Danfoss VLT HVAC 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 Destaging 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 Destaging 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 Destaging Speed [RPM] 0 RPM All set-ups TRUE 67 Uint16
25-47 Destaging 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 Mains Delay 0.5 s All set-ups TRUE -1 Uint16
6.2.21. 25-** Cascade Controller
6. How to programme the frequency converter VLT
®
HVAC Drive Operating Instructions
116 MG.11.A4.02 - 09.10.06. VLT
®
is a registered Danfoss trademark
6

Danfoss VLT HVAC Specifications

General

Enclosure Rating	IP20, IP21, IP54, IP55, IP66
Storage Temperature Range	-25°C to +70°C
Output Voltage Range	0-100% of supply voltage
Communication Protocols	Modbus RTU, BACnet, Ethernet/IP, Profibus DP
Ambient Temperature Range	-10°C to +50°C (without derating)
Relative Humidity	5% to 95% non-condensing
Altitude	Up to 1000 m without derating
Cooling Method	Air cooled
Application	HVAC systems, Pumps, Fans, Compressors
Voltage Range	200-240 V, 380-500 V, 525-600 V
Frequency Range	0 Hz to 590 Hz