Crompton Controls M20 - Manual (Page 55)

Emotron AB 01-4481-01r1 2
the reset button or by the digital input. When reset, the
monitor can once again perform the number of reverse
cycles set in window 36.
Reset of the monitor can be done in three ways:
• Reset button
• Digital input, set for “rES”, window 81
• Switch-off the supply voltage, 3-phase.
Important! If the monitor senses an overload during reversal,
after start and response delay has elapsed, the motor will be
stopped immediately even if the reversal time is set for a
longer time. The monitor will then try to run in the forward
direction again. If the load returns to a normal running level
before the start delay has elapsed (i.e. the jammed material
clears), the monitor will reverse the motor/feeder until the
selected time has concluded.
If the reversal time is set to a shorter time period than the
start and response delay together, the reverse mode will be
completed after the selected reverse time has concluded,
independently of the set response delay. In this case the
response delay only has an effect on forward running.
When the conveyor has fed forward for at least 60 seconds
with normal conditions and no alarm, the previous number
of start attempts (reverse cycles) are reset automatically
although only if selected start and response delay time has
concluded.
Fig. 1 Example of connection with a forward and reversing
motor starter (contactor).
S1 S2
L2
L3
L1 C
R2
R1
A- A+
M20
L3
L2
L1
}
5
8
7
6
2 1
13
11
9 4 3
K1
U V W
M
K2 K1 K2 Reset
CTMxxx
DIG
FWD REV
Alarm/Stop
20 mA
(Blocking)
Max 240 VAC (alt. 0 VDC-)
N (alt. 48 VDC+)
Window Function Range
35 Reverse time 3-90 s
36 Start attempts 0-5
65 Relay function 2=reverse