Grundfos Control HVAC, Инструкция по установке и эксплуатации

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Pos. Description
8
Air-handling zone: Air-handling unit (AHU),
fan, coil, etc.
Fig. Example of a variable-primary-flow HVAC system with
three pumps, three chillers and three air-handling zones.
4.3 Electrical connection
The electrical installation must be carried out by an authorised
person in accordance with local regulations and the relevant wiring
diagram. Before connecting your devices to the main cabinet and
the subcabinets, check that the following requirements are met:
DANGER
Electric shock
Death or serious personal injury
‐
Make sure that the power supply cannot be switched
on accidentally.
1. The electrical installation must comply with enclosure class
IP54 or UL type 3R.
2. The supply voltage and frequency must correspond to the
values stated on the nameplate.
3. The wire cross-section must correspond to the specifications in
the wiring diagram.
4. The type of control and/or feedback signal of connected
devices must correspond to the controller version. The signals
are described in the following table.
Connected device
Signal
Control Feedback
External VFD 0-10 V 4-20 mA
Bypass valve 4-20 mA /0-10 V 4-20mA / 0-10 V
4.3.1 Connecting the main cabinet
The following devices must be connected according to the wiring
diagram delivered with the cabinet:
•
power supply
• VFD
• differential-pressure sensors over pumps, chillers and the two
first air-handling zones
• chiller on/off signals from chiller controller, BMS or isolating
valve.
Optional
•
Bypass valve
• temperature sensors
• flow sensor
• Hands / off / auto (HOA) switches for system
• Hands / off / auto (HOA) switches for pumps.
If there is only one air-handling zone in your system, you can
connect a redundant differential-pressure sensor for the zone.
Connect the redundant sensor to the terminal for the sensor of the
second air-handling zone.
4.3.2 Connecting subcabinets
If you have ordered a subcabinet, the following devices must be
connected according to the wiring diagram delivered with the
subcabinet:
•
power supply
• EtherCAT cable to main cabinet
• EtherCAT cable to the next subcabinet, if any
• differential pressure sensors from air-handling zones.
5. Commissioning the product
5.1 Setting the product
5.1.1 Setting the pump bank
The controller must be unlocked.
1.
Go to Pump bank > Pump bank settings .
2. Set the following parameters:
a.
Enable pump changeover : Enable if you want the controller
to automatically change the operating pump after a defined
time.
b. Time of day for changeover : Enter the time for pump
changeover (1-24).
c. Enable maximum number of running pumps : Enable if
you do not want more than the specified maximum number
of pumps to operate at the same time.
d. Maximum number of running pumps : Enter the maximum
number of pumps to operate at a given time.
e. Enable minimum number of running pumps : Enable if
you want a minimum number of pumps to operate at the
same time when the controller is on.
f. Minimum number of running pumps : Enter the minimum
number of pumps to always operate.
g. Minimum time between start and stop : Enter the minimum
time in seconds for a pump to stop after having started.
h. Ramp up / ramp down time : Enter the time for the pump
ramp up, that is the time for the pump to accelerate to its
operating speed, and ramp down, that is the time for the
pump to decelerate to its stop speed.
i. Number of pumps : Enter the number of pumps in your
system.
j. Enable terminal alarm : Enable if you want the controller to
give alarms related to the pump terminal.
k. Enable warning on single pump failure : Enable if you
want the controller to give a warning when one pump fails.
l. Enable alarm on all pump failure : Enable if you want the
controller to give a warning when all pumps fail.
3. Go to Pump bank > Cascade operation .
4. Set the following parameters:
a.
Cut-in speed : Enter the speed at which a new pump is to be
cut in.
b. Cut-out speed : Enter the speed at which a pump is to be cut
out.
The cut-in and cut-out speed of a pump can be different
depending on the number of pumps running.
Related information
7.7 Pump cascade control. See page 12.
9.1 Navigating the display. See page 14.
9.11 Unlocking the controller. See page 15.
9.11 Unlocking the controller. See page 15.
5.1.1.1 Setting the pumps
1. Go to Pump bank > Pump bank status
2. Select the pump you want to set.
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English (US)