Savaria Pro-lock 000849

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Technical Bulletin

Pro-lock maintenance

Part No. 000849, 29-m05-2014 Pro-lock maintenance

Savaria Corporation  2 Walker Drive, Brampton, Ontario, L6T 5E1, Canada  Toll free: (800) 791-7999  Fax: (905) 791-2222

Unless otherwise specified, Savaria Corporation accepts no responsibility for changes, labour, or

replacements incurred from this technical bulletin.

Part number 000849

Type Maintenance procedure

Bulletin number 29-m05-2014

Affects Prolift SCL, Prolift HD, PAL

Suggested action Use this bulletin to perform maintenance on the Pro-lock.

Standard notations

The following notations may be used throughout this technical bulletin to emphasize important safety

information, mechanical concerns, and other important information. Savaria recommends that you review

and follow all of these messages.

Danger messages indicate an imminently hazardous situation, which, if not avoided, results in death or

serious injury. All danger messages feature a standard ISO safety alert symbol followed by the signal word

Danger in capitalized black lettering on a red background.

Warning messages indicate a potentially hazardous situation, which, if not avoided, could result in death

or serious injury. All warning messages feature a standard ISO safety alert symbol followed by the signal

word Warning in capitalized black lettering on a dark yellow background.

Caution messages indicate a potentially hazardous situation, which, if not avoided, could result in death or

serious injury. All caution messages feature a standard ISO safety alert symbol followed by the signal word

Caution in capitalized black lettering on a yellow background.

Caution messages that do not include the ISO safety alert symbol indicate a potentially hazardous situation

for the machine only, which, if not avoided, could result in damage to the machine. These caution messages

include the signal word Caution in capitalized black lettering on a yellow background.

Note messages provide information, such as reminders, general information about a previous statement,

or additional guidelines that do not fit into the flow of the preceding text. All note messages include the

signal word Note in capitalized white lettering on a blue background.

DANGER

WARNING

CAUTION

NOTE

General

This technical bulletin is available through Savaria and

provides maintenance information for the Pro-lock.

Please contact Savaria for details regarding ordering

information.

For technical support, please call (800) 791-7999.

Visit our website at: www.savaria.com.

Disclaimer

Failure to follow instructions renders the Limited Warranty

null and void. In addition, any party installing or servicing

the product who deviates from these instructions agrees to

indemnify, save, and hold harmless the manufacturer from

any and all loss, liability, or damage that may occur as a

result of the deviation.

Warnings and hazards

To avoid injury, please ensure that you read and understand

this entire bulletin before performing the procedures.

Do not connect or disconnect any wiring while the power is on.

Failure to comply could result in death or serious injury.

Make sure all power disconnects are turned OFF if performing

any electrical work.

WARNING

ELECTRICAL SHOCK HAZARD

DANGER

TSSA web posted and current as of July 2014. Note: May be subject to revision by Savaria

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Summary

Pro-lock Maintenance Introduction and Safety

Standard Notations Explained

Explains safety symbols (DANGER, WARNING, CAUTION) and informational notes used in the bulletin.

General Information and Support

Provides bulletin availability, contact details, and website for Pro-lock maintenance information.

Disclaimer and Important Warnings

Details warranty voidance for deviation from instructions and electrical safety hazards.

Pro-lock Maintenance Procedures

Lock Contact Inspection and Cleaning

Step-by-step guide to check, clean, and verify the function of lock contacts and related components.

Pro-lock Adjustment Guide

Details the authorized methods for adjusting lock contacts and receiver position for optimal performance.

Pro-lock Adjustment Troubleshooting

Critical Measurements for Lock Adjustment

Provides critical measurements for lock plunger position and guidance for inspection if measurements are not met.

The Savaria Pro-lock is a critical safety component designed for use in various Savaria lift systems, including Prolift SCL, Prolift HD, and PAL models. It functions as a door interlock mechanism, ensuring that the lift cannot operate unless the door is securely closed and locked, and conversely, that the door cannot be opened unless the lift is safely stopped. This system is essential for preventing accidents and ensuring the safe operation of the lift.

