Troubleshooting guide

Monark 831 E
6
Operation of the ergometer
The Ergomedic 831 E is built on a stabile frame, a
well-balanced flywheel, a break belt and a pendulum
weight which measures the force. Handles and a chain
drive are provided to spin the flywheel as a tension
device tightens the belt to regulate the braking force
applied to the wheel. The pendulum indicates the
applied force directly on the scale located on the right
side of the flywheel.
The computer system consists of one main unit and
one control unit (terminal, PC or ECG). The main
unit reads in the crank handle speed, the applied force
and determines the subjects heart rate by a chestbelt
transmitter. Additionally, the base control activates
the motor to adjust the tension of the belt, thereby
regulating the applied braking force. The force may
be automatically varied in response to changes in
crank handle speed to maintain a constant power
workload.
For information about how respective control unit
works, see section ”Connection to controller”.
Distance meter, Miles
Energy kcal
Heart rate beats/minute (bpm)
Force Newton (N), kp
Power Watts (W), kpm/min or
VO
2
ml/min/kg
Time min:sec
Weight kilogram (kg), pounds (lb)
Measured quantities
Power on crank or flywheel
When the Ergometer 831 E is adapted to ECG-work
tests, it is set to measure the power on the crank.
When the Ergometer 831 E is adapted to fitness tests,
it is set to measure the power on the flywheel.
Operating Instruction
Here are instructions for connections and opportunities
for connection to external communication. The need
for advanced technical documentation/protocols
for systems building, contact Monark Exercise AB,
Sweden.
The Monark Ergometer 831 E can be controlled
externally from a terminal, a computer or an ECG
device. A printer can also be connected to the
ergometer.
The control is performed over a serial line using ANSI/
ISO/ASCII format commands. The interface is a 9-pin
male D-sub connector, compatible with the RS232
standard, located on the front of the electronic box.
To connect to a PC use a 0-modem serial cable with
9-pin female connectors in both ends.
It is also possible to use an analogue control from an
external source to set the workload. This is done by
the contacts b32 and z32 on the main connector on
the bike.
The ergometer need not be turned off prior to
connection of the external components, although
removing the power from all devices may prevent
erroneous data transfer between equipment during
interconnection. Caution must be exercised in the
connection of various types of equipment from
different manufactures to avoid electrical hazards and
physical damage. The user must be certain that the
instrument connector and the cable are designed for
the intended purpose. Serious injury to the user and/
or equipment may result if inappropriate connections
are attempted.