ABB UNITROL 1020 - Page 70

Chapter 3 - Device Overview 
62 3BHS335648 E82 UNITROL 1020 User Manual
Supervision
Function
Description
Detection
Time
Network Freeze
monitoring
On CMT100:
“Unet Freeze”
Monitoring of the electronics for the Network voltage
measurement components on the PCB (this is not a PT
monitoring function).
Failure condition: The voltage measurement is more than
10%, constant and not alternating.
60 msec.
Machine Current Freeze
monitoring
On CMT1000:
"IM2 Freeze"
Monitoring of the electronics for the Machine current
measurement components on the PCB (this is not a CT
monitoring function).
Failure condition: The current measurement is more than
10%, constant and not alternating.
60 msec.
Loss of control
On CMT1000:
"Loss of control”"
Supervision of PWM control
Failure condition: Excitation is On, PWM stays below
12.5% of 1/Kceiling and excitation current is above 250%
compared to No Load condition.
Function is blocked when “Voltage Relay” is active
500 msec.
Loss of Excitation
On CMT1000:
"Loss of Excitation”"
Supervision of Excitation current
Failure condition: Excitation current is less than 50% of
the specified value of No-Load condition or Upwr is less
than 10V and PWM is above 2/Kceiling.
(Ie < 50% OR Upwr < 10V) AND PWM > 2/Kceiling
This function is disabled in standby mode.
Function is blocked when “Voltage Relay” is active or at
switchover (standby channel becomes active) for 5 sec.
The time blocking can be disabled in the expert window.
500 msec.
Temperature
Level 1
On CMT1000:
"Temperature Limit 70°C”"
Supervision of controller temperature
Failure condition: Temperature is equal to or above 70
ºC.
2 sec.
Temperature
Level 2
On CMT1000:
"Temperature Limit 85°C”"
Supervision of controller temperature
Failure condition: Temperature is equal to or above 85
ºC.
2 sec.
External Alarm
On CMT1000:
“External Alarm”
Supervision of external digital input signal (must be
assigned in the digital input section).
Failure condition: The digital input value is copied to the
status of this function.
100 msec.
RS 485 communication
monitor
On CMT1000:
“RS485 Bad Frames”
Communication supervision based on bad frames rates
Failure condition:
Modbus: 10 bad frames in 10 sec
VDC: 10 bad frames in 2 sec
10 / 2 sec
VDC breaker error
On CMT1000:
“VDC Breaker Status Error ”
Mismatch of breaker detection for busbar configuration or
in the same section for VDC ring configuration
Failure condition: The same breaker will show up with a
different status
1 sec