Watson-Marlow 120U/D1 - Manual (Page 9)

Watson-Marlow 120 IP31 pumps: general information 7
Power supply specifications
Insulation category Class II: double insulated, no earth
Mains voltage/frequency
90-264VAC, 47-63Hz, 1ph
Mains current 0.7A @ 100VAC; 0.4A @ 230VAC
Output voltage 24VDC
Output power 24W @ 30C; 18W @ 40C
Protection Hiccup mode: recovers automatically after fault removed
Overload protection 110%-200% of rated output power
Working temperature -10C to 50C, 14F to 122F
Operating humidity 20% to 90% RH, non-condensing
Over-voltage 115% to 135%
Note: Pump specifications are included in Section 2
of these instructions.
1.8 Good pump
installation practice
1.8.1 General
recommendations
Position
The 120 pump must be mounted in the upright posi-
tion and not inverted or placed on its rear face.
A correctly engineered installation will promote long
tube life. Site the pump on a flat, horizontal, rigid
surface, free from excessive vibration, to ensure
correct lubrication of the gearbox. Allow a flow of air
around the pump to ensure that heat can be dissi-
pated. Ensure that the temperature around the
pump does not exceed 40C.
It is possible to stack only one other 120 pump on
top of this pump. The case’s third row of feet ensure
ventilation between pumps and allow the top pump
to be set back a little to give clear access to the
lower pump’s keypad. You can place other equip-
ment on the pump’s upper surface as long as the
ambient temperature does not exceed 40C.
Emergency disconnection
The pump's external DC power supply is the discon-
necting device, which must be readily identifiable
and easily reached, for isolating the motor drive
from the mains supply. Note: There may be a slight
delay after isolating the pump before the pump
stops.