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Fan Circuits, |
Most Nidec fans designed for operation with direct current have brushless dc motors with permanent magnets and electronic commutation control that uses Hall effect sensors.
The speed of ungoverned dc fan motors is linearly related to the applied voltage. The linear nature of the relationship is reliable at ratios of at least 2:1. This characteristic also enables automatic control of dc fan speed, which is frequently used to minimize input energy and noise generation.
Some fan applications require circuits that monitor operation and provide an output (alarm, shutdown) on a third lead wire if the fan's speed falls below an allowable minimum.
A common example of the alarm function is shown as option "-68," above. This option, and its inverse ("-82," high-pass/low- fail) is offered in all series of Nidec dc fans.
Another option that is availalble with all Nidec brushless dc fan models is a tachometer circuit terminated in a third lead wire (see option "-33, above). This circuit provides two square wave pulses per revolution. The signal lead of the fan is internally connected to the collector of a transistor that is triggered by the commutation of the motor windings.
Many other signal variations exist in Nidec's design library. Following is a sampler of signal and control options available with Beta V® and other legacy series of fans and blowers.
Standardized monitor and control options for the new Nidec UltraFlo™ series are published here.
| Option '-33' Open-Collector Tachometer |
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| To see a diagram of a locked rotor alarm circuit, click here. |
| Option '-68' Locked Rotor Alaram |
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| To see a diagram of an open-collector tachometer, click here. |
| Nidec Series | Cooling Fan Signal and Control Options | |||||||||||
| -25 | -26 | -29 | -33 | -34 | -35 | -36 | -68 | -82 | -87 | C | G | |
| DA150DC | - | - | - | Yes | - | - | - | Yes | Yes | - | - | - |
| Gamma 26 | - | - | - | Yes | - | - | - | Yes | Yes | - | Yes | - |
| Gamma 28 | - | - | - | Yes | - | - | - | Yes | Yes | - | Yes | - |
| Gamma 30 | - | - | - | Yes | - | - | - | Yes | Yes | - | Yes | - |
| Gamma 32 | - | - | Yes | Yes | - | - | - | Yes | Yes | - | Yes | - |
| TA100DC | - | - | - | Yes | - | - | - | Yes | Yes | - | - | - |
| TA120DC | - | - | - | Yes | - | - | - | Yes | Yes | - | - | - |
More...
| Nidec Series | Cooling Fan Signal and Control Options | |||||||||||
| -25 | -26 | -29 | -33 | -34 | -35 | -36 | -68 | -82 | -87 | C | G | |
| TA130DC | - | - | - | Yes | - | - | - | Yes | Yes | - | - | - |
| TA150DC | - | - | - | Yes | - | - | - | Yes | Yes | - | - | - |
| TA200DC | - | - | - | Yes | - | - | - | Yes | Yes | - | - | - |
| TA225DC | Yes | - | - | Yes | Yes | Yes | - | Yes | Yes | - | Yes | Yes |
| TA275DC | Yes | - | - | Yes | Yes | - | - | Yes | Yes | - | Yes | Yes |
| TA300DC | Yes | - | - | Yes | Yes | Yes | - | Yes | Yes | Yes | Yes | Yes |
| TA300DC SlimLine | Yes | - | - | Yes | Yes | - | - | Yes | Yes | Yes | - | - |
More...
| Nidec Series | Cooling Fan Signal and Control Options | |||||||||||
| -25 | -26 | -29 | -33 | -34 | -35 | -36 | -68 | -82 | -87 | C | G | |
| TA350DC | Yes | - | - | Yes | Yes | Yes | - | Yes | Yes | Yes | Yes | Yes |
| TA450DC | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| TA450DC SlimLine | Yes | - | - | Yes | Yes | - | - | Yes | Yes | Yes | Yes | Yes |
| TA600DC | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| VA225DC | - | Yes | - | Yes | - | Yes | - | Yes | Yes | - | Yes | Yes |
| VA300DC | Yes | Yes | - | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| VA350DC | Yes | Yes | - | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| VA450DC | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
Back...
Three lead wires, two power terminations. Fan speed control circuit terminated in third lead wire.
Three lead wires, two power terminations. TTL-compatible, 5V tachometer circuit terminated in third lead.
Three lead wires, two power terminations. Open-collector tachometer circuit terminated in third lead wire. Maximum tachometer voltage is the maximum rated operating voltage of the fan.
Four lead wires, two power terminations. Low-pass/high-fail Nidec '-68' alarm circuit terminated in third lead wire. Fan speed control circuit terminated in fourth lead.
Four lead wires, two power terminations. Square wave Nidec '-33' tachometer circuit terminated in third lead wire. Fan speed control circuit terminated in fourth lead.
Four lead wires, two power terminations. TTL-compatible, 5V tachometer circuit terminated in third lead wire. Fan speed control circuit terminated in fourth lead.
Three lead wires, two power terminations. Low-pass/high-fail, open-collector alarm circuit terminated in third lead wire. Maximum alarm voltage is the maximum rated operating voltage of the fan.
Three lead wires, two power terminations. High-pass/low-fail, open-collector alarm circuit terminated in third lead wire. Maximum alarm voltage is the maximum rated operating voltage of the fan.
Three lead wires, two power terminations. Non-isolated, non-latching, open-collector, delayed trip-point alarm circuit terminated in third lead wire.
Thermal speed control: Thermistor at the end of a special pair of lead wires for remote sensing of temperature.
Thermal speed control: Thermistor mounted on the housing of the fan.
Interactive control for tandem operation of two or more cooling fans for quiet, fail-safe operation.