Cortalk RMU5 Generic Installation And Configuration Manual page 40

6. Relay Open Dwell Time. This parameter is used to compensate for mechanical relays which have a lag time when
transitioning from a closed to an open state. The parameter can be set from 0 to 255ms. Use of this parameter only
applies to units equipped with the GPS timing control module board.
7. Relay Close Dwell Time. This parameter is used to compensate for mechanical relays which have a lag time when
transitioning from an open to a closed state. The parameter can be set from 0 to 255ms. Use of this parameter only
applies to units equipped with the GPS timing control module board.
8. Sync to AC Line. To minimize surge current at rectifier turn on, the relay drive signal may be synchronized to the
AC waveform. Enabling this checkbox engages this functionality. Note that the relay drive signal will vary by up
to 10 milliseconds from where it would normally occur. Use of this parameter only applies to units equipped with
the GPS timing control module board.
9. Relay is ON First Part of Cycle. The start of an interruption cycle is synchronized with the top of the minute. This
setting allows the first part of the cycle to have the rectifier enabled, followed by the off portion of the cycle.
Normally, the off portion is first in the cycle. Use of this parameter only applies to units equipped with the GPS
timing control module board.
10. Relay is Normally Closed. Relays are available with normally open or normally closed contacts. For a solid state
relay, the contacts are usually normally open meaning that power has to be applied to the coil input on the relay to
close the contacts. In the case of a mechanical relay, either normally open or normally closed contacts are available.
For a mechanical relay though, it is usually preferred to use a normally closed relay to save power, as the relay coil
does not have to be energized to maintain the contacts in a closed state. Set this field according to the type of relay
that is used in the rectifier.
11. Daily Repeat. An interruption event (whether it be immediate or scheduled to happen at a later date/time) may be
set to repeat daily for a set number of days by setting this parameter to the number of additional days to repeat.
When daily repeat is used, the duration parameter must be less than 24 hours (1440 minutes).
12. MODBUS Register. This parameter specifies the base register address for the interrupter control register block.
Each field on this page has a number associated with it which is added to this base address to determine the register
address for an individual control/status field.
13. Schedules On Time. The RMU5 may be programmed with a specific date and time and the interruption output will
operate in a cycling mode for the specified duration. This date and time may be enabled by selecting the enable
check box.
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TITLE:
RMU5 Generic Installation and Configuration Guide
DOCUMENT NO.: SHEET:
RMU5-MAN-001
REV:
40 of 69 1.10