ABB UNITROL 1020 - Page 71

 Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 63
Supervision
Function
Description
Detection
Time
Internal Power supply
monitor
On CMT1000:
“Internal Power Fail”
Supervision of all internal power supply
Failure conditions: According to HW design
10 msec
Digital output supervision
on CMT1000:
“Digital Output Fail”
Digital output and 24 V power supply supervision
Failure condition: Digital output current per pin exceeded
500 mA or 24 V output voltage goes below 12 V dc
10 msec
CAN communication
supervision
on CMT1000:
“CAN Monitor”
Supervision of communication in case a double channel
setup is used. The following conditions must be fulfilled in
order that supervision is active:
- Double channel communication must be enabled
(checkbox in monitor and protection window)
- SWO Startup Hold time must be >0
The supervision becomes active after the startup hold time
is expired and no data can be sent / received any more.
1 sec
Monitor Alarm 1
Configured monitor Alarm 1
Monitor Alarm 2
Configured monitor Alarm 2
Monitor Alarm 3
Configured monitor Alarm 3
DCH Monitor Functions
Table 3-2 Monitor function statuses that can be configured with the Configuration Matrix.
Monitor Functions
Description
Detection
Time
FCB Alarm
Supervision of Field Circuit Breaker.
1 sec.
Diode Alarm
Rotating diode monitoring alarm.
Requires RDM software (optional).
configurable
Diode Trip
Supervision of diode monitoring trip status.
Requires RDM software (optional).
configurable
Generator Overvoltage
Configurable overvoltage monitor
configurable
Generator Undervoltage
Configurable undervoltage monitor
Will be activated after soft start is finished
configurable
Excitation Overcurrent
Configurable overcurrent monitor
configurable
Excitation Overvoltage
Configurable overvoltage monitor
configurable
Upwr Overvoltage
Configurable overvoltage monitor of excitation power
configurable
External Alarm
Supervision of external digital input signal (must be
assigned in the digital input section).
100 msec.
Emergency Exc. OFF
Emergency Exc. Off Command latch
5 msec.
Reverse Power
Supervision of relative power (Prel)
Negative threshold is used for generator mode
Positive threshold is used for motor operation
Configurable
GCB Alarm
Alarm is triggered in case GCB cannot be closed by the
close command within 2 sec or machine current exceeds
20% with open GCB status
2 sec
AVR output SC
AVR output short-circuit detection
10 ms
Limiter Monitor 1
Sum of configurable Limiter status
(Configurable in ‘Limiter Monitor’ Window)
na
Limiter Monitor 2
Sum of configurable Limiter status
(Configurable in ‘Limiter Monitor’ Window)
na