SymCom 777 Installation Instructions Manual page 5

RD1 - 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 - 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 - 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 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 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 - #RF 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 - 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.
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