8
Product interface
FCM-802/804 overview
4
5
Performance
Function
Specification
Hydrogen inlet
500mbar.g – 800mbar.g
Fuel supply
G1/8 parallel thread, with face seal
Air inlet
0-16 Sm
3
/min
5–40°C
Ambient air filtration and supply
510 × 240mm duct
Exhaust air
0-16 Sm
3
/min
5–60°C
Air exhaust to ambient
3 × 140mm dia. duct
Power connection
15.0–56.0V
Connection to DC bus
M10
Communication port
See section 6.5
Operational commands & diagnostics
D type 9 way
4.1
Interface specification
This manual sets out an operating overview for Intelligent Energy’s 802 and 804
FCMs. The 802 and 804 FCMs are part of the 800 Series products, which also feature a
FCM 801 which can provide power up to 1.2kW.
The FCM-802/804 provides regulated DC at nominal output voltage, which can be
defined by the user at a nominal 24V or 48V. The FCM-802/804 will hold the DC output
at the nominal voltage while connected to an external battery or power supply so
that the system will act as a hybrid system. In the hybrid system, the battery is used
to provide power whilst the fuel cell starts, supports the load during the fuel cell
Performance Optimisation Cycle (POC) and in the standby state. Hydrogen gas must be
provided at a regulated pressure to the module inlet. The FCM-802/804 will generate
power when it is given both Enable and Run signals (see Section 7.1 & 7.2).
During normal operation, the FCM-802/804 will conduct a POC where power
delivery is briefly interrupted. In this period, the fuel cell will hybridise with the
external battery (see Section 8.3 Performance Optimisation Cycle (POC)). If during
normal operation the load drops to a low level (e.g. less than 6A, as default for
FCM-804), the fuel cell will enter a standby state (see Section 8.4 Standby State). This
is designed to optimise fuel consumption. If the DC Bus voltage then dips below a
pre-set voltage, the fuel cell will restart.
During normal operation, the FCM-802 or 804 will periodically conduct an optimisation
cycle which improves the performance of the fuel cell. Power production is reduced or
suspended for up to 12 seconds during the cycle so an external power source may be
needed to briefly provide power to the load, for more details see section 8.3.
