Cascade Control Connection - Danfoss VLT Series Quick Manual

Quick Guide
1 1

1.5.4 Cascade Control Connection

One Pump, One Relay Mode: when 25-57 Relays per
Pump=1
+24 V
D IN
D IN
COM
D IN/OUT
D IN/OUT
+10 V
A IN
A IN
COM
A OUT/D OUT
A OUT/D OUT
COM RS-485
P RS-485
N RS-485
Illustration 1.19 One Pump, One Relay Mode
Every pump operation is controlled by one output.
1. When 25-04 Pump Cycling=[0] Disable: maximum
5 pumps.
2. When 25-04 Pump Cycling=[1] Enable: maximum 4
pumps.
3. 2 relays and 2 digital outputs are available.
24
FC 111
12
18
19
20
27
29
50
53
54
55
42
45
1
2
3
4
5
6
61
68
69
MG18F402 - VLT
®
VLT HVAC Basic Drive Cascade Controller Quick Guide
One Pump, Two Relay Modes: when 25-57 Relays per
Pump=2
Start
3# Pump
4# Pump
Pressure +
Pressure -
1# Pump
2# Pump
Illustration 1.20 One Pump, Two Relay Modes
Every pump operation is controlled by two outputs.
1.
2.
3.
4.
®
is a registered Danfoss trademark
FC 111
+24 V 12
D IN 18
D IN 19
COM 20
D IN/OUT 27
D IN/OUT 29
+10 V 50
A IN
53
A IN
54
COM
55
A OUT/D OUT
42
A OUT/D OUT
45
1
2
3
4
5
6
61
COM RS-485
P RS-485 68
N RS-485 69
Dedicated PLC not necessary as control
When 25-04 Pump Cycling=[0] Disable: no pump.
When 25-04 Pump Cycling=[1] Enable: maximum 3
pumps.
2 relays, 2 digital outputs and 2 analog outputs
are available.
Start
2# Pump_Main
2# Pump_Drive
Pressure +
Pressure -
3# Pump_Main
3# Pump_Drive
1# Pump_Main
1# Pump_Drive