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MOUNTING
The Nimbus-HP is supplied with six 0.16”D mounting
holes suitable for #6 screws. Use at least 4 screws to
mount the Nimbus-HP. See figure 1.
CONNECTIONS
WARNING: Dangerous voltages are present on the
circuit board when connected to the power line.
Power must be removed before making any
connections or adjustments to avoid electrical
shock or damage to the unit.
Power Connections
It is recommended that an adequately sized circuit
breaker be connected between the power service and
the Nimbus-HP to permit fail-safe removal of power
before making adjustments or connections.
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.
Fan Connections
Fan connections are made through ¼” x .032” spade
lugs (TB1, TB2) located on the circuit board. Use
insulated quick connects to connect to the spade lugs.
Any number of fans may be connected in parallel as long
as the total current does not exceed the output power
rating. See table 1.
When installing Nimbus-HP with the enclosure
(TRC18XXE-F), connect fan and power wires through
the 0.813” D hole in the side of the enclosure and secure
with a strain relief.
Temperature Sensor Selection and Connection
The Nimbus-HP will accept signals from up to 3
temperature sensors and control fan speed based on the
hottest sensor. Choose an air, surface or liquid
temperature sensor from the CRI catalog or website at
www.controlres.com. Each sensor, S1, S2, S3 shares a
common return marked SRTN. CAUTION: SRTN is a
non-isolated input; use CRI sensor P11-F (jacketed
cable) if the sensor is accessible.
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Connect the sensor wires through the 0.813” D hole in
the side of the enclosure and secure with a strain relief.
When fewer than 3 sensors are used, sensors may be
hooked up to S1, S2 or S3. In “Temperature Mode”, if
no sensors are connected or all sensors read below
-25°C, fans will run at full speed and the temperature
alarm will activate.
The Nimbus-HP can also be supplied with a board
mount sensor, contact customer service for details.
Remote Powered Transducer Connections
When used in the remote transducer mode, the
Nimbus-HP can power and control from any 0-5VDC
transducer (humidity, pressure, flow etc.) with a
maximum supply current of 5mA. Connect the + lead to
SRTN, connect – to S1, connect Vout to S2.
Refer to “USING REMOTE POWERED TRANSDUCER
MODE” section to set control parameters for your
transducer.
Over Temperature and Loss of Signal Alarm
Connection
When used in the temperature control mode, (see table
1) an over-temperature alarm can be triggered when the
temperature goes 10°C (18°F) above the control
temperature (TC) or below -25°C. When used in the
Voltage or Current signal mode a “loss of signal” alarm
can be triggered when DIP switch #6 is in the ON
position. Alarm connections are made at –ALM+
The alarm output is a normally open, optically isolated
MOS Relay. When no alarm condition is present, the
relay is closed and can conduct up to 100 mA (AC or
DC) of load current. When the alarm is triggered, the
relay opens, and can support up to 300 Volts (AC or DC)
across its terminals. Other alarm trigger points can be
supplied, contact customer service for details. See
figure 5, 5a, 5b or 5c for possible alarm configurations.
Current or Voltage Control Signal Connections
When used in the current or voltage control mode (see
table 1), connect a 0-10VDC or 0-20mA control signal to
–ISO+ as shown in figure 5
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