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TESTING & TECHNICAL DATA
Fan/Motor Compatibility: The Nimbus-HP is
compatible with many PSC (Permanent Split Capacitor)
and shaded pole motors. The Nimbus-HP is not
compatible with capacitor start motors. Confirm TRIAC
controllability with the motor manufacturer before
installation or contact CRI customer service for
testing recommendations. Attempting to control a
motor that is not compatible could cause excessive
heating and could permanently damage the motor.
Control Accuracy and Hysteresis: The standard
Nimbus-HP is accurate to within ±1.5°C in the
temperature control mode and ±0.4VDC, ±0.8mA in the
control signal mode. If your application requires greater
accuracy, contact customer service. For most singlephase
AC fans, there is direct correlation between speed
and voltage. For some fans however, this will not be the
case. To prevent fans (using fan ON/OFF feature) and
alarms from cycling on and off, a certain amount of
hysteresis has been built in to the Nimbus-HP. That is,
fans will shut off 2-3% below the set point and turn back
on 2-3% above the set point. Alarms will turn on at the
set point and turn off 1-2°C below or 5% above the set
point.
Voltage Loss:
For a typical fan, expect a voltage drop
to the fan of about 4-10% at full voltage.
Power connections are made through ¼” x .032” spade
lugs (TB3, TB4) located on the circuit board. Use
insulated quick connects to connect to the spade lugs.
When installing Nimbus-HP with the enclosure, connect
fan and power wires through the 0.813” D hole in the
side of enclosure and secure with a strain relief.
The Nimbus HP is not compatible with Uninterruptible
Power Supplies (UPS) that generate a square wave.
Changing Control Settings:
With the exception of the
“fixed speed mode”, the Nimbus-HP will not recognize
any changes in switch or jumper settings made with
power applied. Power must be turned OFF before
changing any switch or jumper settings.
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Minimum Motor currents: Motors may not control
properly if the total current draw is less than 1 Amp.
Maximum Motor currents:
Some motors draw higher
current at less than maximum voltage. Contact motor
manufacturer for details.
Start Pulse:
Some fans that run at lower voltages will
not start at these voltages; therefore the Nimbus-HP will
start at full voltage for 2 seconds before regulating to the
appropriate control speed.
EMI: The amount of electrical noise emitted by the
Nimbus-HP increases as speed decreases. The amount
of noise emitted is motor dependant. If the electrical
noise is an issue, an AC Input Line Filter can be used.
CRI recommends the following line filters from
www.filterconcepts.com or equivalent.
Specifications:
- Power source: 85 to 300 VAC
- Frequency: 47 to 64 Hz
- Maximum current rating: 18 Amps
- Minimum load required: 1 Amp
- Fusing: 25 Amps at both inputs
- Operating temperature: -25°C to 65°C
- Storage temperature: -40°C to 125°C
- Relative humidity: 95% non-condensing
- Weight (no cover): 1.25 lb (567 grams)
- Weight (with cover): 1.90 lb (862 grams)
- RoHS (6/6) compliant
- Agency approvals pending
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