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What is the DIN numbering of terminals?
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For contactors, the system indicates inputs & outputs & their relationship, but for relays & auxiliaries it is more complicated, as the numbers also indicate the position & the function of the contacts (whether normally open or normally closed, for example). Similar products from any manufacturer must bear the same markings. A fuller explanation of the DIN terminal markings is given in the Danfoss motor control gear handbook.
Click here for an illustrative example (PDF, 308 KB)
- opens in a separate window
lav link foor pdf file !!!!!!!!
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How do I wire a starter for remote control?
Click here for an illustrative example (PDF, 79 KB)
- opens in a separate window
Please see the example above.. If you do not understand or you have further questions we are happy to help you. Please contact the technical team on:
0870 241 7010
uk.controls.technsupport@danfoss.com
Switching motors on from two places is generally considered bad practice although it is common to switch motors off from two points.
link pdf file ???????????????+
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Is CI 85 compatible with CI 86?
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Yes, BUT CI86 is physically smaller and does not have built in auxiliary contacts like the CI85. Contactor CI85 included 1NO (Normally Open) and 1NC (Normally Closed) built in auxiliary contact. For an equivalent function select CI86 and order CBD-11 (037H3064) front mount auxiliary or CBD S-11 (037H3069) side mount auxiliary. Both of these options offer 1NO and 1NC auxiliary contacts.
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How do I set the Thermal Overload relay?
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The Thermal relay must always be set at a value corresponding to the motor rating - never at a higher value. The motor rating is normally specified on a rating plate fixed to the motor and is identified as the Full Load Current (FLC).
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What replaces CI 72?
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CI73. Do note that CI72 had built in auxiliary contacts (1NO & 1NC), so for an exact eqivalent part please add CBD S-11 (037H3069) side mount auxiliary contact (1N0 & 1NC).
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Can I use a new CI 86 contactor in the old CI 85 range which it replaced?
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No! The CI85 has a larger frame size, the CI86 will therefore not fit a CI85.
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What does type 1 and type 2 of short circuit co-ordination mean?
Co-ordination 1
No damage to equipment or personal injury may occur in the event of a short curcuit. However, contactors and thermal overload relays are not required to remain functional following the short circuit.
Co-ordination type 2
No damage to equipment or personal injury may occur in the event of a short cuircuit. However, light contactor welding is permissible, provided that the contacts can be separated without deformation, using a screwdriver for example.
Contactors and thermal overload relays must remain completely functional following the short circuit.
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What protection does a Thermal Overload relay provide?
The Thermal Overload relay is used when driving squirrel cage motors and provides over-current protection of the motor, which, for example, may be caused by motor jamming or excessive mechanical load. The overload relay WILL NOT protect the motor or other circuit items in the event of a short circuit.
Danfoss overload relays provide single-phase protection, i.e. accelerated release if drop-out of a single phase occurs (asymmetric overloading). A typical example of this fault condition would occur if a fuse fails.
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Can I use a Thermal Overload relay with a Single Phase supply?
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Yes, however the thermal overload relay MUST be configured such that the single phase supply is fed through all of the thermal overload inputs and outputs in a sequential loop i.e. wired in series. Failure to do so will result in accelerated release due to asymmetric loading, see "What protection does a thermal overload provide?"
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Why are there two scales on the Thermal Overload relay?
For lower power motors the most common method of wiring the three-phase supply to the motor is direct start, otherwise known as direct-on-line (DOL). In this instance the thermal overload relay is set using the front most scale printed on the side of the relay.
When switching high power motors it is common to use the star-delta (Y/D) starter configuration in order to reduce initial load current. When using Y/D starters the thermal overload relay is set using the rear of the two scales, it is marked Y-∆ SCALE.
In both instances the value set on the thermal overload relay will be the motor full load rated current.
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What is the control voltage?
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This is the type of load that you are using, AC-1 is an ohmic load and covers heaters and lights etc. AC-3 is a load produced by a motor. AC-15 is a load produced by a transformer, or a coil as is the type of load our coils have when pulling in the main contactor.
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What does AC-1, AC-3 and AC-15 mean?
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This is the type of load that you are using, AC-1 is an ohmic load and covers heaters and lights etc. AC-3 is a load produced by a motor. AC-15 is a load produced by a transformer, or a coil as is the type of load our coils have when pulling in the main contactor.
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Can I buy a C 6?
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The C range of contacts has now been replaced by the CI range of contactors &ndash typically if you have a C 6 then this can be replaced by a CI 6. This is the same for all the contactors, except for the C 10, for which we would recommend the CI 12 as a replacement.
Note: Most of the old range of contactors had built in auxiliaries, now the auxiliaries will have to be purchased separately.
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What is a pole?
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'Pole' is the term used here as shorthand for the pair of contacts which makes or breaks one phase only. Most contactors control three phases & so can be called “three pole”. Some have a fourth set of parallel main contacts which can be use to make or break the neutral wire AS WELL: please note that YOU MUST NOT SWITCH THE NEUTRAL ALONE.
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What is the control voltage?
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This is the voltage used to pull in the main contactor, for instance you may be using 3 phase electricity of 415V through the main contactor to start a motor, but the voltage you use to switch the contactor to start this motor may only be 24V or even 230V, it is this which is the control voltage.
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Why is there a necessity for a fourth pole?
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Most circuits have three phases. On some, usually smaller, systems, it is desired to break the neutral wire as well as the three “live” phases. Danfoss contactors provide this option up to and including CI 15.
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