Littelfuse 77C-LR-KW/HP Pump Monitor Product Description
The 77C-KW/HP and 77C-LR-KW/HP are fully programmable
pump protection relays which will monitor the voltage and
current for high or low voltage, overload and underload
conditions based on power, in one package. The underpower trip
feature is desirable anytime the current vs.load characteristic is
non-linear or has little change. In general terms, smaller motors
and slow-speed motors have little change in current over the
normal load range. Larger motors that are running light loads will
also show small current changes over the operating load range.
Common uses include pumping applications where motors run
slower than around 3400 rpm and usually have small current vs
load changes; such as slow speed mixer or agitator motors up to
50 hp, and magdrive or can pumps. The Littelfuse PumpSaver® relay provides the high sensivity of a power monitor to protect pump motors from dry run and deadhead conditions.
Small motors, those under 3 hp and especially fractional horsepower,
exhibit small changes in current vs. load, but the change in power is
large. When larger motors are derated (run below their rated horsepower)
the change in current is small vs. load, but again, the change in power is
large and linear. Other typical applications include slower speed mixer or
agitator motors up to 50 hp and beyond. These motors and others that run
slower than around 3400 rpm usually have small current changes vs. load.
The 77C-LR-KW/HP Provides 480 VA @ 240 V ac output SPDT (Form C) relay contacts.
Littelfuse 77C-LR-KW/HP Pump Monitor Typical Application
- Conveyor Systems
- HVAC Equipment
- Saws and Grinders
- Fan Motors
- All Pumping Applications With Single-Phase Electric Motors
Littelfuse 77C-LR-KW/HP Pump Monitor Technical Details
- Protects Single-Phase motors from:
- Overload
- Underload
- Jams
- Low Voltage
- High Voltage
- Rapid Cycling
- Fully Programmable
- Automatic Reset With Three Separate Restart Delay Timers, or Manual
Rreset
- Tamper Guard
- RS-485 Communications Port (Communications Module Sold Separately)
- 3-digit LED Diagnostic Display
- Remote Reset
- Last Fault Memory
- UL and cUL Listed
- CE Ccompliant
- CSA Approved
- Surface or DIN Rail Mount
- 5-year Warranty
- Made in USA
Littelfuse 77C-LR-KW/HP Pump Monitor Specifications
Input Voltage
. . .
. . . . . . . . . . . . . . . . . . 100-240 VAC, 1Ø
Frequency . . . . . . . . . . . . . . . . . . . . 50/60Hz
Motor Full Load Amps
- . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25 Amps, 3Ø(Loops Required)
- . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26-90 Amps, 3Ø(Direct)
- . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91-800 Amps, 3Ø(External CT’s)
Short Circuit Withstand Rating . . . . . . . . . . . 100kA per UL and CSA
Power Consumption . . . . . . . . . . .5W (Maximum)
Output Contact Rating
- SPDT-Form C . . . . . . . . . . . . . . . .480VA @ 240VAC Pilot Duty
- . . . . . . . . . . . . . . . . . . . . 10A @ 240VAC General Purpose
Expected Life
- Mechanical . . . . . . . . . . . . . . . . .1 x 106
operations
- Electrical . . . . . . . . . . . . . . . . .1 x 105
operations at rated load
Accuracy at 25° C (77° F)
- Voltage. . . . . . . . . . . . . . . . . . . . . . . . ±1%
- Current . . . . . . . . . . . . . . . . . ±3% (Direct, No External CT’s)
- Timing . . . . . . . . . . . . . . . . 5% ± 1 second
Repeatability
- Voltage. . . . . . . . . . . . . . . . . . . . . . . . ±0.5% of nominal voltage
- Current . . . . . . . . . . . . . . . . . . . . . . ± 1% (Direct, No External CT’s)
Safety Marks
- UL . . . . . . . . . UL508, UL1053
- CE. . . . . . .IEC 60947-1, IEC 60947-5-1
Electorstatic Discharge (ESD) . . . . . . . . . IEC 61000-4-2, Level 3, 6kV contact, 8kV air
Radio Frequency Immunity (RFI), Conducted . . . . . . . . .IEC 61000-4-6, Level 3 10V/m
Radio Frequency Immunity (RFI), Radiated . . . . . . . . .IEC 61000-4-3, Level 3 10V/m
Fast Transient Burst . . . . . . . . .IEC 61000-4-4, Level 3, 3.5kV input power
Surge
- IEC . . . . . . . . . 1000-4-5, Level 3, 2kV line-to-line; Level 4
Terminal Torque . . . . . . . . . . . . . . . . . . 7 in.-lbs
Enclosure Material . . . . . . . . . polycarbonate
Weight . . . . . . . . . . . . . . . . . . . . . . . . 1.2 lbs<
Temperature Range
- Ambient Operating . . . . . . . . . -20° - 70° C (-40° - 158°F)
- Ambient Storage . . . . . . . -40° - 80° C (-40° - 176°F)
Class of Protection . . . . . . . . . . . . . . . . . . . . IP20, NEMA 1
Relative Humidity . . . . . . . . . . . . . . . . . . . . . 10-95%, non-condensing per IEC 68-2-3
Programable Operating Points
- LV-Low Voltage Threshold . . . . . . . . . 85V - HV Setting
