Signal; Caution On Use Harc70-Ce1 (Op) - Hitachi SAMURAI Series Manual

6.6.2. Signal

Control Operation
State Monitoring

6.6.3. Caution on use HARC70-CE1 (op)

Please use it correctly according to the following "CAUTION ON USE."
As for the following:
−
"HARC" indicate " HARC70-CE1" or "HARC70-CE1 OP"
−
"Monitoring Device " indicate " upper connecting device for supervise ", and "Control Panel" indicate "Control
panel of Chiller unit".
−
"SNVT" Indicate "Standard Network Variables Types"
1. Install HARC in a grounded metal box.
2. Install a short circuit breaker in the power supply of HARC.
3. The transmission line between HARC and Chiller unit should be "0.75mm2 twisted-Pair cable". If it is not used,
then it cannot communicate between HARC and Chiller unit, and it does not work properly.
4. After an abnormal transmitting occurs between HARC and Chiller unit, and Chiller unit stops, in the case of
operation starting by the hand operation, then once turn off Chiller unit's power supply, and turn on the power
supply. If it isn't carried out, then Chiller unit keeps the condition of transmission alarm.
5. After an abnormal transmitting occurs between HARC and Chiller unit, and Chiller unit stops, in the case of
operation starting by Monitoring Device, then transmit an operation order after you transmit a stop order once. If
it isn't carried out, it can't start.
6. After Chiller unit, under control by HARC, is stopped by the control panel, and operation is done from the
Monitoring Device, then transmit an operation order after you transmit a stop order once. If it isn't carried out, it
can't start.
7. Don't set the setting temperature to Chiller unit, under control by HARC, by the control panel. If it is done, the
setting temperature is changed. And, as for the setting temperature, which changed in this case, transmit to
Monitoring device.
8. After the setting temperature is changed by Monitoring Device, in the case of turned off Chiller unit's power
supply, set the setting temperature by Monitoring device again. If it isn't carried out, then the setting temperature
becomes to the temperature by setting control panel.
9. If power failure occurs in Chiller unit, under control by HARC, it may not revert to the condition before the power
failure. Try to detect that the operation condition of Chiller unit changed, by the Monitoring Device. If Chiller unit
stopped due to the power failure, then transmit an operation order from the Monitoring Device after the power
supply restoration. And, transmit the setting temperature, mode from the Monitoring device. If it isn't carried out,
and then Chiller unit is stopping, and the setting temperature, mode is the initialisation value by Chiller unit.
10. When SNVT, which is transmitted from HARC, is used by other control device, premise that there is two minutes
delay between the transmitting SNVT and the movement Chiller unit . If it isn't premised, then a problem may
occurs in the control system.
TCGB0051 rev 0 - 09/2009
38
ON/OFF Chiller
Outlet Water Setting
ON/OFF
Chilled Water Outlet Setting
Chilled Water Outlet Temperature
Chilled Water Inlet Temperature.
Alarm Codes
Operation Status
Discharge Pressure 1,2
Suction Pressure 1,2
Discharge Temperature 1,2
Suction Temperature 1,2
Compressor Status (ON/OFF) 1,2
Outlet Water Temp. 1
Water Temp. In Evap. Backside 1
Installation
Technical Catalogue
All HARC'S
All HARC'S
All HARC'S
All HARC'S
All HARC'S
All HARC'S
All HARC'S
All HARC'S
Only HARC OP
Only HARC OP
Only HARC OP
Only HARC OP
Only HARC OP
Only HARC OP
Only HARC OP