68 Mentor ll User Guide
www.controltechniques.com Issue Number: 12
0 = sustained overload not detected
1 = sustained overload detected
Indicates that current feedback 05.01 has exceeded the overload
threshold 05.06 for a length of time determined by the overload time
values 05.07 and 05.08 integrated with the magnitude of the overload
(the conventional I x t function).
When the current exceeds the overload threshold, the excess integrates
with time causing the value of the actual overload 05.11 to increase.
Conversely, if the current falls below the threshold during integration, the
value of 05.11 falls towards zero. The rate of integration is set by 05.07
when the current is > threshold, and by 05.08 when the current is <
threshold. The rate of integration is the trip time with full scale overload
(05.01 = 1000). This function imitates the behavior of a thermal relay and
simulates the thermal characteristic of a motor.
0 = healthy (normal)
1=trip
In normal operation of the Drive the watchdog timer is reset periodically
by Processor 1 as a check that the processor and Drive program are
functioning normally. If a reset does not occur before the timer has timed
out the conclusion is either that the processor has failed or that the Drive
program has crashed. The result is immediate controlled shutdown of
the Drive, accompanied by a watchdog fault trip signal.
0 = healthy (normal)
1=trip
0 = healthy (normal)
1=trip
10.21 = 1 indicates trip detected at the motor thermistor input terminal.
trip level 3kΩ
detector reset level 1.8kΩ
0 = healthy (normal)
1=trip
10.22 = 1 indicates thyristor (SCR) stack overtemperature, >100
o
C(on
Drives fitted with a thyristor (SCR) stack heatsink thermistor).
0=speedloopnotsaturated
1 = speed loop saturated
Indicates that the output of the speed loop algorithm, from which the
current demand 04.01 is derived, is at a limit. This may be due to the
application of a current limit or a zero-current clamp, and may occur if
the motor is mechanically stalled.
0 = current demand > 0
1 = current demand = 0
Indicates that the current demand signal is being limited to zero. This
could occur, for example, as a result of a sudden loss of load, the Drive
being in torque control mode with speed over-ride. The speed could
reach the set speed threshold as a consequence, causing the speed
loop to reduce the current demand to zero.
Record of the last-trip code, forming the basis of a trip history.
Record of the trip before that which is saved in 10.25.
Record of the trip before that which is saved in 10.26.
10.18 Sustained overload
RO Bit
ô
0or1
ð
10.19 Processor 1 watchdog
RO Bit
ô
0or1
ð
10.20 Processor 2 watchdog
RO Bit
ô
0or1
ð
10.21 Motor overtemperature
RO Bit
ô
0or1
ð
10.22 Heatsink overtemperature
RO Bit
ô
0or1
ð
10.23 Speed loop saturated
RO Bit
ô
0or1
ð
10.24 Zero current demand
RO Bit
ô
0or1
ð
10.25 Last trip
RO Uni
ô
0~255
ð
10.26 The trip before the last trip (10.25)
RO Uni
ô
0~255
ð
10.27 The trip before 10.26
RO Uni
ô
0~255
ð
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