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5 -
1/05
RD1
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RD1 (restart delay one) is the rapid-cycle timer in seconds. This timer is initiated when
power is first applied to the unit. If voltages are within the programmed limits and no SP
(single-phase) or RP (reverse-phase) condition exists when power is applied to the
device, the output relay will energize (the NO will close and the NC will open) as soon as
RD1 expires). Typically, this is set to 20-30 seconds. This will provide adequate protection
for successive power outages or short cycling caused by other motor controls. This timer
is also initiated when another control shuts the motor off (current goes to zero). If the user
does not want the unit’s relay to de-energize when another control shuts the motor off,
then RD1 should be set to zero. This will also ensure that when an alarm circuit is used,
an alarm will sound only when there is a true problem or when power is lost.
RD2
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RD2 (restart delay two) is the restart timer, in minutes, used when the unit has shut off
due to a current unbalance, current single phasing, or an overload condition. This timer is
known as a motor cool-down timer. A setting of 5-10 minutes will give most motors
adequate time to cool down after an overload condition. The motor manufacturer should
be contacted for an exact value.
RD3
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RD3 (restart delay three) is the restart timer, in minutes, used after an undercurrent trip. It
is also known as a dry-well recovery timer in pumping applications. This would be the time
it takes a well to recharge after pumping dry. This setting varies widely from application to
application and there is no typical setting.
#RU/ADDR
- The #RU/ADDR is a dual function setting. The #RU settings cover from the 7 o’clock
position to the 11 o’clock position. ADDR settings start after the 11 o’clock position.
#RU (# of restarts after an undercurrent) is the number of restarts after an undercurrent
trip condition before the unit locks and requires a manual restart. This counter will be
cleared one minute after start-up if the unit does not trip again on UC. #RU can be set to
0, 1, 2, 3, 4, or A. A setting of zero means no automatic restarts after an undercurrent. A
setting of “A” means the unit will always automatically restart after an undercurrent.
ADDR (address) is the RS-485 address of the particular device. This is only used when
communicating with an RM-2000 (set ADDR=A01), a PLC, or PC. The ADDR can be
programmed from A01-A99.
#RF
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#RF (# of restarts after a fault) is the number of restarts allowed after a current unbalance,
current single phasing, or an overload condition. A setting, which includes an “oc” prefix,
will include overcurrent in the number of successive restarts. If “oc” is not a prefix to the
programmed setting, the unit will require a manual restart after an overcurrent. A setting of
zero means the unit will not try to restart after a CUB, OC, or SP. A setting of “ocA” means
the unit will always try to restart after a CUB, OC, or SP.
UCTD
- UCTD (undercurrent trip delay) is the amount of time, in seconds, the unit will allow the
motor to run in an undercurrent situation before de-energizing its relay. Typically, UCTD is
set to 2-4 seconds.
GF
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GF (ground fault) is the maximum allowable current, which can flow to ground before the
unit de-energizes its relay. This is a residual, class II ground fault system and should not
be used for personnel safety. A typical setting for this is 10%-20% of the motor full load
current. The real GF current level is programmed into the unit. The GF test procedure on
the last page of the installation instructions must be conducted before the device is
brought online.