Utility Relay Company AC-PRO-II, Instruction Manual

Page: 20 / 56

AC-PRO-II
®
Instruction Manual www.utilityrelay.com
Page 18
on back of
Plug into
QT Switch
"QUICK-TRIP
Plug into Jack
with QUICK-TRIP turned ON
Red LED is "ON"
Connector"
AC-PRO-II
Push
To
Verify
Quick-Trip ON
Quick-Trip OFF
Quick-Trip ON
Quick-Trip Switch
Arc Flash Hazard Reduction Switch
R
TM
(only for use with AC-PRO-II trip unit)
Lockable Guard
Note: QUICK-TRIP Switch
cable
4/C QUICK-TRIP
is not shown
Optional Customer
Wiring & Devices
Remote ON/OFF
Switch
Remote
Indication
120VAC 0.5A
Terminals on back of
AC-PRO-II QT Switch
Closes if QT Switch is on
ON position or if 120V
applied to Remote
switch terminals
/- 15%
120VAC
L
N
L
N
USB
AC-PRO-II
COMM
OK
PICKUP
DISPLAY
Figure 7.1: QUICK-TRIP System and Connections
The QUICK-TRIP system is a manually controlled arc flash
hazard reduction system. It can reduce trip times when
turned on and allows selective coordination between circuit
breakers when turned off.
If maintenance personnel must work on energized
equipment, they will first turn the QUICK-TRIP system on at
the upstream breaker feeding the equipment or breaker. If a
fault now occurs, the upstream breaker will trip quickly based
on the QUICK-TRIP settings
reducing the Arc Flash
Hazard to personnel.
When the maintenance work is finished, the QUICK-TRIP
system is turned off and the original selective coordination is
back in effect.
The QUICK-TRIP system consists of the following
components:
1) AC-PRO-II trip unit.
2) AC-PRO-II QUICK TRIP Switch:
(URC Part #QT2-SWITCH) consisting of Padlockable
QUICK-TRIP On/Off toggle switch, QUICK-TRIP On
LED, Push-to-Verify button, Remote Switch Terminals,
and Remote Indication Terminals.
3) 4/C QUICK-TRIP cable with connectors.
When QUICK-TRIP is
on , the following settings are enabled:
•
I QUICK-TRIP (I QT)
•
GF QUICK-TRIP (GF QT)
These are standard AC-PRO-II settings. All other settings
remain in effect. Refer to Section 6.2.
The “QUICK-TRIP ON LED” provides positive indication that
the QUICK-TRIP settings are active if the LED is on.
If the AC-PRO-II is not powered up (by current, voltage
(VDM), USB or 24VDC Aux.), the QUICK-TRIP Switch
“Push-to-Verify” button is available. Pressing this button will
“wake up” the trip unit using the AC-PRO-II battery, and the
QUICK-TRIP ON LED will illuminate, providing positive
indication that the QUICK-TRIP switch or remote
QUICK-TRIP switch is in the ON position.
7.0 QUICK-TRIP
®
System (optional)
7.1 QUICK-TRIP
®
Basics & Operation
**** NOTE ****
QUICK-TRIP Instantaneous and QUICK-TRIP Ground
Fault features can be activated only if the AC-PRO-II is
installed with (connected to) an AC-PRO-II
QUICK-TRIP switch.
**** IMPORTANT ****
A qualified engineer must determine the QUICK-TRIP
settings, calculate the incident energy levels and
determine the Hazard Risk Categories (HRC).