MC1 V3 Installation & Programming page 8 / 9
A minimum threshold of 0 is special. The minimum load sense is not checked. This is useful if the unit is driving a very small
load such as relays that are switching power to a large motor. Zero may be set by C18 O10 or by nudging the threshold down
to 0.
To set the unit to stop when the motor just stalls, measure the current the motor draws while running or read the number off
the motor rating label. Enter that into the stall threshold. Run the motor to the stall point and verify that the RP relays shut off
¼ second after the motor stalls. If the RP does not shut off, then the stall value is too high. Press stop then set the threshold
lower or nudge it down a few times (C19 O12 O12 O12). Repeat the stall test until the RP shuts off appropriately. Verify that
the motor runs correctly from limit to limit without stopping somewhere in the middle. If the motor stops in the middle, then
the stall threshold is too sensitive, nudge it up once (C19 O11), then re-verify operation. Do not let the motor get very hot
during this operation.
If the stall level is set too low, then the motor will only run briefly, then it will only run the other way briefly, because the RP
believes it is at the limit when it detects a stall.
Once the motor has started, the current must fall below and stay below the “minimum load threshold” for ½ second for the RP
to determine that the motor has reached its limit. This time is not adjustable. Stall sensing requires the motor current to
exceed and stay above the “stall load threshold” for ¼ second before power is removed. This time is not adjustable.
“Specific Stop”:
Set “Specific Stop” Channel (C22 O“N”) allows you to specifically stop this motor with a bus command. This feature allows
the home automation programmer to have a specific stop command for a motor. Open or Close command on this channel will
stop this motor if running and will not cause motion if already stopped. This is useful mainly from an IR command
perspective. If the automator is using serial commands, then specific stop is supported by the “s” command channel without
having to use a channel for the feature.
Deadbeat:
If deadbeat is enabled, the MC1 will count full open and close events (the LED will blink on briefly when the count happens).
When the count exceeds the selected value (depends on Demo) then the MC1 will no longer open or go to an intermediate
stop, or act on an “M” serial command. If Deadbeat has counted out, then the “M” command is simply ignored.
New to V3:
Motor Direction may be “Toggled” by pressing stop (with the motor already stopped) and holding it for 5 seconds which will
cause the LED to come on. Release stop, then press and release Open1 within 2 seconds (the LED will go out then blink) and
the motor leads will be swapped. If any other button, or no button is pressed within the given time, the LED will just go out
and nothing is changed. While STOP is pushed, manual inputs are ignored.
Shorting the corner processor pins opposite the divot, near the letters J3 will force program mode. Be very careful doing this.
Support for the 0 0 0 button time as described in the protocol.
Selection of verbose or limited feedback as described in the protocol. This provides better support for multiple units on one
serial link. Default is verbose (like it was in v2).
Default minimum load is 0 – see section on calibration and load sensing.
(124 Seiten)
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