DER2 digital regulator instruction manual - rev. 02 - pag. 30
The status of active alarms is stored at location L[38], which can be read with the USB connection.
The index of bits that have a value of 1 corresponds to the active alarm. If the regulator is correctly working
(no alarm active) the bit 11 will be high.
CONTROLLING OF REGULATOR ALARMS
N. Description of event
Action
1
Checksum EEprom
Reset default data - Blockage
2
Over voltage (at rated speed)
APO
3
Under voltage (at rated speed)
APO
4
Short circuit
APO, Maximum current - Blockage
5
Excitation Overcurrent
APO, Reduction of excitation current
6
Underspeed
APO, V/F Ramp
7
Overspeed
APO
TABLE 12 : ALARMS LIST
8
Underexcitation / loss of excitation
APO
TABLE 13 : ALARM FLAGS AT LOCATION L[38]
B
15
B
14
B
13
B
12
B
11
B
10
B
9
B
8
B
7
B
6
B
5
B
4
B
3
B
2
B
1
B
0
32768 16384
8192
4096 2048 1024 512 256
128
64
32
16
8
4
2
1
A12 A11 A10 A9
A8
A7
A6
A5
A4
A3
A2
A1
J50/60
-
Reserved Reserved
OK
-
-
- Underexcitation Over
speed
Under
speed
Over Excitation Short Under
voltage
Over
voltage
Check sum
EEPROM
Location L[38] (third “STATUS” box)
Example:
Location 38 = 48 = 0000000000110000
2
: it means that Bits B5 and B4 are at 1, therefore alarms A6 and A5
are active.
1. Alarm signals with the indicator lights
During normal operation and a duty cycle of 50% (OK in fig. 11) an indicator light mounted on the board
flashes every 2 seconds; it flashes differently in the event of intervention or alarm, as indicated in fig. 11.
OK
CHECKSUM
SHORT CIRCUIT
Hz or O.S.
AMP
AMP and (Hz or O.S.)
STOP
Allarm intervention
1
2
t [sec]
LED
LED ON
LED OFF
LED ON
fig.12
