failure
t
GBC GB ON delay 6230–6232 GB control
t
MBC MB ON delay 7080–7085 MB control
Example 1:
Parameter 7065 Mains fail control: Start engine and open MB
NOTE: The Terms:
t
F/U (Frequency / Voltage) and
t
V/F (Voltage /
Frequency) represent the same value.