Function Description:

The primary function of the Pro-lock is to provide a secure interlock between the lift's operational status and the door's open/closed state. It consists of several key components:

Lock Plunger: This is the movable part that engages with the locking tab to secure the door.
Locking Tab: Located at the bottom of the lock plunger, this tab is crucial for preventing the lock contacts from mating unless the beak lifts it, ensuring proper engagement.
Lock Contacts: These electrical contacts are responsible for signaling the lift control system about the door's locked status. When the door is properly closed and locked, these contacts mate, allowing the lift to operate. If the contacts do not mate, or if they break before the door is mechanically unlocked, the lift will not operate.
Beak and Keeper: The beak is part of the door mechanism that interacts with the keeper, which is part of the lock assembly, to ensure proper alignment and engagement of the lock plunger and locking tab.
Receiver: This component is mounted on the receiver plate and houses parts that interact with the door's beak to facilitate the locking action.
Locking Tab Actuator: This part is involved in the mechanical action of the locking tab.
Door Closed Microswitch: An additional microswitch located above the door verifies that the door is fully closed, providing an extra layer of safety.

The Pro-lock system operates on a principle where mechanical engagement precedes electrical signaling. The door must be physically closed and the lock plunger fully engaged, lifting the locking tab, before the electrical contacts can mate. This sequence prevents the lift from moving if the door is not securely locked, even if the electrical contacts were to somehow make premature contact.

Important Technical Specifications:

While specific electrical ratings for the contacts are not detailed, the mechanical measurements for proper operation are critical:

Lock Plunger Not Depressed: The gap should be between 4mm and 5mm. This measurement indicates the normal, unengaged state of the lock plunger.
Lock Plunger Depressed (using a pencil): The gap should be approximately 3mm. This measurement is used to check the contact break before the door is mechanically unlocked. If the contacts touch when the plunger is depressed to this extent, the lock requires repair or replacement.

These precise measurements are vital for ensuring the correct functioning of the interlock and the safety of the lift system. Deviations from these specifications can compromise the integrity of the safety mechanism.

Usage Features:

The Pro-lock is an integral part of the lift's safety system, operating automatically as the door opens and closes. Its design focuses on reliable and secure operation, ensuring that the lift adheres to safety standards. The system is designed to withstand regular use, but like all mechanical and electrical components, it requires periodic inspection and maintenance to ensure continued performance. The robust construction aims to prevent accidental disengagement or failure during normal operation.

Maintenance Features:

The Pro-lock system is designed with maintainability in mind, featuring several inspection and adjustment points to ensure its longevity and reliable operation. The maintenance procedure outlines a comprehensive set of checks:

Security and Condition Checks:
- Verify that locks are properly secured, clean, dry, and corrosion-free.
- Inspect beaks and keepers for security, cleanliness, dryness, and good condition.
- Check locks for wear and smooth operation.
- Ensure lock contacts are clean and properly fixed.
Cleaning:
- Clean contacts using a lint-free cloth only; abrasive materials are strictly prohibited to prevent damage.
Functional Checks:
- Crucially, check that the lock contact breaks before the door is mechanically unlocked. This involves a specific test: pushing the center lock plunger in with a pencil and ensuring the lock contacts DO NOT touch. If they touch, the lock needs repair or replacement.
- Verify the locking tab's function: it must prevent contacts from mating unless the beak lifts it.
- Inspect lock wiring, switches, and solenoids for mechanical damage, secure terminations, or signs of excessive heating.
- Confirm that rattling the doors during motion does not stop the lift, indicating proper interlock engagement.
- Check the additional door closed microswitch above the door for security, cleanliness, dryness, and good condition.
Adjustment Procedures:
- Lock Position Adjustment: Three nuts hold the lock in place. Loosening these allows the lock to be moved closer to or farther from the door.
- Receiver Position Adjustment: Two bolts secure the receiver to the receiver plate. Loosening these allows the receiver to be moved to the best position.
- Swipe Adjustment: To increase the "swipe" on the contacts, the receiver plate can be shimmed out from the door using 1/4" flat washers.
- Critical Component Inspection: If adjustments do not meet the specified measurements, inspect screws holding contact mounts, the mounts themselves, and nuts on the contacts (including flat and lock washers). Older models with clips and soldered wires also require inspection for tightness and good repair.
Lubrication Restrictions: A critical maintenance note is to NEVER grease or lubricate the locking tab, as this can interfere with its proper function and potentially compromise safety.
Replacement: If any components cannot be corrected without modifying the lock, replacement of the entire lock is recommended.

The emphasis on precise measurements and specific adjustment methods highlights the critical nature of the Pro-lock's role in lift safety. Regular and thorough maintenance, as outlined, is essential for maintaining the safety and operational integrity of Savaria lift systems. The bulletin also includes important safety warnings regarding electrical work, stressing the need to turn off all power disconnects before performing any electrical tasks to prevent serious injury or death.