EFFECTIVE: August 09, 2002 Owner's Manual LOAD LIMITER for ER, NER and SNER SERIES ELECTRIC CHAIN HOIST 1/8 Ton through 5 Ton Capacity WARNING This equipment should not be installed, operated or maintained by any person who has not read and understood all the contents of this manual. Failure to read and comply with the contents of this manual can result in serious bodily injury or death, and/or property damage.
Table of Contents Section 1.0 2.0 3.0 4.0 5.0 6.0 Page Number Important Information and Warnings .................................................................................. 2 1.1 Terms and Summary 1.2 Product Overview Technical Information........................................................................................................... 4 2.1 Product Code 2.2 Specifications 2.3 Dimensions 2.4 Principle of Operation 2.5 Electrical Circuit Installation .....................
1.0 Important Information and Warnings 1.1 Terms and Summary 1.1.1 Definition of Terms This manual provides important information for personnel involved with the installation, operation and maintenance of this product. Although you may be familiar with this or similar equipment, it is strongly recommended that you read this manual before installing, operating or maintaining the product.
1.2 Product Overview The product covered by this manual is Harrington’s Load Limiter (LL) for use with Harrington’s ER/NER and SNER Series of electric chain hoists. The LL is an optional accessory that employs a load sensing device and electric switch. Actuation causes the hoist’s lifting circuit to be disabled, while still allowing the hoist to be used in the lower mode. The purpose of the LL is to protect the hoist from damage associated with lifting loads that exceed the hoist’s capacity.
2.0 Technical Information 2.1 Product Identification Table 2-1 Hoist Capacity Code* Load Limiter Type 001H 003S 01H 03S 005L 05S 003H 03H 005S 05S 010L 010M 10S 010S 015S 15 M 020L 020M 20S 020S 025S 25M 030C 30R 030L 030S 050L 30S 50R *Refer to ER, NER and SNER Owner’s Manual. 2.
2.3 Dimensions 2.3.1 Load Limiter Table 2-2 Load Limiter Dimensions Load Limiter type a b Dimensions c (in) d e Weight (lb) 01H, 03S, 03H 05S 10S 15M 20S 30R 25M 9.7 9.5 0.94 0.83 7.60 0.48 0.43 9.3 9.5 5 50R 0.47 0.51 7.76 0.51 0.51 9.
2.3.2 Hoist Fig. 2-1 Hoist with LL. Comparisons to Standard Model (without Load Limiter) Table 2-3 LL additional weghts. Hoist Capacity CapacityCode* (Tons) Weight Adder (lb) ER ERG ERP ERM Lug suspension Headroom Adder (in) ERM Low head suspension ER 001H 1/8 +18.96 +19.85 003S 1/4 005L 1/4 003H 1/4 005S 1/2 +18.52 +19.62 010L 010M 1 010S +18.52 +18.96 015S 1.5 +20.51 +24.03 020L 020M 2 020S +21.61 +23.59 025S 2.5 030C 3 + 9.92 + 9.92 030L 3 +21.61 +23.59 030S 050S 5 +9.92 +9.
2.4 Principle of Operation Refer to Section 5.0 Parts List for diagram and parts names. When a load is applied between the Plunger and the Casing, the Plunger acts to compress the Belleville Spring. As the spring compresses, the Adjuster mounted on the Plunger Arm moves toward the Switch. If the load is great enough, the spring will compress enough for the Adjuster to actuate the Switch. When the Switch is actuated, it breaks the hoist’s lifting contactor control circuit. 2.
3.0 Installation 3.1 Load Limiter and Suspension Plate 3.1.1 1/8 to 3 Ton ER/NER and SNER except 030C– ER hoists used with MR trolleys standardly use Suspender T to attach the hoist to the trolley. In this case, the low-head LL Assembly replaces suspender T. For all other applications the hoist is suspended by either a Top Hook or Connection Yoke/Suspender. In these cases the LL assembly is installed between the hoist body and suspension components.
1) Remove the split pin, slotted nut and chain pin that connect the Load Chain to the Connection Yoke. 2) Bolt the LL to the Connection Yoke, orienting the LL Case Cover toward the hoist motor. 3) Connect the Load Chain to the LL using the Chain Pin, Slotted Nut and Split Pin. Make sure that the load chain is not twisted.
Fig. 3-3 3.2.2 Install the Load limiter Relay as follows: 1) Refer to Figure 3-4. 2) Loosen and remove the two screws that fasten the Terminal Plate (Fig. No. 11 in Section 10.5 of the ER/NER and SNER Owner’s Manual) to the base plate (Fig. No. 4 of the ER/NER and SNER Owner’s Manual). Remove the Terminal Plate. 3) Insert the Load Limiter Relay into the available slot in the Terminal Plate as shown in Fig. 3-4 and reinstall the Terminal Plate. Fig. 3-4 3.3 Electrical Connections 3.3.
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3.2 Performance Test Confirm via load testing that the LL actuates within approximately +/- 8% of its setting. 4.0 Adjustment 4.1 General: The general sequence for adjusting is to determine the Static Set Load (SSL), then use the SSL to adjust the Load Limiter (LL). 4.2 Determine Static Set Load 4.2.1 General The general formula for determining the SSL is SSL = RC X SP X f Where RC is Rated Capacity of either LL or hoist. (see sections 4.2.2 or 4.2.
4.2.3 After Load Limiter installation: If the LL is to be adjusted after installation on to the hoist, then determine the SSL using f and the hoist’s RC from Table 4-1. Table 4-1 Rated Capacity LL Hoist (lbs.) (Tons) Hoist Capacity Code* Load Limiter Type 001H 01H 99 003S 03S 198 005L 05S 397 003H 03H 198 005S 05S f 1.55 397 1/8 1/4 1/4 1/4 1/2 10S 794 1 1.30 15 M 972 1.5 1.15 20S 1296 2 1.30 025S 030C 030L 030S 25M 30R 1620 3307 2.5 1.25 1.
4.3.8 Replace the casing cover.
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5.0 Parts List 5.
5.2 Assembly Parts List 1/8 Ton - 1 Ton 1.5 Ton - 3 Ton Low Head Suspension 1/8 Ton - 1 Ton 1.
Table 5-2 Parts list ER-B Fig. No. Part Name Qty ER-C 001H 003S 005L 003H 005S 1/8 1/4 1/2 1/4 1/2 ER-D 010M 020M 010S 020L 010L 015S 1 ton 1.
5.3 Load Limiter for ERG 1. ERG hoists with Load Limiter for 1/8 Ton ( except 030C) to 3 ton use the extended hand wheel trolley that has the special Frame G complete set. 2. Load Limiter-equipped ERG hoists for 5 Ton use the standard GT.
6.0 Warranty All products sold by Harrington Hoists, Inc.
www.harringtonhoists.com Harrington Hoists, Inc. 401 West End Avenue Manheim, PA 17545 Phone: 717-665-2000 Toll Free: 800-233-3010 Fax: 717-665-2861 Harrington Hoists - Western Division 2341 Pomona Rincon Rd.
