8.7.6 Emergency stop
You can configure one of the controller's digital inputs as the emergency stop.
When this input is present, the alarm is always enabled. The alarm parameters are not
visible. The alarm action is
Trip generator breaker and shutdown engine
, latch enabled.
low
high
Digital
input
time
t
delay
Assign the
Emergency stop
input under
Configure > Input/output
. Select the hardware module, then select the input to configure.
Function
I/O
Type
Details
Alarm system > Additional
functions > Emergency stop
Digital input Continuous
Wire the emergency stop digital input so that it is normally activated. If
the emergency stop digital input is not activated, then controller
activates the
Emergency stop
alarm.
CAUTION
The
Emergency stop
is part of the safety chain, and this digital input function should only be used to inform the controller of
the emergency stop. However, the controller's emergency stop input cannot be used as the system's only emergency stop.
For example, if the controller is unpowered, it cannot respond to the emergency stop digital input.
8.7.7 Overspeed
These two alarms are for overspeed protection.
The alarm response is based on the genset speed, as measured by the MPU/W/NPN/PNP
input.
Set
point
Value
time
Delay
Configure these parameters under
Configure > Parameters > Engine > Protections > Overspeed #
, where # is 1 or 2.
Table 8.31
Default parameters
Parameter
Range
Overspeed 1
Overspeed 2
Set point
10 to 150 % of nominal speed
110 %
120 %
Delay
0 s to 3 min
5 s
1 s
Enable
Not enabled, Enabled
Not enabled
Not enabled
Latch
Not enabled, Enabled
Not enabled
Enabled
Action
Warning
Trip generator breaker and shutdown engine
INFO
In addition to these overspeed alarms, one of the controller's digital inputs can be connected to hardware that detects
overspeed. A customised alarm for overspeed can then be configured on that digital input.
DESIGNER'S HANDBOOK 4189340911K UK
Page 313 of 521