Crowcon Gasmaster 4 Instrucciones de instalación, puesta en marcha y mantenimiento - Página 3
Navegue en línea o descargue pdf Instrucciones de instalación, puesta en marcha y mantenimiento para Control Panel Crowcon Gasmaster 4. Crowcon Gasmaster 4 5 páginas. Accessory enclosure
Imprimir página2. Commissioning
The following procedures should be repeated for each detector connected to the Accessory
Enclosure.
1. When the detector has been connected, ensure that the 'Head Volt' potentiometer VR5
(see figure 3) on the amplifier PCB is set to its fully clockwise position (a clicking sound will
be heard when the potentiometer travel is at its limit). This will ensure excessive voltage is
not applied to the detector when power is applied.
2. Connect the Accessory Enclosure lead to the Gasmaster panel and apply power.
3. Access the detector and measure the voltage between the '+' and '-' terminals, adjust VR5
on the amplifier PCB until 2Vdc +/- 0.1Vdc is obtained at the detector.
4. Leave the sensor to stabilise for 1 hour.
5. The amplifier must be balanced to achieve correct operation. Connect a volt meter set to
the mV range to test points T1 (see figure 3), and adjust VR4 until the meter reads
'0.00mV'. Re-connect the test leads to test points TP3 and TP4 and adjust VR3 until the
meter reads '0.00mV'. the detector and amplifier are now balanced
Zeroing the detector
6. Connect a volt meter to the test points marked 'TP1' and 'TP2' (see figure 3). Ensure the
detector is in clean air and adjust the potentiometer marked ZERO (VR1) so that the
meter reads 40mV. Check the Gasmaster channel display reads zero, if adjustment is
required follow the instructions given in the Gasmaster manual.
Calibrating the detector (ensure the Gasmaster is inhibited prior to calibration to prevent
false alarms and/or shutdowns).
7. With the volt meter still connected to the test points marked 'TP1' and 'TP2' and apply 50%
LEL calibration gas to the detector at a flow rate of 0.5 to 1 litre per minute. Allow the gas
reading to stabilise (usually 30 to 60 seconds) and adjust the potentiometer marked CAL
(VR2) so that the meter reads 120mV. Check that the Gasmaster display reads 50% LEL, if
adjustment is required follow the instructions given in the Gasmaster manual. Remove the
gas and ensure the reading returns to zero.
Note: If the gas reading appears to go negative when gas is applied it is highly likely that the
detector '+' and '-' connections are inverted. Reverse the connections and re-balance, zero and
calibrate the detector. Once calibration is complete on all sensors the Accessory Box can be
closed and the Gasmaster should be taken out of inhibit state.
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-
SIG
+
Detector terminals
TP2
TP4
ZERO
VR3
TP3
CAL
VR4
T1
Figure 3 Amplifier PCB Layout
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Terminals to Gasmaster
Sink/Source links
TP1
(set to SINK)
VR5