- HV-High Voltage Threshold . . . . . . . LV Setting - 264V
- MULT-# of Conductors or CT Ratio (XXX:5) . . . . . . . 1-10 Conductors or 100-800 Ratio
- OC-Overcurrent Threshold . . . . . . .(20-100A) ÷ MULT or 80-120% of CT Primary
- CUB-Current Unbalance Threshold . . . . . . .2 - 25% or 999
- TC-Overcurrent Trip Class*> . . . . . . . 5, J5, 10, J10, 15, J15, 20, J20, 30, J30, or LIn (linear)
* If J Prefix is displayed in trip class setting, jam protection is enabled. If programmed to Lin position, overcurrent trip delays are fixed linear-type delays set in OPT1 position
WARNING:
Cancer and Reproductive Harm - www.P65Warnings.ca.gov
SymCom Warranty
SymCom Limited Warranty
Terms and Conditions of Sale
Effective January 1, 2009 General Remarks: These Terms and Conditions of Sale apply to all sales and deliveries effected by SymCom. Any terms or conditions on the part of the purchaser that are contrary to these shall not be binding on SymCom, even if they form the basis of the order. Prices: Subject to change without notice. Minimum order is one hundred-fifty dollars ($150.00), excluding shipping charges. Terms: Net 30 days from ship date with approved credit. New customers requesting trade credit must submit a credit application prior, and receive approval prior to an order being placed in production. Handling Fee: A $5.00 handling fee will be assessed on each order. Delivery: Buyer's delivery schedule will be met to the best of SymCom's ability. SymCom reserves the right to make partial shipments on any order. SymCom is not responsible for shipping errors on behalf of the carrier. Freight: All sales are F.O.B., SymCom, Inc., Rapid City, SD. Shipments will be made by the transportation method selected by the Buyer whenever practical. Warranty: SymCom warrants its standard products against defects in material or workmanship for a period of five (5) years from the date of manufacture. All third-party products are warranted by their manufacturer and are handled as a pass-through warranty by SymCom. All custom and private labeled products are warranted for eighteen (18) months unless otherwise stated in writing. The liability of SymCom is limited, at its option, to replace, repair, or credit at the purchase price, for any devices which are returned during the warranty period and which prove to be defective. This warranty constitutes SymCom's sole liability here under and is in lieu of any other warranty expressed, implied or statutory, written or oral, including without limitation, any implied warranties of merchantability or fitness for a particular purpose and supersedes any representations made by any person which are inconsistent with or expand the terms set forth in this document. No person is authorized to modify this warranty in any way whatsoever. Limits of Liability: IN NO EVENT, REGARDLESS OF CAUSE, SHALL SYMCOM BE LIABLE FOR (1) PENALTIES OR PENALTY CAUSES OF ANY DESCRIPTION OR (2) FOR CERTIFICATION NOT OTHERWISE SPECIFICALLY PROVIDED HEREIN AND/OR INDEMNIFICATION OF BUYER TO OTHERS FOR COSTS, DAMAGES OR EXPENSES, EACH ARISING OUT OF OR RELATED TO THE PRODUCT OR SERVICES OF ANY ORDER OR (3) FOR ANY DAMAGES, WHETHER GENERAL, SPECIAL, OR FOR NEGLIGENCE, AND EXPRESSLY EXCLUDES DAMAGES RESULTING FROM LOSS OF PROFITS, USE OF PRODUCTS, ANY INCIDENTAL, OR INDIRECT CONSEQUENTIAL DAMAGES EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SYMCOM'S OBLIGATION TO REPAIR, REPLACE OR CREDIT THE PURCHASE PRICE SHALL BE THE LIMIT OF ITS LIABILITY UNDER THIS WARRANTY. Returns: All returns must be authorized by SymCom and must have a Return Material Authorization (RMA) number. Issuance of a RMA number does not acknowledge goods as defective or under warranty by the seller. Unauthorized returns will be refused. Authorized returns must be shipped freight prepaid and are subject to inspection and/or testing prior to disposition. Product built to Buyer's specifications cannot be returned for credit or exchanged under any circumstances. For SymCom’s complete RMA terms, please visit our website. Cancellation of Custom or Non-Preferred Products: Buyer may cancel an order upon written notice to SymCom's customer service department and upon payment of cancellation charges, which shall include all costs, both direct and indirect, incurred and/or committed. SymCom agrees to divert completed work and work in progress from a cancelled order to other orders whenever possible. Cancellation of Preferred Products: Full refund if returned within 30 days of purchase. Unit must be in original packaging and in new condition. An RMA must be issued for any return.