Utility Relay Company AC-PRO-II, Instruction Manual

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AC-PRO-II
®
Instruction Manual www.utilityrelay.com
Page 12
listed in Table 5-A. The reset method for each alarm
condition is also listed in the Table below.
Alarm
Condition
Reset Method
Trip Manual reset
Internal Error Auto reset
Actuator
Open Error
Auto reset
Sluggish
Breaker
Manual reset
UnderVoltage Manual reset
OverVoltage Manual reset
LT Pickup Auto reset
“Manual” = reset by user
“Auto” = trip unit resets when condition no longer present
Table 5-A: Alarm Relay Configuration
The alarms listed as “Manual Reset” can be reset at the
alarm screens or at the manual reset screen. Additionally,
the alarm relay can be manually reset using the “More”
menu. See Section 20.0 for the alarm screens and Section
6.4 for the manual alarm reset screen.
**** NOTE ****
If no other power source is available, the battery is used to
reset the alarm relay. (applies to manual resets only)
The Ground Fault defeat input is used to temporarily disable
Ground Fault protection. Defeating Ground Fault protection
is necessary for some protective schemes, for example
double-ended switchgear that is operated with the tie
breaker closed.
When the Ground Fault defeat input is open, the Ground
Fault protective function will operate normally.
When the Ground Fault defeat input terminals are shorted,
the Ground Fault current (if any) will be calculated and
displayed, however Ground Fault trips will not occur.
Note: If the GF Defeat input is opened during a Ground Fault
event, the Ground Fault protection function will begin
functioning and timing as soon as the Ground Fault Defeat
input is opened.
If a breaker position limit switch was provided by URC with
the breaker retrofit kit, it can be wired to the breaker position
contact “a/b” input for breaker position indication, and also to
allow the patented Sluggish Breaker
®
detection feature to
operate with low or no breaker current. The type of breaker
contact used is configured in the settings menu. The
breaker contact type can be set as 52a (contact normally
open when the breaker is open), or 52b (contact normally
closed when the breaker is open).
The RS-485 communications terminal block on the
AC-PRO-II provides communication using the industry
standard MODBUS RTU protocol through a single shielded
twisted pair cable. Refer to the Communications Section of
this manual for additional information.
The 24VDC auxiliary power port is available for connection
to the following sources:
1) B-292 Secondary Injection Test Set.
2) T-490-ASM 24VDC Power Supply.
3) Customer supplied auxiliary power. See Section 3.4.
The USB Port (mini-USB) on the front of the trip unit is
electrically isolated and available for the following connection
options:
1) Laptop or personal computer with InfoPro-AC software:
a. Download and/or print all data from trip unit,
including settings, trip history, waveforms, etc.
b. Upload of new or modified settings to trip unit
c. Upload of firmware updates.
d. View trip unit currents, voltages, power, alarms,
status, serial number, firmware version, etc.
2) SAFE-T-TRIP remote trip device.
A rubber cover is provided for the USB port.
**** IMPORTANT ****
Replace the USB port cover after use.
If the AC-PRO-II is installed on a breaker where the face of
the trip unit is not concealed by a cubicle door, the USB port
on the face of the trip unit itself can be safely accessed.
If the AC-PRO-II is installed on a breaker concealed behind
a cubicle door, the kit will include a USB extender cable that
mounts flush in the door. This allows the USB port to be
used without opening the door. See Section 5.6.1 for USB
extension cable information.
If AC-PRO-II is installed on a breaker that is located behind
a cubicle door, a USB panel mount extension cable and
legend plate is provided in the retrofit kit. This provides a
permanent USB connection from the AC-PRO-II to a USB
port that is accessible at the cubicle door. The cable (5/C, 6
feet long) features a right angle mini-USB connector for the
AC-PRO-II and a USB port with cover, and a threaded nut
for securing to the cubicle door.
Figure 5.5: USB Extension cable
5.3.2 Ground Fault Defeat Input
5.3.3 URC Breaker Position Switch
5.4 RS-485 Communications Terminal Block
5.5 24VDC Auxiliary Power
5.6 USB Port
5.6.1 USB Extension cable