Technical data

33-38
For more information contact Cutler-Hammer at: www.ch.cutler-hammer.com/catalog CAT.201.01.T.E
January 2001
NEMA Contactors & Starters
33
Current Sensing Protective Relay
Freedom Line
Vol. 2, Ref. No. [0054]
Contents
Description Page
Current Sensing Protective
Relay
Product Description. . . . . . . 33-38
Features . . . . . . . . . . . . . . . . 33-38
Benefits. . . . . . . . . . . . . . . . . 33-38
Standards and
Certifications . . . . . . . . . . . 33-38
Dimensions . . . . . . . . . . . . . 33-39
Product Selection . . . . . . . . 33-39
Product Description
The IQ500 is a heaterless, current-
sensing, solid-state motor protective
relay with optional communications
capabilities. Several functions are
incorporated into the base relay
(IQ502/IQ504) as standard:
■ Overload (overcurrent) protection
■ Phase unbalance and phase loss
protection
■ Ground current protection (Class II)
The base relay can serve as the initial
building block for a motor protection
system by adding the IQ500M Special
Function Module. The module can
address application related motor load
functions with the additional features:
■ Underload protection
■ Long acceleration
■ Jam protection
■ Load control
The IQ500 can provide a cost-effective
alternative to conventional protective
relays such as current relays, ground
fault relays and phase loss or phase
unbalance relays. Used with the
PowerNet system, a low-cost, local
area communication network,
information such as current values,
status, setpoint values and cause of
trip can be displayed remotely. The
IQ500 relay is ideal for a variety of
industrial applications such as mining,
timber, material handling, air
conditioning compressors, wastewater
treatment plants and petrochemical
industries.
Features
■ Overload class is adjustable using
DIP switches for 5, 10, 20 or 30
seconds, maximum trip times at six
times rated current
■ Designed for 1000V and less
distribution systems
■ Form C (NO/NC) contact on output
relay
■ Isolated alarm relay output contact
■ Communications capability using
IMPACC network
■ Manual or automatic reset (either a
true manual or remote electrical
reset) — selectable
■ Overload, Class II ground current,
phase unbalance and single-phase
protection are standard
■ LED indication (bi-colored — red/
green) for device status, including
overload, phase unbalance or
ground current trip
■ Special Function Module adds
protection for underload and jam
conditions, also provides for long
acceleration
■ Optional load control feature avail-
able with special function module
■ Feed-through current transformer
windows for contactors, NEMA
Sizes 1 – 4 (for Size 5 and larger,
external current transformers can
be used)
■ Fits mounting footprint of Cutler-
Hammer MORA relay
■ Panel or starter mountable
■ Cause of trip is held in memory
through a power loss
■ Bell alarm contact available for
remote status indication
■ DIP switch provided for setting
operating frequency — 50 or 60 Hz
■ Plug-in terminal block for control
power, trip relay and bell alarm
relay connections
■ Operating temperature: -20° to 60°C
(-4° to 140°F)
Benefits
■ No external current transformers
are required since they are internal
to the IQ500.
■ DIP switches used to select func-
tions and settings on base relay are
clearly marked and covered with
screw-on plastic covers.
■ On the automatic reset, the reset
times can be selected for long
(90 second) or short (10 second)
delay.
■ Device can be set for different motor
full load currents without additional
parts or modules.
Optional Benefits
■ With the addition of the IQ500M
Special Function Module, the
enhanced protection includes jam
(overtorque) and underload and
provides long acceleration time
(high inertia load).
■ The underload and jam protection
functions each have independent
Form C output relays as part of the
module. In addition, the underload
and jam functions each have their
own LEDs for status indication.
■ The underload and jam functions
also have separate selectable trip
levels and adjustable trip-delay and
start-delay settings.
■ The IQ500M can be used as a load
control module that allows “shed-
ding and restoring” a particular load
that contributes to the load being
monitored.
■ The PONI (Product Operated Net-
work Interface) card attaches
directly to the base relay or special
function module for interfacing with
the Cutler-Hammer PowerNet com-
munications system.
■ Localized display can be achieved
with the Central Monitoring Unit.
Standards and Certifications
■ UL File No. E19223
Catalog Number IQ502A
Tab3301.fm Page 38 Monday, October 23, 2000 9:49 PM