Danfoss VLT HVAC Drive User Manual

Par. No. # Parameter description Default value 4 set-up Change during
operation
Conver-
sion index
Type
25-0* System Settings 25-00 Cascade Controller [0] Disabled 2 set-ups FALSE - Uint8 25-02 Motor Start [0] Direct on Line 2 set-ups FALSE - Uint8
25-04 Pump Cycling [0] Disabled All set-ups TRUE - Uint8
25-05 Fixed Lead Pump [1] Yes 2 set-ups FALSE - Uint8
25-06
Number of Pumps 2 N/A 2 set-ups FALSE 0 Uint8
25-2* Bandwidth Settings 25-20 Staging Bandwidth 10 % All set-ups TRUE 0 Uint8 25-21 Override Bandwidth 100 % All set-ups TRUE 0 Uint8
25-22 Fixed Speed Bandwidth casco_staging_bandwidth (P2520) All set-ups TRUE 0 Uint8
25-23 SBW Staging Delay 15 s All set-ups TRUE 0 Uint16
25-24 SBW De-staging Delay 15 s All set-ups TRUE 0 Uint16
25-25 OBW Time 10 s All set-ups TRUE 0 Uint16
25-26 Destage At No-Flow [0] Disabled All set-ups TRUE - Uint8
25-27 Stage Function [1] Enabled All set-ups TRUE - Uint8
25-28 Stage Function Time 15 s All set-ups TRUE 0 Uint16
25-29 Destage Function [1] Enabled All set-ups TRUE - Uint8
25-30
Destage Function Time 15 s All set-ups TRUE 0 Uint16
25-4* Staging Settings 25-40 Ramp-down Delay 10.0 s All set-ups TRUE -1 Uint16 25-41 Ramp-up Delay 2.0 s All set-ups TRUE -1 Uint16
25-42 Staging Threshold ExpressionLimit All set-ups TRUE 0 Uint8
25-43 De-staging Threshold ExpressionLimit All set-ups TRUE 0 Uint8
25-44 Staging Speed [RPM] 0 RPM All set-ups TRUE 67 Uint16
25-45 Staging Speed [Hz] 0.0 Hz All set-ups TRUE -1 Uint16
25-46 De-staging Speed [RPM] 0 RPM All set-ups TRUE 67 Uint16
25-47 De-staging Speed [Hz] 0.0 Hz All set-ups TRUE -1 Uint16 25-5* Alternation Settings 25-50 Lead Pump Alternation [0] Off All set-ups TRUE - Uint8 25-51 Alternation Event [0] External All set-ups TRUE - Uint8 25-52 Alternation Time Interval 24 h All set-ups TRUE 74 Uint16
25-53 Alternation Timer Value 0 N/A All set-ups TRUE 0 VisStr[7]
25-54 Alternation Predefined Time ExpressionLimit All set-ups TRUE 0
TimeOfDay-
WoDate
25-55 Alternate if Load < 50% [1] Enabled All set-ups TRUE - Uint8
25-56 Staging Mode at Alternation [0] Slow All set-ups TRUE - Uint8
25-58 Run Next Pump Delay 0.1 s All set-ups TRUE -1 Uint16
25-59 Run-on Line Delay 0.5 s All set-ups TRUE -1 Uint16
6.2.21. 25-** Cascade Controller
VLT
®
HVAC Drive Instruction Manual
6. How to program the adjustable frequency
drive
MG.11.A4.22 - VLT
®
is a registered Danfoss trademark 127
6

Danfoss VLT HVAC Drive Specifications

General

Type	VLT HVAC Drive
STO (Safe Torque Off)	Yes
Enclosure	IP20
Output Frequency	0-500 Hz
Brake Chopper	Built-in (depending on frame size)
EMC Filter	Built-in (depending on frame size)
Communication	Ethernet
Power Range	0.37 kW to 630 kW
Input Voltage	200-240V, 380-480V, 525-600V
Protection Features	Overload, Overvoltage, Undervoltage, Short Circuit, Ground Fault
Ambient Temperature	-10°C to +50°C (with derating above +40°C)
Storage Temperature	-25°C to +70°C
Relative Humidity	5-95% (non-condensing)
Cooling Method	Air-cooled