Global Power Technologies
CATHODIC PROTECTION INTERFACE OPTION
05585 rev11 | Model 8550-SD
Page 47 of 53
9
CATHODIC PROTECTION INTERFACE OPTION
The Cathodic Protection Interface System provides for easy adjustment and monitoring of power to a
Cathodic Protection (CP) type load. The anode and cathode cables enter the cabinet at the bottom
and connect directly to the heavy-duty terminal block. Refer to Figure 29 for locations and
descriptions of the major components of the CP interface cabinet.
Figure 25 – Cathodic Protection Interface Panel
NOTE: Do not allow current to the cathodic protection load to exceed 30 Amps as this will trip
the circuit breaker.
The Model CP8550-SD generator is not rated to supply more than 30 amps of current to the load. If
total circuit resistance is less than 0.5 ohms then the 1000-watt variable resistor in the CP box should
be wired in series with the circuit and adjusted so that current does not exceed 30 amps.
9.1
METER
The dual scale meter displays voltage at the terminal block, and current when the PUSH TO READ
AMPS button is depressed. The meter is accurate to ±3% of full scale (50 mV) and is weatherproof.
9.2
CURRENT SHUNT
A shunt is used to measure the current to the terminal block. The voltage drop across the shunt is
proportional to the current flowing through it. The current shunt is rated at 30 Amps = 50 mV.
9.3
ADJUSTMENT
A 0 to 1 ohm, 1000-Watt variable resistor located at the top of the CP panel may be used to adjust
the output current of the CP interface. This resistor may be connected in series or parallel with the CP