Fluidwell E018

E018-P
FW_E018-P_M_v0302-02_EN Page 41
6.4.3 ELECTRICAL RATINGS
Power supply (Type AH, PX, PD)
The following supply ratings apply to the E-Series when the indicated options are installed (other
options have negligible influence on the ratings) and should be used to select a suitable power
supply and overcurrent protection:
Type Input
Supply
voltage
Power
rating
Current
@24V
Remarks
PD-OR P6 24-27 VDC 4W 155 mA With relay(s) and sensor supply
PD-OT P2 9-27 VDC 3W 105 mA Without relay(s), with sensor supply
PX P2 9-27 VDC 1W 30 mA Without relay(s) and sensor supply
AH A1/A2 11-27 VDC 0.7W 25 mA Analog output circuit that also powers
the unit. Requires an additional
supply on terminal P2 or P6 when
combined with relay(s), sensor supply
or backlight.
Only use terminal P2 when terminal P6 is not present.
Relays outputs (Type OR)
The relays (up to two) that come with Type OR have the following contact ratings, which should be
used to select a suitable power supply and overcurrent protection for the circuits connected to the
relay outputs R8 to R11:
Load type & voltage Maximum voltage
Maximum switch
current
Resistive load at 30 VDC / 250 VAC Max. 1 A
Inductive load (for pilot duty applications) 30 VDC / 250 VAC Max. 0.5 A
The relays must be suitably protected for their ratings not to be exceeded. This shall be considered
in the end use.
6.4.4 VOLTAGE SELECTION SENSOR SUPPLY
Type PB / PX – Pickup element supply
Terminal S3 provides a limited supply voltage of 3.2 VDC (coil signals 1.2 V) for the flowmeter signal
output. Output impedance is 2700 ohms and power is limited to 3.3 mW under short circuit
conditions.
Limited power
This voltage MAY NOT be used to power the flowmeter electronics, converters, etc. as it will not
provide adequate sustained power! All energy used by the flowmeter pickup will directly influence
battery life (type PB). It is strongly advised to use a “zero power” pickup such as a coil or reed-
switch when operating without external power. You can use some low power NPN or PNP output
signals, but battery life will be significantly reduced (consult your distributor).