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inductive device (relay, contactor is supplying these
contacts, the coil of the device must be suppressed with
a user supplied YORK P/N 031-00808 suppressor.
NOTE: REMOTE SETPOINT RESET will not operate
when a Remote Control Center Option Kit is
connected to the Micropanel. The Remote
Control Center will always determine the
setpoint.
REMOTE % CURRENT LIMIT SETPOINT RESET
Remote Current Reset allows resetting the % Current
Limit downward from the programmed value in memory.
This can be use for demand limiting, etc. Current Reset
accomplished by connecting a "dry" contact between
terminals 13 & 16. See Fig. 19 for the location of these
terminals. Closing the contact for a defined period of time
allows reset of the % Current Limit downward.
Contact closure of 1 - 18 sec will allow % Current Limiting
to be adjusted downward from 115% by a maximum of
85%. This will allow current limiting to a minimum value
of 30% FLA (115%-85% = 30%).
The Current Limiting will operate independently of the
Programmable Current Limiting (See Average Current
Unload, Page 90). The micro will always look at the two
Current Limit Setpointsand choose the lower of the two as
the controlling value, whenever Remote Current Limiting
is utilized.
Contact closures of less than 1 second will be ignored. A
closure of 18 seconds is the maximum allowable closure
and provides a Current Limit reduction of 85%.
The required contact closure can be computed by
following the 4 steps beow:
1. Choose the % FLA desired for the Current Limit % FLA,
after offset.
2. Subtract the desired Current Limit % FLA from 115%
to calculate the required offset %. See the formula
below:
Offset % = 115% - Desired Current Limit % FLA
3. Convert the offset % to a decimal equivalent by
dividing by 100%. This will compute the offset. See the
formula below:
Offset %
Offset
=
100%
4. Calculate the Pulse Width (PW) in seconds required by
utilizing the following formula:
PW seconds = (Offset x 20) + 1
130
Show below is an example where 75% FLA is Desired
Current Limit %:
1. 75% is the chosen Current Limit % FLA after offset.
2. Offset % = 115% - 75% = 40%
3. Offset
=
40%
=
100%
4. PW = (.40 x 20) + 1 = 9 seconds
NOTE: The lowest Current Limit % FLA as dictated by
the Remote Current Limit Reset (EMS Current
Limiting), or ISN Current Limiting.
Whenever current is being limited by a remote reset
signal, the following STATUS message will appear:
S Y S
1
E M S
S Y S
2
E M S
Wiring from remote contacts should not exceed 25 ft. and
should be run in grounded conduit that does not carry any
wiring other than control wiring. Additionally, if an
inductive relay contactor is supplying these contacts, the
coil of the device must be suppressed with a user supplied
YORK P/N 031-00808 suppressor.
NOTE: Remote EMS Reset will not operate when a
Remote Control Center Option Kit is connected
to the micropanel. The Remote Control Center
will always determine the setpoint.
To maintain a given offset, the micro must be refreshed
every 30 seconds - 30 minutes with a contact closure of
the required time period. It will not accept a refresh sooner
than 30 seconds after the end of the last PWM signal, but
must be refreshed before a period of 30 minutes expires
from the end of the last PWM signal.
After 30 minutes, if no refresh is provided, the setpoint will
change back to its original value. A refresh is nothing
more than a contact closure for the period required for the
desired offset.
NOTE: After an offset signal, the new REM SETPOINT
may be viewed on the REMOTE EMS LIMITING
DISPLAY. However, if this display is being
viewed when the reset pulse occurs, the setpoint
will not change on the display. To view the new
offset, first press any other display key on the
keypad and then press the REMOTE EMS
LIMITING RANGE key. The new setpoint will
then appear.
.40
L I M I T I N G
L I M I T I N G
YORK INTERNATIONAL
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