|FREQUENTLY ASKED QUESTIONS
Q- My relay has an indicating light but it doesn’t come on when the relay closes. Why?
A- One possibility is that the indicating light is an LED (light emitting diode) that is wired across the coil in reverse polarity to your DC control circuit. A solution to this problem is to use a relay with an indicating light that is not an LED.
Q-What is a diode
A- It is a current check valve allowing flow in only one direction. In DC circuits it establishes polarity. In AC circuits it acts as a half wave rectifier.
Q- What are bifurcated contacts in a relay?
A- Each movable contact is split in two.
Q- What is the purpose of bifurcated contacts?
A- Bifurcated contacts are used in circuits that operate at low current or voltage levels and in circuits where it is essential (perhaps for safety reasons) that the relay make up.
Q- What is the benefit of gold flashed contacts on a relay. Does Access stock them?
A- While gold is an excellent conductor, relay contacts are gold flashed primarily to prevent oxidation of the underlying silver alloy contact material. Access does stock some relays with gold flashed contacts.
Q- What is a “safety’ or “positively guided” relay? Does Access stock them?
A- A “safety” or “positively guided” or “forcibly guided” relay is a relay that is constructed so that the contacts are mechanically interlocked in such a way that the NC and NO contacts can never be closed at the same time even in the case of a malfunction such as contact welding. This type of relay must also maintain an open contact distance of at least 0.5mm over the full life of the relay in normal operation. Access stocks safety relays.
Q- Can you arrange to drop ship or ship directly to me from a manufacturer?
A- Yes, in most cases.
Q- Can you tell me how to wire my starter?
A- No. If you don’t know or can’t figure it out from an instruction booklet or wiring diagram, we suggest you call a qualified electrician. Remember, SAFETY FIRST!
Q- What does class 10, class 20, or class 30 mean on my overload relay?
A- The maximum time in seconds before the overload relay will trip under a locked rotor condition.
Q- I have a wye-delta wound motor and the motor nameplate says the FLA(full load amps) is 20. What should the overload relay of an electromechanical starter be set for?
A- 11.6 amps, which is 20 x .58
Q- I have a wye-delta wound motor and the motor nameplate says the FLA (full load amps) is 20. What should the overload relay of an Siemens electronic soft-starter be set for?
A- Set it for the FLA of the motor, 20 amps in this case.
Q- Why do I set the overload relay on my electromechanical wye-delta starter at 58% of the motor’s the FLA (full load amps)?
A- Only 58% of the current flows thru through the delta/run contactor to which the overload relay is attached. Note that .58 is the inverse of the square root of 3.
Q- My motor has 3 leads. It’s wound across the line/in line, right?
Q- My motor has 6 leads. Is it wound across the line or wye-delta?
A- The motor could be either a single voltage wye-delta wound motor or a dual voltage across the line motor. Most hydraulic elevator motors that are under oil are wye-delta wound. An air motor may be either. Check the motor nameplate to be sure.
Q- My motor has 9 leads. Is it wound across the line or wye-delta?
A- It is wound across the line/in-line.
Q- My elevator motor is has 12 leads. Is it wound across the line or wye-delta?
A- It is most likely a dual voltage wye-delta wound motor. For proper starter application check to see what line voltage is actually being used at this installation.
Q- The hydraulic elevator motor name plate on the outside of the oil tank shows it is a wye-delta motor but only 3 leads are coming out to the starter. What’s going on?
A- Most likely the motor is a wye-delta wound motor but the leads have been tied together inside so that it acts like an across the line wound motor. If you need to replace the starter you have a decision to make: Open the tank, pull out the motor and rewire it, pulling all 6 leads and possibly having to run new conduit, or purchase a new across the line starter or electronic soft starter.
Q- What’s the difference between a contactor and a starter?
A- A starter is a contactor with an overload relay attached.
Q- Does Access Elevator Supply offer any extended life contact kits?
A- Sometimes you may be able to install a larger contact kit than the original one that came with the contactor. Many manufacturers use the same body or frame for several different ratings. For example, if you had an Aromat FC65 contactor, you have the option of installing the original BM6-65 contact kit or either of the larger BM6-80 or BM6-85 contact kits.
Q- Why is the wye-delta starter that came with the elevator controller seem undersized? The motor HP is larger than the ratings on the contactors. When I order a wye-delta starter from Access, the motor and the contactor ratings match.
A- Some OEM controller suppliers de-rate starters and contactors for wye-delta applications to save money. At Access we provide only “fully rated” starters. They may cost a little more but last much longer.
Siemens Nordic Electronic Soft Starter Questions
Q- What information do you need to know to correctly choose a part number?
A- Motor HP or FLA, motor voltage, motor winding type: wye-delta or across the line, and application: hydraulic or traction.
Q- What motor voltages will this product work with?
A- 200-208, 230-240, 460-480, 575-600 volts
Q- Does the elevator starter work on both wye-delta and across the line/in-line wound motors?
Q- Since the starter works with many different voltages and both wye-delta & across the line wound motors, why do you have to know my specific motor information before quoting a part number and price?
A- A motor running at half the voltage, say 230V, draws twice the current of a 460V motor, for example. If the starter was provided based on an incorrect motor voltage, then it is probably improperly sized for the motor amps.
Q- I don’t think I have room in the controller. Does Access sell an indoor enclosure for the Siemens soft starter?
A- Yes, the part no. is 49EB217898 and the dimensions are 24-1/2”H x 12-1/2”D x 18”W
Q- Will this product work with single phase motors?
A- No, but Access does stock a Siemens single phase electronic soft starter.
Q- What control voltage does the starter require?
A- 120VAC± 15% Access can provide a control power transformer if you don’t have 120V available.
Q- What is the max amps that the MUTS(Motor Up to Speed) triac switch can handle? What if I run my valve directly off of this switch and it draws more current than that?
A- 1 amp max @ 120VAC. If you exceed this current, you will burn out the triac and void the warranty. Considering shipping expenses, repair cost, and down time, it is probably not cost effective to repair the unit.