Control Response; Response Time, Fdc 045/053 - Danfoss H1P 045 Technical Information

Technical Information
H1 Axial Piston Single Pumps, Size 045/053
Control Options
32 | © Danfoss | May 2017
Pump displacement vs. control current
Forward
100%
H1 FDC control
N b
a
a = Forward Threshold
b = Reverse Threshold
N = Neutral Override Current
100%
0
Signal Current (mA(DC
Reverse

Control Response

H1 controls are available with optional control passage orifices to assist in matching the rate of
swashplate response to the application requirements (e.g. in the event of electrical failure). The time
required for the pump output flow to change from zero to full flow (acceleration) or full flow to zero
(deceleration) is a net function of spool porting, orifices, and charge pressure. A swashplate response
table is available for each frame indicating available swashplate response times. Testing should be
conducted to verify the proper orifice selection for the desired response.
H1 pumps are limited in mechanical orificing combinations. Mechanical servo orifices are to be used only
for fail-safe return to neutral in the event of an electrical failure.
Typical response times at the following conditions:
∆p
Viscosity and temperature
Charge pressure
Speed

Response time, FDC 045/053

Stroking direction
Full flow to neutral
Full forward flow to full reverse flow
Max Current
))
Avg
P301 443
250 bar [3626 psi]
30 mm²/s [141 SUS] and 50 °C [122 °F]
20 bar [290 psi]
-1
1800 min (rpm)
0.8 mm [0.03 in] Orifice
1.9 s
2.8 s
11063344 | BC00000059en-US1001