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DSE Model 8620 AMF Controller Operators Manual
14
Flexible sensor
Number
2
Measurement type
Resistance measurement by measuring voltage across sensor with a fixed current
applied
Arrangement
Differential resistance measurement input
Measurement current
10mA
Full scale
480
Ω
Over range / fail
540
Ω
Resolution
1%
Accuracy
±2% of full scale resistance (±9.6
Ω
) excluding transducer error
Max common mode voltage
±2V
Display range
0-250%
3.6.2 CHARGE FAIL INPUT
Minimum voltage
0V
Maximum voltage
35V (plant supply)
Resolution
0.2V
Accuracy
± 1% of max measured voltage
Excitation
Active circuit constant power output
Output Power
2.5W Nominal @12V and 24V
Current at 12V
210mA
Current at 24V
105mA
The charge fail input is actually a combined input and output. Whenever the generator is required to
run, the terminal provides excitation current to the charge alternator field winding.
When the charge alternator is correctly charging the battery, the voltage of the terminal is close to the
plant battery supply voltage. In a failed charge situation, the voltage of this terminal is pulled down to a
low voltage. It is this drop in voltage that triggers the charge failure alarm. The level at which this
operates and whether this triggers a warning or shutdown alarm is configurable using the DSE Config
Suite Software.
3.6.3 MAGNETIC PICKUP
Type
Single ended input, capacitive coupled
Minimum voltage
0.5V RMS
Max common mode voltage
±2V
Maximum voltage
Clamped to ±70V by transient suppressers, dissipation not to exceed 1W.
Maximum frequency
10,000Hz
Resolution
6.25 RPM
Accuracy
±25 RPM
Flywheel teeth
10 to 500
NOTE : DSE can supply a suitable magnetic pickup device, available in two body thread
lengths :
DSE Part number 020-012 - Magnetic Pickup probe 5/8 UNF 2½” thread length
DSE Part number 020-013 - Magnetic Pickup probe 5/8 UNF 4” thread length
Magnetic Pickup devices can often be ‘shared’ between two or more devices. For example, one device
can often supply the signal to both the DSE8600 series module and the engine governor. The possibility
of this depends upon the amount of current that the magnetic pickup can supply.