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Building Management System
All controls are equipped with the ability to control the fans via a dry contact BMS interlock. There are two
interlocks available: IL1 is for low voltage (24V DC), and IO1 is for high voltage (120V AC). The two
interlocks will force the fans to different speeds. The low voltage interlock will force the fans to operate at
the low voltage BMS speed. The high voltage interlock will force the fans to operate at the maximum VFD
frequency. If both interlocks are used at the same time, the high voltage interlock takes precedence, and
fans will go to their maximum defined speeds. Either BMS interlock will override both Auto and/or Manual
mode.
Figure 43 - BMS Mode Display
Emergency Shutdown Interlock
On the ECPM03 circuit board, near the top left of the board, there are terminals IL2A and IL2B. Closing a
dry contact between these two terminals will stop all fans, sound an alarm, and display EMERGENCY
SHUTDOWN on the HMI. The audible alarm can be temporarily muted with the MUTE button. This is a
24V DC signal that is designed to be used in conjunction with a Building Fire Alarm panel or similar. Once
the contact is opened up between these two terminals, a manual reset is required to exit the emergency
mode. Pressing the CLEAR button will force the HVLS control to enter the mode that it was in previous to
the Emergency mode. Emergency Shutdown is the highest priority command. It supersedes all other
modes, including, System Bypass, BMS mode, auto mode, and manual mode. Priorities are:
1. Emergency Shutdown (Highest Priority)
2. System Bypass
3. BMS (Building Management System) Mode
4. DDC (Direct Digital Control) Mode
Manual/Auto Mode from HMI (Lowest Priority)
FAN 1 - GROUP 1
TEMPERATURE: 67.7°F
FAN SPEED: 27% (15Hz)
BUILDING MANAGEMENT
OVERRIDE
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