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VERTEX™ Fan Ramp-down
The fans will respond to decreasing speed signal, per Figure 19:
1.
Between 20mA and 4.4mA the fans ramp down linearly and proportionally to the input speed signal.
2.
For control signals between 4.4 and 1.9mA, the fans will stop.
3.
If the fan signal is less than 1.8mA for more than 60 seconds:
a.
The alarm light on the control panel will turn ON and an alarm signal will be enabled.
b.
All fans will rotate at the emergency speed.
EC Fan System Troubleshooting
Loss of Control Signal
Refrigeration System Controller Power Outages
1.
When a power outage lasts for less than 60 seconds:
a.
The fans will remain on at the last known speed.
b.
After power restoration, the fans will resume operation according to the control signal. No alarm signal will
be sent to the control system.
2.
When a power outage lasts for more than 60 seconds:
a.
The fans will rotate at the emergency speed.
b.
An alarm light on the control panel will turn on, and an alarm signal will be enabled.
Single Fan Communication Loss
1.
If the signal is restored within 60 seconds:
a.
The affected fan will run at the last known control signal as long as the signal returns in less than 60
seconds.
b.
The remaining fans will run according to the control signal.
2.
If the signal is not restored within 60 seconds:
a.
All fans will run at the emergency speed.
b.
The alarm light on the control panel will turn on and an alarm signal will be enabled.
3.
To troubleshoot:
a.
Confirm that all fans are powered.
b.
Turn the override switch on the control panel to the ON position and amber light will turn ON.
c.
All the remaining fans that are not in an alarm state will start to rotate based on the fans speed signal.
d.
If there is a problem with any individual fan that either does not rotate or rotates backwards, visually
observe the fans to identify the affected fan.
e.
Shut down the unit completely, including the spray pump and breaker for the affected fan.
f.
Follow all applicable safety procedures and lockout/tagout procedures before entering the unit.
Vertex™ Evaporative Condenser Operation & Maintenance Manual – Fan Control
Page | 49
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