Specifications

6.1.13 Cascade Controller Wiring Diagram
The wiring diagram shows an example with the built-in BASIC cascade controller with one variable speed pump (lead) and
two fixed speed pumps, a 4-20 mA transmitter and system safety interlock.
Power Card
MOTOR MAINS
RELAY 1
(cascade
pump 1.)
RELAY 2
(cascade
pump 2.)
+24V OUT + 24V OUT
(Start)
(Safety Interlock)
(Feedback 1 res.)
Control Card
System
Start/
Stop
From Motor Control Circuitry
System
Safety
Interlock
Pressure
Transmitter
4-20 mA,
L1
L2
L3
PE
N
130BA378.10
P
24 V dc
12 13 18 19 27 29 32 33 20 39 42 50 53 54 55
COM D IN D IN 1 D IN1 D IN1/D OUT D IN1/D OUT D IN 1 D IN 1 A IN2 A OUT1 COM A OUT + 10V OUT A IN1 COM A IN
96
U
97
V
98
W
PE
91
L1
92
L2
93
L3
01 02 03 04 05 06
MMM
Illustration 6.11 Cascade Controller Wiring Diagram
6.1.14 Start/Stop Conditions
For more information, see parameter group 5-1* Digital Inputs5-1*.
Command Variable speed pump (lead) Fixed speed pumps (lag)
Start (SYSTEM START/STOP) Ramps up (if stopped and there is a
demand)
Staging (if stopped and there is a demand)
Lead Pump Start Ramps up if SYSTEM START is active Not affected
Coast (EMERGENCY STOP) Coast to stop Cut out (correspond relays, terminal 27/29
and 42/45)
External Interlock Coast to stop Cut out (built in relays are de-energized)
Table 6.1 Commands Assigned to Digital Inputs
Variable speed pump (lead) Fixed speed pumps (lag)
Hand On Ramps up (if stopped by a normal stop
command) or stays in operation if already
running
Destaging (if running)
Off Ramps down Destaging
Auto On Starts and stops according to commands via
terminals or serial bus cascade controller
only can work when the frequency converter
is in "Auto ON" mode
Staging/Destaging
Table 6.2 Function of LCP Keys
Application Examples VLT® HVAC Drive FC 102 Design Guide
MG16C102 - Rev. 2013-08-20 161
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