Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 61
Both Alarm and Trip statuses are the outputs from the Configuration Matrix and they can
be monitored using the CMT1000 and Remote Access. Alarm and Trip Status can be
configured as digital outputs (DO), however as shown in Figure 3-11, they are not directly
connected to the output. Instead they are connected to the Standby Configuration boxes.
The Standby Configuration boxes, shown in Figure 3-11, prevent Alarm and Trip to
output their status values to the DO port during Standby mode; and this function can be
used to prevent undesired alarms as long as the Channel is in Standby. When the
Standby Configuration blocks the status of Alarm and/or Trip, the value transferred to the
DO port is logical zero.
A list with all the DCH monitoring functions (12) is shown in Table 3-1. Following, Table
3-2 shows the 5 status signals from other UN1020 functions which can also be
configured with the Configuration Matrix.
Table 3-1 Double Channel Supervision functions.
The SW is not running within time frames or the real-time
system
Failure condition: Controller overload
On CMT1000: "Loss of
Remote Control".
Supervision of MODBUS keep alive Remote Access
feature. Active independent of “remote access” is granted.
Supervision function is only reset in case new
communication is established by toggling the keep-alive bit.
Machine Voltage
One or Two phases lost
On CMT1000:
"Partial Loss of UM"
Machine PT monitoring function for 3-phase system only.
Failure condition: Error is detected if U0 sum is over 70%
of Unom.
Loss of all phases
On CMT1000:
"Loss of UM"
Machine PT monitoring function. The function is activated
only after the Soft start is finished.
Failure condition: Excitation current is higher than 80% of
No-Load and Machine Voltage falls below 10%. Monitor
function is triggered only when no short-circuit condition is
detected.
Short circuit is detected when voltage falls below 10% and
machine current jumps up more than 100% within 50ms.
The monitor functions can only be reset in case UM>15%
and Ie>50% of No Load
Machine current monitor
On CMT100:
“Loss of CT”
Machine CT monitoring function
Failure condition: Machine current is below 2% and
machine voltage is between 90% and 110% and excitation
current is out of the range of 50% to 150% of noload
excitation current.
The supervision function is blocked in Standby mode.
Machine Voltage Freeze
monitoring
Phase L1
Phase L2
Phase L3
On CMT100:
“UMLx Freeze”
Monitoring of the electronics for the Machine 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.
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